Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Performance tuning, detonation issues, and proposed modifications for a high power cylinder head. | ||
| View original record | To E.P. c. to Hs/Rm. 1009 1129 Rm Hs/Wd.2/GB.2135. HIGH POWER HEAD. The tuning of the above head has been carried to a point at which we can show substantial gains in B.M.E.P. over the 'close-centres'… | ||
| scan0002 | Test results and further development of a high power cylinder head. | ||
| View original record | To Hs/Wd. Hs/Rm.16/KW.7.1.35. High Power Cylinder Head. The results obtained by this cylinder head seem to be very interesting. We do not like it being so critical to the ignition advance and would… | ||
| scan0003 | Results of a high power cylinder head and proposing new designs to improve flow and reduce detonation. | ||
| View original record | To E.S. c. to Hs/Rm. 1129 Hs/Wd.4/GB.8.1.35. HIGH POWER HEAD. The initial results on this head are very promising, now that the exhaust valve has been increased in diameter, and suggest that the flow… | ||
| scan0004 | Development and testing of a high power single cylinder head. | ||
| View original record | To Hs/Wd. [handwritten] 1129 [/handwritten] Hs/Rm.4/KW.19.3.35. Single Cylinder Work - High Power Head. Confirming our conversation on this unit, we think that the results obtained so far are… | ||
| scan0005 | Technical paper discussing combustion roughness in side-valve engines, focusing on detonation, pressure rise, and flame front characteristics. | ||
| View original record | 4005 1129 E/PSN.1/MN.19.3.35. To. [REDACTED] Copy to Mr. [REDACTED] Hs/Rm. Rm COMBUSTION ROUGHNESS. A great deal of work has been done in America in recent years on the investigation of the… | ||
| scan0006 | The design and performance of different cylinder heads and combustion chambers. | ||
| View original record | -2- possible to pick out potentially smooth and potentially rough combustion chambers from a series by using these curves. Attached are such curves plotted for the standard Bentley and Ramp Cylinder… | ||
| scan0007 | Comparison of inlet valve to piston area ratios for various eight-cylinder high power engine heads. | ||
| View original record | To Hs/Rn: 1129 Hs/Smth.14/KW.11.5.35. EIGHT CYLINDER HIGH POWER HEAD ENGINE. Below are values of the factor inlet valve area / piston area for various heads. [TABLE START] Head | No. of Inlet Valves |… | ||
| scan0008 | Technical memorandum discussing engine design considerations for cylinder grouping, camshafts, and valve tappets. | ||
| View original record | -2- Hs/Smth.14/KW.11.5.35. The shortest engine is obtained by grouping the cylinders in pairs with a common combustion chamber wall. This arrangement is also the best for the provision of camshaft… | ||
| scan0009 | Technical considerations for a 4.5 litre, 8-cylinder engine, comparing different configurations and materials. | ||
| View original record | -3- Hs/Smth.14/KW.11.5.35. Whether we use 2 inlet tappets or not, the inertia of the exhaust valve gear will mean that we must regard 5,500 as the max. permissible r.p.m. which would be given by an… | ||
| scan0010 | Optimal angle and placement of a spark plug for improved engine performance. | ||
| View original record | -4- Hs/Smth.14/KW.11.5.35. In order to miss the rocker cover and yet run into the combustion chamber near the throat (as has been found necessary on the single cylinder unit), the sparking plug will… | ||
| scan0011 | Comparing inlet valve to piston area ratios across various engine cylinder heads. | ||
| View original record | To Wd. from Hs/Smth. Hs/Smth.15/KW.26.4.35. Cylinder Heads for Car Engines. --------------------------- On looking into the question of the best cylinder head for future engines, we find the values of… | ||
| scan0012 | Limitations and alternatives for cylinder head designs, including pent-house and ramp heads. | ||
| View original record | -2- Hs/Smth.15/KW. 26.4.35. With the standard head, 1.500" is probably the useful limit to the inlet valve diameter. A pent house head would require two camshafts to allow access to the central… | ||
| scan0013 | Experimental department report on a High Power Head for a Bentley. | ||
| View original record | X1P29 EXPERIMENTAL DEPARTMENT REPORT. REFERENCE :- Hs/Wd.2/GB.27.5.35. Subject of Report:- High Power Head. R L Smelt General Conclusions: This head shows a considerable improvement over the Standard… | ||
| scan0014 | The development and performance of a single cylinder Bentley unit with a high power head. | ||
| View original record | Hs/Wd.2/GB.27.5.35. SINGLE CYLINDER BENTLEY UNIT WITH HIGH POWER HEAD. Period covered by this report - 1st December 1934 to 16th May 1935. This engine has completed a further 89 hours 10 minutes… | ||
| scan0015 | Report comparing high power single and twin-inlet cylinder heads with a standard head, including a detailed table of specifications. | ||
| View original record | - 2 - Hs/Wd.2/GB.27.5.35. sodium cooled exhaust valve helps to subdue this high speed detonation and in the case of the twin-inlet head, prevents it occurring at all. RATE OF PRESSURE RISE. Indicator… | ||
| scan0016 | Technical analysis comparing a high-power cylinder head design with the standard Bentley head, focusing on power output and valve timing. | ||
| View original record | - 3 - The high power type cylinder and heads are entirely different in design from the standard Bentley (as will be seen on LeC's. 4075, 4123 and 4157) in that the combustion chamber is situated at… | ||
| scan0017 | Valve timing and detonation characteristics for high-power heads compared to standard Bentley heads. | ||
| View original record | - 4 - Hs/Wd.2/GB.27.5.35. above which speed the high power head leads. Sheet 6 shows a direct comparison, on the high power head, between the normal Bentley and the short duration timing (which has… | ||
| scan0018 | Analysis of engine detonation tests with various cylinder head, gasket, and valve modifications. | ||
| View original record | - 5 - on Sheet 7 of the curves. It will be seen from this curve that the high power head gives a maximum detonation of only 4 feet (at 1250 R.P.M.). By fitting a thinner cylinder head gasket (.022… | ||
| scan0019 | Analysis of engine performance relating to exhaust valves, ignition timing, pressure rise, and spark plug position. | ||
| View original record | - 6 - SODIUM COOLED EXHAUST VALVES. When reference is made to the above, a valve in which the stem only is sodium filled is indicated. Tests have been carried out with a fully cooled valve but as the… | ||
| scan0020 | Fuel consumption comparisons and mechanical failures including piston seizure, cracked valves, valve springs and push rods. | ||
| View original record | - 7 - Hs/Wd.2/GB.27.5.35. and a loss of power is experienced. If both plugs are in use, the power output is the same as with the better position only. FUEL CONSUMPTION. Comparing the High Power Head… | ||
| scan0021 | Future development plans for high-power cylinder heads. | ||
| View original record | - 8 - Hs/Wd.2/GB.27.5.35. FUTURE DEVELOPMENT. HIGH POWER HEADS. Tests will be carried out with a twin-inlet head in aluminium, to compare the effect on rate of pressure rise and detonation, with the… | ||
| scan0022 | Performance graph from Bentley single cylinder tests comparing the power output of different high-power cylinder heads. | ||
| View original record | V1744 BENTLEY SINGLE CYLINDER TESTS. SHEET 1 POWER OUTPUT - HIGH POWER HEADS. HIGH POWER CYLINDER & HEADS TO L&C 4075, 4123 & 4157 SODIUM COOLED EXHAUST VALVE 1.500" DIA. ZENITH CARBURETTOR (36%… | ||
| scan0023 | Graph plotting power output results from Bentley single cylinder tests on a twin inlet high power head. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 1A V1770 POWER OUTPUT - TWIN INLET HIGH POWER HEAD FOR CONDITIONS OF TEST SEE SHEET 1 COMPRESSION RATIO = 6.8 COMPRESSION RATIO = 6.13 BRAKE HORSE POWER B.M.E.P.… | ||
| scan0024 | Graph showing power variation, B.M.E.P., and fuel consumption against R.P.M. for a Bentley single-cylinder engine test with different choke sizes. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS. SHEET 2 POWER VARIATION WITH CHOKE SIZE (TWIN INLET HIGH POWER HEAD) HIGH POWER CYL. HEAD TO L.E.C. 4/23/57 TWO INLET VALVES 1.225 DIA EXHAUST VALVE 1.500 DIA.… | ||
| scan0025 | Graph showing power variation with choke size for a single inlet high power head engine during Bentley single cylinder tests. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 3 V1746 POWER VARIATION WITH CHOKE SIZE (SINGLE INLET HIGH POWER HEAD) HIGH POWER CYL. HEAD TO L C 4075 SINGLE INLET VALVE 1.750 DIA. EXHAUST VALVE 1.500 DIA.… | ||
| scan0026 | Graph showing power output results from Bentley single-cylinder engine tests comparing different configurations. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS. SHEET 4 V 1747 POWER OUTPUT WITH BENTLEY TIMING, (HIGH POWER HEAD) HIGH POWER CYLINDER & HEAD TO L.E.C. 4075 SINGLE INLET VALVE 1.750 DIA. ZENITH CARBURETTOR (36% CHOKE)… | ||
| scan0027 | Graph comparing power output, BMEP, and fuel consumption with an open exhaust versus a fitted car silencer during single-cylinder engine tests. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS. SHEET 5 V1748. POWER OUTPUT: EFFECT OF SILENCER, (HIGH POWER HEAD). HIGH POWER CYLINDER & HEAD TO LEC. 4075. SINGLE INLET VALVE 1.750" DIA EXHAUST VALVE 1.500" DIA… | ||
| scan0028 | Graph comparing power and BMEP against RPM for short duration versus normal Bentley valve timings on a single cylinder engine. | ||
| View original record | V1749. BENTLEY SINGLE CYLINDER TESTS SHEET 6 POWER COMPARISON WITH SHORT DURn & NORMAL TIMINGS HIGH POWER CYLINDER & HEAD TO LEC 4075 SINGLE INLET VALVE 1.750" DIA EXHAUST VALVE 1.500" DIA COMPRESSION… | ||
| scan0029 | Performance graph from Bentley single-cylinder engine tests, charting detonation and BMEP against RPM for a twin-inlet high-power head. | ||
| View original record | V1750. BENTLEY SINGLE CYLINDER TESTS SHEET 7. DETONATION TESTS. TWIN INLET HIGH POWER HEAD HIGH POWER CYLINDER HEAD TO L & C 4123/57 TWO INLET VALVES | .225 DIA. EXHAUST VALVE | .500 DIA. ZENITH… | ||
| scan0030 | Graph plotting the results of detonation tests on a single inlet high power cylinder head with various configurations. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 8. V1751. DETONATION TESTS: SINGLE INLET HIGH POWER HEAD HIGH POWER CYLINDER HEAD TO I.E.C. 4075. FLAT HEADED INLET VALVE 1.750" DIA. EXHAUST VALVE 1.500 DIA.… | ||
| scan0031 | Graph plotting the results of Bentley single-cylinder detonation tests, showing the effect of a sodium-cooled exhaust valve. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 9 V1752. DETONATION TESTS. EFFECT OF SODIUM COOLED EXHAUST VALVE. HIGH POWER CYLINDER HEAD TO L/E C 4075 FLAT HEADED INLET VALVE 1.750 DIA (FLUSH WITH CYL. HD.)… | ||
| scan0032 | Graph showing detonation tests comparing different types of inlet valves. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 10. V1753. DETONATION TESTS: COMPARISON OF TYPES OF INLET VALVES HIGH POWER CYLINDER & HEADS TO L.E.C. 4075, 4123 & 4157. EXHAUST VALVE = 1.500 DIA. (UNCOOLED)… | ||
| scan0033 | Blueprint graph showing ignition advance curves for high power heads during Bentley single cylinder tests. | ||
| View original record | BENTLEY SINGLE CYLINDER TESTS SHEET 11 V 1755 IGNITION ADVANCE CURVES - HIGH POWER HEADS. HIGH POWER CYLINDER & HEADS TO L.C's 4075, 4125, 4157 SODIUM COOLED EXHAUST VALVE ZENITH CARBURETTOR (36 M/M… | ||
| scan0034 | Indicator diagram plotting cylinder pressure against crank angle for a single-cylinder test. | ||
| View original record | SHEET 12 INDICATOR DIAGRAM No B14. CYLINDER HEAD TO Ls C 4/23/57 TWIN INLET VALVES. COMPRESSION RATIO = 6.13 ZENITH CARBURETTOR (36 m/m CHOKE) OPEN EXHAUST FUEL = No 1 SHELL BAR = 732 m/m TEMP = 10°c… | ||
| scan0035 | Report comparing engine head and valve arrangements, including sleeve valves and a 24-cylinder engine design. | ||
| View original record | X1179 To Sg. and Wor. Rg. Hs. Ey. Hs/Lr. Hs/Wd. E/Rbr. E.2/HP.31.5.35. ENGINE DATA. The attached report - E/PSN.2/MN.30.5.35 draws highly interesting and very important comparisons between the various… | ||
| scan0036 | The measurement and comparison of engine breathing capacity. | ||
| View original record | E/PSN.2/MN.30.5.35. Engine Breathing Capacity. ------------------------ The maximum power that can be obtained from an engine naturally aspirated or the boost necessary to give a required m.e.p. on a… | ||
| scan0037 | Comparison of Pegasus and Kestrel engine performance focusing on valve timing and port contours. | ||
| View original record | -2- off with 8" of boost. This latter figure is very disturbing and indicates that if we are to run our engine at much higher speeds a big improvement in the orifice coefficient of our valving will be… | ||
| scan0038 | Analysis of engine performance focusing on exhaust valving and comparing Bentley and Kestrel Ramp head designs. | ||
| View original record | -3- The losses due to such edges increase rapidly at high velocities and charge densities, and we propose to try a modification which will eliminate such edges on our own ports. A Ramp Head with inlet… | ||
| scan0039 | Comparison of sleeve valve and poppet valve engines, with a discussion on steel penthouse heads. | ||
| View original record | -4- E/PSN.2/MN.30.5.35. (3) Sleeve and Poppet Valve Engines. Generally speaking it does not appear that the sleeve valve engine has much advantage in port area over the poppet valve engine, but it… | ||
| scan0040 | Technical comparison of various engine cylinder head designs, including Ramp, Penthouse, Kestrel, and Bentley types. | ||
| View original record | -5- E/PSN.2/MN.30.5.35. the results do not show the improved breathing capacity which would be anticipated but this may have been due to the timing which was the same as for the Ramp Head and probably… | ||
| scan0041 | Comparative table of various engine specifications, including cylinder head types, dimensions, port areas, mean effective pressures, and RPM. | ||
| View original record | [COLUMN HEADERS] ENGINE, CYLINDER HEAD, PISTON DIAMETER, VALVE OR PORT AREA, RATIO PORT AREA PISTON AREA, M.E.P.S. (at 2500, 2750, 3000 FT/MIN with N.A. [BMEP, IMEP] and 8" BOOST sub-columns), R.P.M… | ||
| scan0042 | Value and continuation of single-cylinder research work on car engines. | ||
| View original record | To E. & Hs/Wd. c. to Hs. c. to RHC. X1129 HS/Rm.15/KW.18.7.35. Single Cylinder Work on Car Engines. We have always been enthusiastic about single cylinder car work as a means of helping design to… | ||
| scan0043 | Specification table outlining the ideal requirements for valve gear and combustion chamber design. | ||
| View original record | -2- HE/Rm.15/KW.18.7.35. REQUIREMENT. | SPECIFICATION OF THE IDEAL. ---|--- Silence. | The valve gear should permit of valve silence being obtained at all times without the necessity of complicated… | ||
| scan0044 | Review and opinion on the potential of a high-power cylinder head design compared to alternatives. | ||
| View original record | -3- EB/Ru.15/KW.18.7.35. Bearing these in mind, we review the present position as follows :- High Power Head. We were probably more enthusiastic than anyone else with regard to the potentialities of… | ||
| scan0045 | Report discussing the merits and drawbacks of Sleeve Valve and Overhead Camshaft engine designs for an in-line car. | ||
| View original record | -4- HS/Rm.15/KW.18.7.35. Sleeve Valve Unit. In HS/Rm.8/KW.1.2.35. we suggested that it was worth while investigating the sleeve valve in relation to an in-line car engine. As no-one appears to have… | ||
| scan0046 | The merits and drawbacks of an overhead camshaft engine design compared to existing push-rod engines. | ||
| View original record | -5- HS/Rm.15/KW.18.7.35. Overhead Camshaft Engine. Cont'd. Some experiments we have done, the details of which are given in Hs/Smth.10/KW.4.7.35, show that there is no reason, apart from the drive,… | ||
| scan0047 | The development and merits of side valve engines compared to overhead valve engines, referencing American automotive trends. | ||
| View original record | -6- Side Valve Unit. Two years ago, when I was in America, Janeway was saying that side valves were so bad for breathing that American manufacturers would shortly be forced to overhead valves. His… | ||
| scan0048 | High power engine head design, focusing on valving, power output, and valve gear configuration. | ||
| View original record | 1179 HB/Smth.20/KW.15.7.35. High Power Head Engine. Valving and Power Output. The value of Inlet Valve Area / Piston Area attainable with a high power head is .280 for single inlet valves and .270 for… | ||
| scan0049 | Engine size comparisons and potential performance issues for 6 and 8-cylinder engines. | ||
| View original record | -2- Hs/Bmth.20/KW.15.7.35. Engine Size. The minimum lengths of a 6-cylinder, 3.5 bore and an 8-cylinder 3.125 bore engine are shown in the attached figure. These are obtained by grouping the… | ||
| scan0050 | Blueprint comparing the lengths of 6-cylinder and 8-cylinder high power head engines. | ||
| View original record | I E E I I E E I CAMSHAFT BEARINGS LENGTH OF 6 CYL. x 3.5 BORE = 27.5 LENGTH OF 8 CYL. x 3.125 BORE = 32.0 LENGTH OF HIGH POWER HEAD ENGINE. ROLLS-ROYCE, LTD PRINT ROOM AUG 7 1935 DERBY Hs.2068 | ||
| scan0051 | Experimental department report concerning air flow through inlet valves. | ||
| View original record | X1129 EXPERIMENTAL DEPARTMENT REPORT. REFERENCE :- Hs/Wd.1/GB.30.10.35. Subject of Report:- Air Flow through Inlet Valves. General Conclusions : Air flow coefficients are given for inlet valves tested… | ||
| scan0052 | Blowing tests to determine the effect of port shape on airflow through inlet valves. | ||
| View original record | AIR FLOW THROUGH INLET VALVES. It is generally realised that the air flow through an inlet port is governed by the valve diameter at small lifts but that at high lifts the shape of the port and the… | ||
| scan0053 | Valve lift coefficients and port shape effects for Kestrel, Merlin, and car size cylinders. | ||
| View original record | - 2 - CURVES 11, 111 & 1V give the coefficients at various valve lifts for Kestrel, Merlin and car size cylinders respectively. In these curves the effect of the port shape can be seen, for instance,… | ||
| scan0054 | Comparative analysis table of various engine cylinder heads with performance metrics and a brief conclusion. | ||
| View original record | - 3 - Hs/Wd.1/GB.30.10.35. CYLINDER. | Drg. | Valve dia. | RPM. Factor. | Piston Speed Factor. ------------------------------------------------------------------------ Kestrel .......... E.40267 |… | ||
| scan0055 | Analysis of how pressure drop at engine inlet valves reduces power. | ||
| View original record | - 4 - Hs/Wd.1/GB.30.10.35. APPLICATION OF RESULTS. The pressure drop at the inlet valves of an engine reduces the power in four ways. - (a) The friction of the air passing through the valves during… | ||
| scan0056 | The ramming effect in induction systems, detailing volumetric efficiency and power increases on the Kestrel cylinder. | ||
| View original record | - 5 - Hs/Wd.1/GB.30.10.35. (e) The ramming effect depends very much on the induction system and with perfect valves a volumetric efficiency of 200% can be obtained; actually with the Kestrel cylinder… | ||
| scan0057 | Graph of Inlet Valve Discharge Coefficients showing the variation with valve diameter at a constant lift of 0.2 inches. | ||
| View original record | FIG. 1 AIR BLOWING RIG. Nº 4 BED. INLET VALVE DISCHARGE COEFFICIENTS. VARIATION WITH VALVE DIAMETER AT CONSTANT LIFT OF 0.2". DISCHARGE COEFFICIENT K 10 20 30 40 50 VALVE DIA INCHES 0 1.0 2.0 R.W.C.… | ||
| scan0058 | Graph of inlet valve discharge coefficients versus valve lift for Kestrel size cylinders on an air blowing rig. | ||
| View original record | FIG II AIR BLOWING RIG Nº 4 BED INLET VALVE DISCHARGE COEFFICIENTS. KESTREL SIZE CYLINDERS. DISCHARGE = K * sqrt((Pd x P) / T) lbs/MIN. Pd = "Hg PRESSURE DROP AT VALVE P = "Hg PRESSURE IN CYLINDER T =… | ||
| scan0059 | Graph of inlet valve discharge coefficients for PV12 size cylinders on an air blowing rig. | ||
| View original record | FIG III AIR BLOWING RIG N° 4 BED INLET VALVE DISCHARGE COEFFICIENTS PV12 SIZE CYLINDERS DISCHARGE COEFFICIENT K 100 80 60 40 20 0 VALVE LIFT : INCHES. 0.1 0.2 0.3 0.4 0.5 0.6 NORMAL VALVE LIFT INLET… | ||
| scan0060 | Graph of inlet valve discharge coefficients versus valve lift for car size cylinders on an air blowing rig. | ||
| View original record | FIG IV AIR BLOWING RIG Nº4 BED INLET VALVE DISCHARGE COEFFICIENTS CAR SIZE CYLINDERS DISCHARGE COEFFICIENT K 50 40 30 20 10 0 NORMAL VALVE LIFT RAMP II 1.6" HIGH POWER I RAMP I RUDGE (2 VALVES) VALVE… | ||
| scan0061 | Summary of performance characteristics for a high-power cylinder head, detailing power gains, detonation issues, and smoothness. | ||
| View original record | x1129 July 1936 High Power Head. Before criticising and commenting on this head, a brief summary of the position up to date would probably be of value. Power. The head has been run on the single… | ||
| scan0062 | Design analysis of a Chevrolet-style cylinder head and a High Power Main Engine, discussing combustion, valving, and valve gear. | ||
| View original record | -2- A mathematical investigation was carried out with this plug position after the style of Chevrolet's to see whether or not this combustion chamber had any potential qualities of smoothness, and the… | ||
| scan0063 | Engine head modifications to cure detonation, considering valve types, head angles, and materials. | ||
| View original record | -3- On considering the subject, it would appear that, if the detonation trouble can be cured, the single inlet valve is the most suitable, as there will then only be one push rod, and automatic… | ||
| scan0064 | Comparison of M.E.P. gains and power gains between various Bentley engine cylinder heads at different RPMs. | ||
| View original record | -4- A second comparison is given in Fig.IV. This shows the standard small bore Bentley head EB.615 against its exact equivalent on the single cylinder unit, with a third curve showing the approximate… | ||
| scan0065 | Concluding summary on the practical difficulties and future research related to incorporating a twin inlet valve head in an engine. | ||
| View original record | -5- Summarising the position, we see that there are practical difficulties in the way of incorporating a twin inlet valve head in the main engine, and further research will have to be done on a single… | ||
| scan0066 | Blueprint graph of smoothness curves and flame travel analysis for a turbulent high power head. | ||
| View original record | HIGH POWER HEAD FIG I SMOOTHNESS CURVES FOR TURBULENT HIGH POWER HEAD PLUG POSITION: IMMEDIATELY OVER EXHAUST VALVE RATIO % VOLUME INCREASE / % TRAVEL INCREASE % FLAME VOLUME % FLAME TRAVEL J.L.E. | ||
| scan0067 | Comparison of 'High Power' and 'Chevrolet' cylinder heads, showing valve sizes and cross-sectional diagrams. | ||
| View original record | High Power Head FIG. II COMPARISON OF HIGH POWER AND CHEVROLET HEADS VALVE SIZES CHEV. HIGH POWER INLET 1.15" 1.75" EXHAUST 1.25" 1.50" CHEVROLET INLET EXHAUST HIGH POWER ALTERNATIVE PLUG POSITION… | ||
| scan0068 | Graph comparing the power output and B.M.E.P. of different High Power Bentley cylinder heads. | ||
| View original record | HIGH POWER BENTLEY Fig. III. POWER COMPARISON OF HIGH POWER BENTLEY HEADS CYLINDER HEADS:- STD. BENT. E.B. 2560; T.T. BENT. Ex. 22594 HIGH POWER S/C, L.E.C. 4123 VALVE TIMING:- STD. BENTLEY TIMING FOR… | ||
| scan0069 | Graph comparing the performance of a single-cylinder unit against a main engine. | ||
| View original record | BENTLEY FIG. IV COMPARISON OF SINGLE CYLINDER UNIT & MAIN ENGINE CYLINDER HEADS:- STANDARD BENTLEY E.B. 615 & E.B. 1517 VALVE TIMING:- I.O. 4°E ; I.C. 51°L ; E.O. 51°E ; E.C. 7°L C.R. = 6.4 OPEN… | ||
| scan0070 | Merits and demerits of single-cylinder engine work versus full-scale testing for future engine design. | ||
| View original record | To H. c. to Sg. c. to Wor. c. to By. Rs/Rm.25/KW.1.9.36. Car Future Engine Design - Single Cylinder Work. We have now had about two years' experience of single cylinder car work. We have come to the… | ||
| scan0071 | Engine power output, weight, and reliability for 6-cylinder power units. | ||
| View original record | -2- Hs/Rm.25/KW.1.9.36. (1) Power Output. With our 4¼ 6-cylinder power units we have reached the limit of valve size and valve port which we can employ without lengthening the engine. The valve size… | ||
| scan0072 | Technical memorandum discussing the comparative merits of engine designs regarding cost, silence, smoothness, and slow running. | ||
| View original record | -3- (4) Cost. The present cylinder head casting is a difficult foundry job. Taub, chief engineer of Chevrolets, was astonished at the high degree of accuracy called for. In a very small space six… | ||
| scan0073 | Analysis of the disadvantages of side valve exhaust engine construction and consideration of future engine designs. | ||
| View original record | -4- Hs/Rm.25/KW.1.9.36. The disadvantages of the construction are :- (1) The side valve exhaust valve may tend to cause cylinder distortion. This should not be appreciably worse than the ordinary side… | ||
| scan0074 | Summary comparing the existing push-rod overhead valve engine with a proposed 6-cylinder overhead camshaft design for future chassis. | ||
| View original record | -5- Summary. For fifteen years we have been using the existing push rod type of overhead valve engine exclusively in our chassis. It has served us exceedingly well and may do so for some time to come.… | ||
| scan0075 | Performance graph detailing the cylinder head development for a 4 1/4 Litre Bentley engine. | ||
| View original record | 4 1/4 LITRE BENTLEY CYLINDER HEAD DEVELOPMENT POWER BOX 1: C/R 6.5:1 EX 22594 IN. VALVE 1.700 EX. VALVE 1.350 IN PORT 1.625 VALVE TIMING A BOX 2: C/R 6.5:1 LEC 4123 IN. VALVE 1.750 EX. VALVE 1.500 IN… | ||
| scan0076 | Development of a high power single-cylinder head, including part modifications and new instructions. | ||
| View original record | To RHC. X1129 E/PSN.1/MN.1.9.36. Copy to Hs/Rm. Ds. BY Hs/Edwards EDWARDS See me Rm. ------------------------------------------------ Car Universal Single Cylinder Unit. High Power Head Development.… | ||
| scan0077 | Failed exhaust valve on a Phantom III cylinder head and the supply of prints for a modified replacement. | ||
| View original record | To RHC. Copy to Hs/Rm. Ba. BY. Hs/Edwards. X1129 E/PSN.3/MN.2.9.36. Edwards. See me Rm Car Universal Single Cylinder Unit. Phantom III Cylinder Head. We find that the exhaust valve which failed on the… | ||
| scan0078 | Modified sparking plug inclination for a single-cylinder, high-power head. | ||
| View original record | X 1129 To RHC. Copy to Hs/Rm. NY. [Strikethrough] Ba. [Strikethrough] Hs/Edwards. ---------------- E/PSN.1/MN.5.9.36. ---------------- Car Universal Single Cyl. Unit. Single Inlet Valve High Power… | ||
| scan0079 | Future car engine design, focusing on single-cylinder development work. | ||
| View original record | [Handwritten] #illegible crossed out text# 1260 EDWARDS. [Handwritten] XII-29 (P) Hs/Rm. from E. ----------------- c. Sg. Wor. By. ----------------- E.1/HP.3.10.36. Car Future Engine Design - Single… | ||
| scan0080 | Engine cylinder head design, detonation issues, and potential improvements including valve and camshaft design. | ||
| View original record | - sheet 2 - We have a drawing of a modified cylinder block in hand for this purpose. Referring back again to the lack of smoothness associated with the high power head, it is found that the exhaust… | ||
| scan0081 | Page discussing the testing of a high-power head, dry liner aluminium block, and combustion chamber development. | ||
| View original record | (sheet 3) to testing the high power head on the lines indicated namely, the dry liner aluminium block construction, and the development of a combustion chamber which will operate smoothly and without… | ||
| scan0082 | Details for manufacturing a High Power Single Inlet Valve Head in aluminium instead of cast iron. | ||
| View original record | To RHC. Copy Hs/Rm. Da: BY Hs/Edwards. X1129 E/PSN.1/MN.15.10.36. CAR UNIVERSAL UNIT. High Power Single Inlet Valve Head. We send you herewith the following details for making a High Power Head in… | ||
| scan0083 | Machining of a spare cylinder block and the provision of prints for exhaust valves. | ||
| View original record | To RHC. Copy to EV. Hs/Rm. Ser. Hs/Edwards. X11-29 E/PSN.2/MN.9.10.36. SMALL UNIVERSAL UNIT. Cylinder Block with Large Exhaust Valve for High Power Head Further to our memo. E/PSN.2/MN.7.10.36 in… | ||
| scan0084 | Request to complete a modified cylinder block for a high power head on a small universal unit. | ||
| View original record | X1129 E/PSN.2/MN.7.10.36. To RHC. [struck through] Copy to EH. [struck through] Hs/Rm. Da. Hs/Edwards. [handwritten and struck through] SMALL UNIVERSAL UNIT. Cylinder Block for High Power Head. At the… | ||
| scan0085 | Incorrect obsolete inlet valve springs being fitted to a high power cylinder head. | ||
| View original record | X1129 To RHC. Copy to Hs/Rm. Da. BY. Hs/Edwards. E/PSN.1/MN.16.10.36. CAR UNIVERSAL UNIT. High Power Head. As a result of complaints of inlet valve bounce on the above cylinder head we checked over… | ||
| scan0086 | Aluminium cylinder block with a dry liner for a high power head, including modifications and attached prints. | ||
| View original record | 1129 To RHC. Copy to Rm. EY. [crossed out] DR. [crossed out] For Edwards. E/PSN.1/WN.28.10.36. Handwritten: Edwards Please ask R.H.C to supply two off, follow up. Let me know if parts are not going… | ||
| scan0087 | Letter to Coventry Climax Engine Co. Ltd. proposing a discussion about a single-cylinder research engine. | ||
| View original record | Copy to EY Hs/Rm. Da. RHC. Mx. x 1129 EDWARDS You should go on this job Rm E/PSN.2/MN. 19th. October,1936. The Chief Engineer, Messrs.Coventry Climax Engine Co.Ltd., Friar's Road, Coventry. Dear Sir,… | ||
| scan0088 | Addition of a coolant jet to the cylinder block for the Car Universal Unit with a high power head. | ||
| View original record | To RHC. Copy to Rm. Rm/Edwards. X1129 E/PSN.4/MN.3.11.36. CAR UNIVERSAL UNIT. Cylinder Block for High Power Head. We send you herewith a print of LeC.5362 of the addition of a coolant jet to the… | ||
| scan0089 | The replacement of an exhaust valve for a high power head cylinder block, including material and dimensional changes. | ||
| View original record | To RHC. Copy to Rm. BY. Rm/Edwards. X1179 E/PSN.3/MN.3.11.36. CAR UNIVERSAL UNIT. Exhaust Valve for High Power Head Cylinder Block. We send you herewith a print of RS.340 of a 1 1/2" diameter exhaust… | ||
| scan0090 | Visit to Coventry Climax Engines Ltd. to discuss the O.H.1 engine design, covering cylinder head form, plug position, and throat size. | ||
| View original record | FILE, IVOT SENT OUT. 1129 9.11.36. COVENTRY CLIMAX ENGINES LTD. On the 5th inst. a visit was paid by the writer and Mr. Pearson of the Design Dept. to the above firm for the purpose of discussing the… | ||
| scan0091 | Comparative analysis of engine design features, including valves, temperatures, ignition, and cooling, with reference to Coventry Climax engines. | ||
| View original record | -2- Valve Sizes and Gas Velocities. Coventry Climax have done very little in the way of valve sizes, due to the fact that they had not tumbled to the necessity of shortening the duration when using… | ||
| scan0092 | Engine development issues concerning gaskets, inlet valve height, induction passages, and tests on an 8:1 compression ratio engine. | ||
| View original record | -3- Gaskets. In the early stages of the development of this engine trouble, due to detonation and plug overheating, was experienced. This was ultimately traced to the use of a C and A gasket which is… | ||
| scan0093 | Poor car performance, cylinder head material considerations, and patent litigation concerning O.H.1 type engines. | ||
| View original record | -4- The car in itself was very poor, on breaking hard from 70 m.p.h. the front wheels did everything conceivable and the car, one would imagine, became almost uncontrollable. Suspension also was poor… | ||
| scan0094 | Modifications to a high-power cylinder head and block, including a list of required parts. | ||
| View original record | 1129 To RMC. Copy to Rm. Da Rm/Edwards. E/PSN/AHF.1/MN.10.11.36. HIGH POWER HEAD & BLOCK IN A/C. Car Universal Unit - LeC.5328. We are reissuing herewith two prints of RS.332, Cylinder block in A/C,… | ||
| scan0095 | Visit to Coventry Climax Engine Co. regarding high power cylinder head design. | ||
| View original record | 8129 To E. Copy to Hs. Rm. Dr. BY Rm/Edwards. E/PSN.2/MN.11.11.36. Visit to Messrs.Coventry Climax Engine Co., Coventry on Nov. 5th..1936. FIRM The writer and Rm/Edwards paid a visit to the above with… | ||
| scan0096 | Cylinder head design, combustion chamber characteristics, and engine performance tests. | ||
| View original record | -2- With regard to head shape and plug position they are sending us drawings of their latest cylinder heads. In general the throat shape is somewhat similar to that on our head but the combustion… | ||
| scan0097 | The performance figures and design of a four-cylinder Skinner engine tested by Coventry Climax. | ||
| View original record | -3- We had some discussion with Mr. W.Kasten who is the Skinner representative in this country, and were also shown some parts of the 12 H.P. Skinner engine which Coventry Climax are building. They… | ||
| scan0098 | The supply of prints for a larger inlet valve (RS.317) for a High Power Head universal unit. | ||
| View original record | To HHC. Copy to Rm. BY. Da. Rm Edwards. --------------------- High Power Head. - Car Universal Unit. 1.850" diameter inlet valve. We send you herewith two prints of RS.317 - Inlet Valve - 1.850"… | ||
| scan0099 | Investigation into throat areas on high power cylinder heads to explain performance differences. | ||
| View original record | To Rm. Copy to Da. Rm/Edwards. E/PSN.1/MN.8.12.36. 1129 Throat Areas on High Power Heads. We send you herewith a print of LeC.5422 showing the throat areas on the various overhead inlet and side… | ||
| scan0100 | Design of an inclined inlet valve high-power cylinder head for a single-cylinder unit. | ||
| View original record | URGENT 429 To BY. E/PSN.3/MN.19.11.36. Copy to RHC. Rm. De. Rm.Edwards. CAR UNIVERSAL SINGLE CYLINDER UNIT. Inclined Inlet Valve High Power Head. We send you herewith Lec.5368 of an inclined inlet… | ||
| scan0101 | Modifications to the cylinder block, piston, and inlet valve dimensions. | ||
| View original record | -2- In order to avoid re-studding the cylinder block distance pieces are required to make up the height of three of the stud bosses. The inlet valve cannot be opened appreciably earlier than on the… | ||
| scan0102 | Cover note for a table on the cost and weight of units, detailing potential cost increases for alternative casting methods. | ||
| View original record | 12.2.37. COST AND WEIGHT OF VARIOUS UNITS. The att ched table shows comparative figures for units exclusive of gearboxes and clutch casings. If it is found impossible to die cast c/c top halves, but… | ||
| scan0103 | Comparative table of five different engine construction types, analyzing weight, cost, and design remarks. | ||
| View original record | COMPARED TO PRESENT PRODN. TYPE (1) PRESENT CONSTRUCTION, BUT USING DIE CASTINGS IN Z3 ALLOY FOR ALL ALUM: PIECES INCLUDING C/C TOP HALF. (2) WET LINER, INTEGRAL ALUM CONSTRUCTION, ALUM HEAD. ALL DIE… | ||
| scan0104 | Progress memo on the development of an overhead inlet side valve exhaust unit, detailing issues and findings. | ||
| View original record | 1129. Sg. from Rm. Hs. c. to E. c. to By. OVERHEAD INLET SIDE VALVE EXHAUST UNIT. Since Hs/Rm.25/KW.1.9.36. work has been continuing on this unit. Taking the four faults enumerated in the previous… | ||
| scan0105 | The pros and cons of a monobloc engine design with a cast iron crankcase and an aluminium head. | ||
| View original record | -2- (1) If we make it with a monobloc cast iron crankcase and cylinder, and aluminium head, it has the cast iron where it is most needed for rigidity, and the aluminium where it is most needed for… | ||
| scan0106 | Difficulties with an O.H.V. unit and the potential move to 12-cylinder or Vee-type engines. | ||
| View original record | -3- Rm.4/AP.16.2.37. with a short engine and simple foundry practice. The O.H.V. unit has already indicated that, with the valving obtained, it is going to be exceedingly difficult to obtain a… | ||
| scan0107 | Power output tests of a High Power Head for a Bentley engine, comparing results and showing percentage gains. | ||
| View original record | Rm from Rm/Ed. Rm/Ed/M.16.2.37. Power Output of High Power Head. Power tests have been carried out on the standard small bore S/C Bentley and the High Power Head in an attempt to line up with results… | ||
| scan0108 | Performance graph comparing a high power head against a standard 3 1/2 litre Bentley engine on a water brake dynamometer. | ||
| View original record | BENTLEY S/C UNIT COMPARISON OF HIGH POWER HEAD LEC 4075 AND STD BENTLEY FIG I ON H AND F WATER BRAKE ① HIGH POWER HEAD INLET VALVE 1.750" DIA ② STANDARD 3 1/2 LITRE BENTLEY INLET VALVE 1.700" DIA… | ||
| scan0109 | Dynamometer graph comparing a high power head against a standard 3 1/2 litre Bentley engine. | ||
| View original record | BENTLEY S/C UNIT COMPARISON OF HIGH POWER HEAD LEC 4075 AND STD BENTLEY ON ELECTRIC DYNAMOMETERS FIG II ① HIGH POWER HEAD INLET VALVE 1.750" DIA ② STANDARD 3 1/2 LITRE BENTLEY INLET VALVE 1.400" DIA… | ||
| scan0110 | Graph comparing the performance curves of standard and high-power Bentley engine units. | ||
| View original record | MAIN ENGINE BENTLEY. COMPARISON OF STANDARD AND HIGH POWER UNITS. ① STANDARD 3½ LITRE BENTLEY. ② HIGH POWER 3½ LITRE BENTLEY. ③ HIGH POWER 4¼ LITRE BENTLEY. COMPRESSION RATIO 6.4. VALVE SCALED UP IN… | ||
| scan0111 | Comparative efficiency of American car engines and the need to test exhaust system losses. | ||
| View original record | Sg. from Rm. Hs. c. E. c. By. Rm17/H.31.5.37. EFFICIENCY OF AMERICAN CAR ENGINES. We obtained a lot of American power curves while in America. We were able to get cross checks from the Companies… | ||
| scan0112 | Engine policy, comparing overhead, side valve, and push rod engines with reference to American designs. | ||
| View original record | -2- inlet side valve exhaust, which we believe can fairly easily be made. At the present moment, the overhead inlet side valve exhaust is still showing considerable promise, and it does, in addition,… | ||
| scan0113 | Producing an economical car, considering side-valve engines and referencing competitor performance. | ||
| View original record | -3- Rm17/R.31.5.37. If ever we should contemplate producing a car that is to represent economical transportation, then the side valve engine must receive serious consideration. It should be remembered… | ||
| scan0114 | Performance comparison graph of the 25/30 HP engine against American engines (Buick and Terraplane). | ||
| View original record | 25/30 COMPARED WITH AMERICAN ENGINES Top Graph: COMPARISON OF 25/30 H.P. BUICK AND TERRAPLANE. OPEN EXHAUST. Legend: - 25/30 - Buick - TERRAPLANE Bottom Graph: COMPARISON OF 25/30 H.P. AND BUICK… | ||
| scan0115 | Performance comparison graphs for typical 1937 side-valve engines, and for Buick and Chrysler 8-cylinder engines. | ||
| View original record | TOP GRAPH: TITLE: COMPARISON OF TYPICAL 1937 SIDE VALVE ENGINES TOP LEFT CORNER: 136 ⑦ LEFT Y-AXIS: B.M.E.P. GRAPH NOTE: CORRECTED TO N T P GRAPH NOTE: TERRAPLANE GIVES 94 H.P. AT 3,700 GRAPH CURVE… | ||
| scan0116 | Performance graph comparing the Brake Mean Effective Pressure (B.M.E.P.) of Bentley engines against American engines under different exhaust conditions. | ||
| View original record | BENTLEY COMPARED WITH AMERICAN ENGINES TOP GRAPH: B.M.E.P. CORRECTED TO N.T.P. OPEN EXHAUST 1937 BENTLEY 6.5-1 C/R 1938 BUICK 5.75-1 C/R 1937 TERRAPLANE 6.25-1 BENTLEY WITH LATEST OH INLET SIDE VALVE… | ||
| scan0117 | Two graphs comparing the BMEP of 1937/1938 Buick and Oldsmobile engines. | ||
| View original record | ① COMPARISON OF IMPROVEMENT BETWEEN 1937 AND 1938 BUICKS PUSH ROD B.M.E.P. CORRECTED TO N.T.P. ② COMPARISON BETWEEN TYPICAL SIDE VALVE AND PUSH ROD G. M. ENGINES. B.M.E.P. ENGINE | BORE | STROKE |… | ||
| scan0118 | Graph comparing the top gear acceleration of a 25/30 HP Saloon car against an Oldsmobile Eight Saloon car. | ||
| View original record | 9 COMPARISON OF TOP GEAR ACCELERATIONS OF RR. 25/30 H.P SALOON CAR & OLDSMOBILE EIGHT SALOON CAR ASSUMING COMPLETE CAR WT. IN EACH OF 42 CWTS. M.P.H TIME - SECS 1937 OLDSMOBILE EIGHT 1937 R.R. 25/30… | ||
| scan0119 | Comparison data of a No.2 High Power Head and a Standard Bentley Head for constant detonation. | ||
| View original record | To E. 81129 Rm/Ed.2/JH.31.5.37. Comparison of No.2 High Power Head and Standard Bentley for Constant detonation. Gain over Standard. R.P.M. 1000 1500 2000 2500 3000 3500 4000 4250 4500. Max. power.… | ||
| scan0120 | Performance graph comparing a high power head against a standard Bentley head for the same detonation intensity. | ||
| View original record | COMPARISON OF HIGH POWER HEAD (No 2) AND STANDARD BENTLEY FOR THE SAME DETN. INTENSITY. IGNITION ADVANCE B.M.E.P. STANDARD BENTLEY (6" DETN) No. 2 HIGH POWER (6" DETN) No. 2 HIGH POWER (MAX. POWER)… | ||
| scan0121 | Progress report on the single-cylinder development of an Overhead Inlet Side Valve Exhaust engine. | ||
| View original record | By. from Rm. c. Sg. c. Hs. c. Da. c. Mx. V29 OVERHEAD INLET SIDE VALVE EXHAUST ENGINE. In view of the fact that we are designing this type of combustion chamber into the new Phoenix engine as an… | ||
| scan0122 | Power comparison report between a high power inclined valve head and a standard 3.5 litre Bentley. | ||
| View original record | HIGH POWER HEAD. Power comparison. The inclined valve head was compared with standard Bentley, both with a dry liner alum. block and a cast iron block. The basis of comparison was (a) maximum power on… | ||
| scan0123 | Graph comparing performance against R.P.M. for different cylinder head, valve timing, and compression ratio configurations under constant detonation. | ||
| View original record | HIGH POWER HEAD - CONSTANT DETONATION 1) INCLINED VALVE HEAD AND DRY LINER BLOCK. C.R. 5.3 VALVE TIMING: I.O. T.D.C. I.C. 30°L. E.O. 35°E. E.C. T.D.C. EXHAUST VALVE = 1.500" 2) INCLINED VALVE HEAD AND… | ||
| scan0124 | Comparative performance graph showing Torque and M.E.P. curves for Bentley, Oldsmobile, and a 30 HP RR engine. | ||
| View original record | COMPARITIVE CURVES OF 25/30 BENTLEY AND OLDSMOBILE ① 4 1/4 BENTLEY - 6.4 : 1 C.R. BORE 3.5" STROKE 4.5" CAPACITY 259.5 c.i ② F37 - 6 CYL - OLDSMOBILE - 6.1 : 1 CR BORE 3.438" STROKE 4.125 - 229.7 c.i… | ||
| scan0125 | Graph comparing B.M.E.P. against R.P.M. for different high-power head configurations. | ||
| View original record | HIGH POWER HEAD - MAX. POWER ① INCLINED VALVE HEAD AND DRY LINER BLOCK VALVE TIMING:- I.O T.D.C.; I.C. 30° L; E.O. 35° E; E.C. T.D.C. C.R. = 6.3 EXHAUST VALVE = 1.500" DIA. ② INCLINED VALVE HEAD AND… | ||
| scan0126 | Resource allocation and the urgent need for design work on a single-cylinder high power head unit. | ||
| View original record | By. from Rm. γ 1129 Rm.20/AP.27.8.37 SINGLE CYLINDER UNIT As previously discussed, we have two test beds and three testers permanently allotted to single cylinder and research investigation. To keep… | ||
| scan0127 | Programme outlining tests and modifications for a single-cylinder unit, focusing on back pressure and camshaft design. | ||
| View original record | CHASSIS SINGLE CYLINDER UNIT The following is the programme it is intended to follow on the above unit. As soon as possible we are anxious to try out a head and block of the type to be used on the… | ||
| scan0128 | Proposed modifications and tests for engine valve gear and valve seats. | ||
| View original record | -2- (2) Venturi Valve Seats These should be tried out on the alum. high pressure heads, using a 1.750" valve and also a 1.600" valve. Provision should also be made for replacing the 1.600 venturi seat… | ||
| scan0129 | Outlining proposed engine component modifications and testing requirements. | ||
| View original record | -3- (5) continued A new camshaft will also be required with a .400" lift and this could be made from a J.1. lift curve, if possible with serrations as called for in section (1). (6) Wraith Bottom… | ||
| scan0130 | Secret memo detailing modifications for the Phoenix combustion chamber, specifically adapting the LeC.5368 high power head. | ||
| View original record | SECRET. HPS. from Rm/Ed. 1129 also 1044 Rm/Ed9/R.31.8.37. PHOENIX COMBUSTION CHAMBER. We send you herewith a sketch showing various modifications to the single cylinder high power head, LeC.5368,… | ||
| scan0131 | Differential thermal expansion in a high-powered engine with an aluminium head and cast iron block. | ||
| View original record | Rm/Swdl. from Rm. c. Ry. c. Jnr. c. Rm/Ed. 1129 Rm11/R.2.9.37. When we come to the high-powered engine, we shall have an aluminium head and a cast iron cylinder block. We know from our experience on… | ||
| scan0132 | Brief report on the development of a high-power engine head, detailing issues and recommendations. | ||
| View original record | HIGH POWER HEAD. The following is a brief report of all the work done on the above head since the start of its development. Salient points are given, and recommendations for a main engine made. (1)… | ||
| scan0133 | Blueprint graph of ignition advance curves against engine RPM for different cylinder head designs. | ||
| View original record | FIG: III IGNITION ADVANCE CURVES IGNITION ADVANCE R.P.M. ① No: 1 HEAD AND No: 2 HEAD WHEN TURBULENT. THROAT AREAS = 1.01 AND .96 □" ② No: 2 HEAD DE-TURBULATED. THROAT AREA = 1.16 □" ③ No: 4 INCLINED… | ||
| scan0134 | Graph of detonation intensity versus RPM for four different high power head configurations. | ||
| View original record | FIG 2. DETONATION ON HIGH POWER HEADS. DETONATION INTENSITY (FT) R.P.M. ① No 1 HEAD - UNCOOLED EXHAUST VALVE C.R. = 6.4 ② No 2 HEAD UNCOOLED EXHAUST VALVE C.R. = 6.23 THROAT AREA 14% GREATER THAN FOR… | ||
| scan0135 | Blueprint showing the arrangement of a coolant jet in high power blocks. | ||
| View original record | ARRANGEMENT OF COOLANT JET IN HIGH POWER BLOCKS, Fig I., COOLANT JET, ED, 10 8 37 | ||
| scan0136 | Engine detonation tests comparing different cylinder head materials, valve types, and ignition settings. | ||
| View original record | -2- It appeared, however, unaffected by - (i) Compression ratio up to 6.8. (ii) Ignition advance within very wide limits. (iii) Type of plug used. (iv) Cylinder head material. It was found that high… | ||
| scan0137 | Power comparison graph for different high power head configurations at constant detonation. | ||
| View original record | HIGH POWER HEAD FIG. 4 POWER COMPARISON AT CONSTANT DETONATION. B.M.E.P. MAIN ENGINE B.H.P. R.P.M. ① STANDARD 3½ LITRE BENTLEY. C.R.=6.4. VALVE TIMING:- I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. ②… | ||
| scan0138 | Engine performance report on plug position, power output, and detonation tests. | ||
| View original record | -3- (4) PLUG POSITION. Two plug positions were tried, one over the throat, and one over the exhaust valve. The throat plug was selected as best, because (i) Detonation was at a minimum and power a… | ||
| scan0139 | The development and testing of inlet and exhaust valves, including different types, timing and bounce issues. | ||
| View original record | -4- (i) Inlet Valve. Two inlet valves have been tried, one a flat valve, the other of the tulip type. The former type, however, suffered two failures by cracking, and was abandoned in favour of the… | ||
| scan0140 | Graph comparing power output (BHP) and BMEP for different cylinder head configurations against engine RPM. | ||
| View original record | HIGH POWER HEAD FIG V POWER ON INCLINED VALVE HEAD B.M.E.P. MAIN ENGINE B.H.P R.P.M. 1 STANDARD BENTLEY (3 1/2 LITRE) C.R = 6.4 VALVE TIMING :- I.O. 4°E; I.C. 51°L; E.O 51°E; E.C. 7°L; 2 INCLINED… | ||
| scan0141 | Graph plotting B.M.E.P. against back pressure for back pressure tests at 4000 R.P.M. | ||
| View original record | HIGH POWER HEAD FIG VI BACK PRESSURE TESTS - 4000 R.P.M B.M.E.P. BACK PRESSURE "HG ① STANDARD BENTLEY (3 1/2 LITRE) C.R. = 6.4. VALVE TIMING:- I.O. 4°E; I.C. 51°L; E.O 51°E; E.C. 7°L. ② INCLINED VALVE… | ||
| scan0142 | Engine valve and timing tests to address detonation and improve power output on a Bentley engine. | ||
| View original record | -5- Two types of valve were run, solid and stem-cooled, this latter being used to cure detonation troubles dealt with in section (2) above. Ultimately, on No.4 head, a solid valve was found O.K., and… | ||
| scan0143 | Power comparison graph of three different cylinder head designs, plotting B.M.E.P. and Main Engine B.HP against R.P.M. | ||
| View original record | HIGH POWER HEAD. FIG. VII. POWER COMPARISON OF CYLINDER HEADS. B.M.E.P. MAIN ENGINE B.H.P. R.P.M. ① No. 2 CYLINDER HEAD THROAT AREA = .96 □" EXHAUST VALVE = 1.500" DIA. C.R. = 6.3 ② No. 1 CYLINDER… | ||
| scan0144 | The testing of various cylinder heads, cylinder blocks, and an analysis of slow running performance. | ||
| View original record | -6- 23.8.37. (d) Cylinder Heads. Six cylinder heads have been tried, including two twin valve heads, one in cast iron and one in aluminium. These, however, due to complications in valve gear, were… | ||
| scan0145 | Engine component failures and their running hours. | ||
| View original record | -7- Against good slow running we have the size of inlet port and valve. If high speed power is to be maintained and full advantage taken of the large port and valve, a large induction system will be… | ||
| scan0146 | General conclusions on engine head development, covering gaskets, cooling, valves, and timing. | ||
| View original record | -8- Gaskets. Considerable trouble was experienced with leaky gaskets due to insufficient clearance between the combustion space and stud holes. C. & A. gaskets appeared the best. (a) GENERAL… | ||
| scan0147 | Technical memorandum discussing valve gear design, back pressure issues, and cylinder head development. | ||
| View original record | -9- (viii) Valve Gear. The valve gear, looked at from the point of view of the bottom tappet appears to be rather heavy. Loadings of the valve spring are up to Wraith figures, viz., 32.6 lbs seat load… | ||
| scan0148 | Photograph and details of the No. 2 high power block with an exhaust valve. | ||
| View original record | No.2. HIGH POWER BLOCK. 1.500" diameter exhaust valve with inserted valve seat. Dry cylinder liner. Material - aluminium. | ||
| scan0149 | Photograph of the No.1 High Power Head, showing the combustion chamber, and its associated inlet valve. | ||
| View original record | No.1. HIGH POWER HEAD. Inlet valve 1.750" diameter. Material - Cast Iron. | ||
| scan0150 | Photograph of a No.1 high power block with an exhaust valve. | ||
| View original record | No.1. HIGH POWER BLOCK. 1.500" or 1.600" diameter exhaust valve. Material - Cast Iron. --------------------- | ||
| scan0151 | Photograph of the No.2 High Power Block with details on its construction. | ||
| View original record | No.2. HIGH POWER BLOCK. 1.500" diameter exhaust valve with inserted valve seat. Dry cylinder liner. Material - aluminium. | ||
| scan0152 | Photograph of a No.2 High Power Head and its corresponding inlet valve. | ||
| View original record | No.2. HIGH POWER HEAD. Inlet valve 1.750" diameter. Material - Cast Iron. | ||
| scan0153 | Photograph of a high power aluminium cylinder head with an inserted valve seat and a separate inlet valve. | ||
| View original record | No.3. HIGH POWER HEAD. Inlet valve 1.850" diameter - Inserted valve seat. Material - Aluminium. | ||
| scan0154 | Photograph and details of the No. 4 High Power Head. | ||
| View original record | No.4 High Power Head. Inclined inlet valve 1.750" diameter. Material - aluminium. | ||
| scan0155 | Lighter valve gear mechanism on the new main engine head and its expected performance. | ||
| View original record | To Rm File. N29a. 12.10.37 High Power Valve Gear Inertia The valve gear mechanism as fitted to No 5 head. i.e. the new main engine head, is lighter than the old valve gear, due to shortened rocker.… | ||
| scan0156 | Index of memos regarding high power cylinder head development. | ||
| View original record | 1129A HIGH POWER HEAD MEMOS. Reference. Subject. Circulated. Hs/Rm.12/KW. 19.11.34 (4 pages) Car single cylinder develop-ment work. Not sent out. Hs/Wd.2/GB. 2.1.35. (1 page) Initial comments on… | ||
| scan0157 | Index page listing technical reports with their subjects, reference numbers, and circulation lists from 1935-1936. | ||
| View original record | -2- Reference. | Subject. | Circulation. E.2/HP.31.5.35. E/PSN.2/MN. 30.5.35. (6 pages, 1 print) | Engine Data & Engine Breathing Capacity. | Sg, Wor, Rg, Hs, Ps, Le, By, Lr, Wd, Rbr. Hs/Rm.15/KW.… | ||
| scan0158 | Index page of internal memos and instructions from October and November 1936. | ||
| View original record | -3- Reference. Subject. Circulated. E/PSN.2/MN. Instructions for Block with RHC, Rm, Da, By 9.10.36. 1.600" exhaust valve. Ed. (1 page) E/PSN.1/MN. Alum head instructed. RHC, Rm, Da, By 15.10.36. Ed.… | ||
| scan0159 | Index page listing reports with their reference numbers, subjects, and circulation lists. | ||
| View original record | -4- Reference. | Subject. | Circulated. E/PSN.3/MN. 19.11.36. (2 pages) | Inclined Valve Alum Head. | By, RHC, Rm, Da, Ed. E/PSN.1/MN. 8.12.36. (1 page) | Throat areas on High Power Heads. | Rm, Da,… | ||
| scan0160 | History and progress of the High Power Cylinder Head Project. | ||
| View original record | 1029a Hs. from Rm. Sg. c. Ey. c. RHC. HIGH POWER CYLINDER HEAD PROJECT. We accept the responsibility for starting off the original single cylinder drawings of the High Power head, and for the work… | ||
| scan0161 | Progress and costs of a High Power engine head project and single-cylinder work. | ||
| View original record | -2- The best way to do this was under discussion for some time, a mock up design for applying the High Power head to the existing Bentley engine (as was done with the O.H. camshaft) being prepared.… | ||
| scan0162 | Uncovered aero figure from the previous year and the scale of single cylinder work. | ||
| View original record | -3- Rm6/R.15.10.37. aero figure last year not covered by contracts was £5,984. Some of the information obtained for the money is contained in the memos enumerated on the attached sheet. We cannot… | ||
| scan0163 | Visit to Coventry Climax Engines Ltd. to gather information on an O.H.I. type engine. | ||
| View original record | To By. from Rm/Ed. c. Hs. c. Da. c. Da/Hnr. Rm/Ed.1/MR.16.10.37. VISIT TO COVENTRY CLIMAX ENGINES LTD. A visit was paid to the above firm by the writer on the 12th. instant, with the object of… | ||
| scan0164 | Report discussing engine detonation, ignition advance, and spark plug positioning. | ||
| View original record | -2- (3) Detonation. Detonation was stated to be influenced to a great extent by the gas velocity through the throat, and if this were too high trouble would be encountered. This confirms our own… | ||
| scan0165 | Report discussing engine performance, including spark plug reach, valve overlap, engine breathing, and exhaust valve temperature. | ||
| View original record | -3- and power and detonation qualities decrease. The reach of the plug was also stated to be a critical factor. If this were too long the plug would become overheated, and if too short, and recessed… | ||
| scan0166 | Report discussing design considerations for engine valves and ports, including temperature, shape, and cooling. | ||
| View original record | -4- (7) Exhaust Valve Temperature - Cont'd. A point about the valve arrangement which was stressed by Bertelli, is the great advantages you can get in the way of exhaust valve cooling, even while… | ||
| scan0167 | Diagrams of an O.H.C. 3 Litre Coventry Climax and a Ricardo Venturi Inlet Port. | ||
| View original record | SCT 68, EXHAUST, INLET, O.H.C. 3 LITRE COVENTRY CLIMAX, SCT 69, RICARDO VENTURI INLET PORT, ROLLS-ROYCE, LTD., PRINT ROOM, OCT 18 1937, DERBY., ED, 8.10.37 | ||
| scan0168 | Letter to Coventry Climax Engines Ltd. requesting a list of engine part weights. | ||
| View original record | + 11292 Rm/Ed.6/MH. Mr. Leonard P.Lee, Messrs. Coventry Climax Engines Ltd., Friar's Road, Coventry. 18th. October 1937. Dear Sir, As arranged between us last Tuesday I am sending herewith a list of… | ||
| scan0169 | Letter discussing a list and declining to share information on the latest O.H.1 cylinder head. | ||
| View original record | -2- Rm/Ed.6/WH.18.10.37. On looking this list over it looks very formidable, but I hope you will manage to let us have them, as it will serve as a very useful guide. I asked Mr. Robotham about letting… | ||
| scan0170 | Thank you letter to Leonard P. Lee of Coventry Climax Engines Ltd for a list of weights and an update on O.H.1 head tests. | ||
| View original record | 1129a. Rm/Ed.2/MH. 2nd. December 1937. Leonard P.Lee, Esq., Messrs. Coventry Climax Engines Ltd., Friars Road, COVENTRY. Dear Mr. Lee, Many thanks for your letter of the 29th. ultimo, and the list of… | ||
| scan0171 | Cover note discussing a weight analysis comparison between a Coventry Climax engine and a Bentley engine for the High Power Unit project. | ||
| View original record | To Rm 1129a. COPY FOR FILES ON HIGH POWER UNIT. Phoenix OH1 Engine Weights 1. 12. 34 Herewith a copy of a weigh analysis sent by Coventry Climax of their 2 litre engine. As will be seen these figures… | ||
| scan0172 | List of weights for the components of a 2-litre type JGS engine with a fully counterweighted, completely machined crankshaft. | ||
| View original record | COVENTRY CLIMAX ENGINES LTD. SHEET No......... WEIGHTS OF COMPONENTS FOR 2 LITRE TYPE JGS.ENGINE FITTED WITH FULLY COUNTERWEIGHTED COMPLETELY MACHINED CRANKSHAFT. B. C.C. 1. Cylinder Block and… | ||
| scan0173 | Weight calculation sheet for engine components from Coventry Climax Engines Ltd. | ||
| View original record | COVENTRY CLIMAX ENGINES LTD. - 2 - SHEET No........... S1. Miscellaneous Bolts, Studs and Nuts. 2.25 5 lbs. Total Weight of Engine. 623.0 503.25 lbs. [Watermark] DOMINION BOND | ||
| scan0174 | Valve timing tests for high power single-cylinder units and proposals for future development, including a new cylinder head. | ||
| View original record | File 1129a HIGH POWER UNITS. 20.12.37. A considerable amount of work on valve timing etc. has been carried out on the above unit, and it has been found that best all round performance is given by I.O… | ||
| scan0175 | Proposed modifications and allowances for engine components including metal thickness and throat area. | ||
| View original record | -2- 20.12.37. sizes and slopes and valve size. The following allowances should, however, be made - (a) Metal thickness on face. This should be at least .400" thick, as there is then ample metal to… | ||
| scan0176 | Follow-up memo requesting the status on the matter of a High Power Cylinder Head. | ||
| View original record | 1129a. S/W To Rm. from Sg. re High Power Cylinder Head. Sg12/E31.1.38 Referring to Rm6/R15.10.37 would you please let me know how this matter now stands? Sg. | ||
| scan0177 | The suspension of a single-cylinder project and the design status of a less costly engine for Phoenix. | ||
| View original record | ./129a Sg. from Rm. Rm6/R.1.2.38. Replying to Sg12/E31.1.38., all single cylinder work has been suspended on this project pending the completion of tests and designs incorporating the information… | ||
| scan0178 | Confirming an agreement to start a new high power unit at the same size as the 4.5-litre Bentley. | ||
| View original record | By. from Rm. c. Da. c. Da/Jnr. 1129a ? Rm1/R.22.2.38. HIGH POWER UNIT. This is to confirm that it was agreed at yesterday's Conference with Sg. that this unit should start life the same size as the… | ||
| scan0179 | Secret memo discussing competitor engine projects from Morris Motors and Vauxhall, and urging the completion of drawings for a new high-power engine. | ||
| View original record | SECRET. 1129a By. from Rm. Rm4/R.29.4.38. HIGH POWER ENGINE. Confirming our talk on the subject, we confirm that both Morris Motors and Vauxhalls have started up projects to produce new types of… | ||
| scan0180 | Requesting a cylinder head with a 7½:1 compression ratio and flat top pistons for a High Power engine test. | ||
| View original record | 1129a? To Rm/Swdl.from Rm. Rm/Swdl.3/MH.5.10.38. In order to get a range of parts to test on the High Power engine we should like you to put through a cylinder head with 7½ : 1 compression ratio with… | ||
| scan0181 | Secret memo outlining preliminary cost and weight savings for a new high-power engine unit. | ||
| View original record | 1129a also 1260 SECRET. Sg. from Hm. Ks. c. By. c. HEC. c. Da. c. HPS. c. Da/Jnr. Hml/R.26.10.38. HIGH POWER ENGINE UNITS. We have now got a preliminary picture of this engine with regard to cost,… | ||
| scan0182 | Engine power improvements and experimental variations of the High Power Head Project, including proposals for a Straight Eight and 5-litre Six-cylinder engine. | ||
| View original record | -2- Power. Whilst we believe that we have not yet got the correct valve timing to obtain the best out of this engine, it has been demonstrated that it is possible to run with about 8% more M.E.P. at… | ||
| scan0183 | The merits and costs of an aluminium Straight Eight engine compared to a cast iron version. | ||
| View original record | -3- Aluminium Straight Eight. The disadvantage of a heavy power unit is not confined to the effect its weight has on the acceleration of the vehicle. The engine mass is now centred so very far forward… | ||
| scan0184 | Power output graph for a 4¼ Litre Bentley engine, comparing two different compression ratios. | ||
| View original record | 4¼ LITRE BENTLEY POWER OUTPUT S. 58 ① B.II 6.6:1 C/R ② B.60 7:1 C/R WITH TEST BED EXHAUST SYSTEM SHELL PETROL BOTH HAVE SAME INDUCTION PIPES & CARBS B.H.P M.E.P NOTE:- BOTH CURVES ARE FOR… | ||
| scan0185 | Design and development tasks for a high power cylinder head. | ||
| View original record | Da/Jnr. from Rm. Rm/Swdl. HIGH POWER HEAD. Design. (1) Jnr. to investigate possibilities of moving inlet valve over towards ex. valve. (2) Full Bumps and c/r to suit. (3) Spark plug Position.… | ||
| scan0186 | Progress report on the B.60 engine test, comparing novel modifications to the conventional 4¼-litre engine. | ||
| View original record | To By. from RM. c. HS. c. Da. c. RHC. c. HPS. c. Day/Jnr. c. Day/MOS. HIGH POWER ENGINES. In reading the attached report it must be remembered that we have had a B.60 on test for just over four… | ||
| scan0187 | The unsolved problems of developing a harmonic damper and a crank pinion spring drive for an engine. | ||
| View original record | -2- Rm.1/WH.9.2.39. Regarding Section (2). It is here that we have the unsolved problems. We have yet to develop the harmonic type of damper until it will stand up to the conditions on our engine.… | ||
| scan0188 | Test report on the development of the Bentley B.60 unit, detailing cylinder head modifications and ignition issues. | ||
| View original record | To By. From Rm/Swdl. c. Hs. c. Da. c. HRC. c. HPS. c. De/Jnr. c. De/Res. BENTLEY 60 UNIT TEST. We give herewith an up to date report of the develop-ment of the B.60 unit and its position relative to… | ||
| scan0189 | Engine modifications to reduce running-on, including increasing transfer throat area, fitting sodium-filled exhaust valves, and altering water passages. | ||
| View original record | -2- Rm/Swdl.2/WR.1.2.39. account for such an alteration to the running of the engine, to quote, an "angel to a devil". This view was confirmed and was mainly found to be the reduction in transfer… | ||
| scan0190 | Performance graph showing Mean Effective Pressure and Ignition Advance against RPM for a modified cylinder head. | ||
| View original record | -3- ⑤ CYLINDER HEAD WITH INCREASED THROAT FD 292 BUT .070 MACHINED OFF HEAD FACE (COMP RATIO 6.8:1) STD PISTONS SODIUM FILLED EX.VALVES MAX. POWER x---x NON DETONATING. MEP lbs/□" IGN. ADV °BTDC RPM… | ||
| scan0191 | Blueprint graph and analysis of engine performance, showing Mean Effective Pressure vs. R.P.M. | ||
| View original record | -4- ③ As CURVE ① BUT STD PISTONS -.030 BELOW CYLINDER BLOCK 6.25:1 COMP RATIO --- MAX POWER x---x NON DETONATING Graph Data: X-Axis: R.P.M. (1000, 2000, 3000) Left Y-Axis: MEP lbs/□' (100, 110, 120,… | ||
| scan0192 | Performance graph and analysis for raised crown pistons with a 7:1 compression ratio. | ||
| View original record | -5- Rm/Swd1.2/KH.1.2.39. ④ AS CURVE ③ WITH PD.304 RAISED CROWN PISTONS AS DESIGNED 7:1 COMP RATIO MAX. POWER NON DETONATING. MEP lbs/□" RPM * IGN ADV °BTDC MEP IGN Curve (4). This condition is as… | ||
| scan0193 | Graph showing engine performance with a modified cylinder head, pistons, and a 6.8:1 compression ratio. | ||
| View original record | -6- ② CYLINDER HEAD THROAT OPENED OUT TO PD 292 (SODIUM FILLED EX. VALVES) RAISED CROWN PISTONS. PD 304 WITH .100 MACHINED OFF TOP OF BUMPS. 6.8:1 COMP. RATIO MAX. POWER x---x NON DETONATING MEP lbs/D… | ||
| scan0194 | Performance graph and test analysis for a cylinder head with an opened out throat, sodium filled exhaust valves and flush top pistons. | ||
| View original record | -7- ① CYLINDER HEAD THROAT OPENED OUT TO PD 292 (SODIUM FILLED EX. VALVES) FLUSH TOP PISTONS 6.4:1 COMP. RATIO ——— MAX POWER x———x NON DETONATING Graph Data: X-Axis: RPM (1000, 2000, 3000) Left… | ||
| scan0195 | Summary of test results and conclusions on engine performance, detonation, and power output. | ||
| View original record | -8- Rm/Swdl.2/MH.1.2.39. Summarising the results of these tests the following conclusions are made. (1) The larger the throat area the better the maximum and non detonating power, to quote, 6.8 : 1… | ||
| scan0196 | Various troubles, test results, and attempted solutions for a crankshaft damper. | ||
| View original record | -9- CRANKSHAFT DAMPER. We have experienced a considerable amount of trouble with the crankshaft damper, so much so that the oscillation comparisons taken with various loadings in trying to tune the… | ||
| scan0197 | Camwheel failure due to crankshaft oscillation and a discussion on valve gear spring design to prevent bounce. | ||
| View original record | -10- which speed the oscillation is .45 degree. After a further 34 hrs. the new camwheel failed in the same manner as the first, i.e. stripping the teeth. We cannot forecast how much we shall be able… | ||
| scan0198 | Technical report on inlet valve tappet clearance, rod types, and camshaft performance. | ||
| View original record | -11- RM/Swdl.2/MH.1.2.39. Regarding the differential expansion rate as affecting the inlet valve tappet clearance we find that steel rods are nearer to a constant figure than the Dural rods. The… | ||
| scan0199 | Component testing results for shafts, petrol pumps, dynamos, and proposals for further tests. | ||
| View original record | -12- Since dropping the last Monichrome shaft and using the normal S/K shaft no further trouble has been experienced on the wear of the distributor driving teeth. During the endurance run, slack has… | ||
| scan0200 | Engine modifications, including spring drive, combustion chamber design, and induction system development. | ||
| View original record | -13- (2) Adaption of spring drive (Wraith type) to isolate cam wheel and shaft coupled with distributor and oil pump from the torsional oscillation of the crank-shaft. (3) Intermediate between design… | ||
| scan0201 | Power curve comparison chart for B.V. and B.60 engine units. | ||
| View original record | COMPARISON OF B.V. UNIT AND B.60 UNIT (POWER.) CURVE C ① BOTH UNITS WITH STD. B.V. SYSTEM 2-1 1/2 S.U. CARBS. B.60 - OPEN EXHAUST OPENED THROAT PD 292 AEROLITE PISTONS FLUSH WITH TOP OF BLOCK 6·4:1… | ||
| scan0202 | Graph plotting the results of a torsional oscillation test on a B.60 engine with various damper configurations. | ||
| View original record | TORSIONAL OSCILLATION TEST ON B.60 B.60 DAMPER SET AT 219 LBS FT/DEGREE B.60 WITHOUT DAMPER STUDEBAKER DAMPER STUDEBAKER DAMPER WITH INCREASED INERTIA STANDARD WRAITH ENGINE R.P.M. AMPLITUDE DEGREES… | ||
| scan0203 | Creation of a new engine pattern for both conventional and high-power engines. | ||
| View original record | 1129a Hs. from Rm. c. By. Rm5/R.16.2.39. CAST IRON ENGINES. As we pointed out in our recent report, we believe that we are going to make a success of the High Power project. A conventional engine has,… | ||
| scan0204 | Cover note for report S.339, which details design features and test results for high power heads. | ||
| View original record | FILE. 1129A. To Wym. from Rm/CTS/HWH. Rm/CTS/HWH.11/VS.4.5.44. High Power Heads. Attached to this note is a copy of S.339 incorporating all the design features and test results, which have so far been… | ||
| scan0205 | Addition of test results for High Power Heads to design chart S.339. | ||
| View original record | 1129 A To. Rm. C.c. Ev. C.c. Jnr. C.c. Rm/CTS. Rm/Hog.JMA. 4.5.44 High Power Heads. As requested by you in Rm.13/h 26.4.44 the test results have now been added to the design features shown on S.339… | ||