Rolls-Royce Archives
| Identifier | Entry | ||
| Scan001 | Log of oil capacity, cylinder compression, and power measurements for various chassis numbers. | ||
| View original record | Oil capacity of cyls. & compressions & powers X790 Chassis N. | Oil Capacity | Compression H.P. | Max: H.P | Remarks | 4400 1136 | 11. 14 1/2 | 73 | 42.9 | Chirps bad 1166 | 11. 14 | 79 | 40 | do.… | ||
| Scan002 | Engine compression test results, calculating cylinder capacity and recording gauge pressures for 1906 and 1907 type engines. | ||
| View original record | Engine Compressions. X790 4400 Test taken on No 6 (first run) 1907 type Capacity of cylinder (top of stroke) 1 pint Price's 'B' weighs 18 ozs. amt. used in cylr = 10.835 ozs ∴ cap. = 10.835 / 18 =… | ||
| Scan003 | Test results for engine compression and maximum explosion pressure. | ||
| View original record | X790 4400 Compressions & Maximum explosion pressure Test 60592. with gauged non return. valve. (see timing record.) With no slack inlet. - max. compression. 59 lbs □, above — .005 — 60 20 63. soon… | ||
| Scan004 | Engine compression test results for various cars. | ||
| View original record | Engine Compressions X790 4400 Taken on 60592 - 1907 long. Compressions with gauge on non stop. above atmosphere. 60 lbs. Have tested with oil. 13 1/2 oz. Pres B 1 pint = 18 g. .. = 26 cu ins. similar… | ||
| Scan005 | Notes on compression tests for different engine piston rings and cylinder configurations. | ||
| View original record | R.R. 148 (1g N) (M.C. 699. 16.3.08) G. 3639. X790 4400 Compression test. taken with 6" dial gauges & non return valve. on M408 at R.A.C. best cylinder bore - 70 lbs. on road after stronger piston… | ||
| Scan006 | Letter to Mr. Royce regarding a proposal to increase the standard engine compression volume. | ||
| View original record | B1/B21910. 21st September 1910. Mr. Royce, Re Compression Volumes of Standard Engines. Mr. Platford is very anxious that we should increase our standard compression volume from 24 1/2 cu. ins. to 25… | ||
| Scan007 | Telegram from Royce to Barrington with instructions to increase a clearance with a specified tolerance. | ||
| View original record | POST OFFICE TELEGRAPHS. 8790 Office Stamp: DERBY * SP 22 10 Received here at 9.50 AM If the Receiver of an Inland Telegram doubts its accuracy, he may have it repeated on payment of half the amount… | ||
| Scan008 | Engine vibration differences between the 1300 and 1400 series due to cylinder capacity measurement errors. | ||
| View original record | C.J. X790 27th September 1910. R5/D27910 Re Engines. Absolutely the only difference in vibration at slow speed between the 1300 and the 1400 series is due to the error in the measurement of the… | ||
| Scan009 | Proposal to modify engine volume to 27 cubic inches to improve smoothness, reduce crankshaft rattle and other issues. | ||
| View original record | C.J. (2) 27th Sept. 1910 COPY C.J. to C.C.[?] (Original sent.) speed and there is no reason why this conclusion should not be right. We now propose to go to 27## cubic inches as near as we can… | ||
| Scan010 | Letter detailing the decision to cease increasing engine compression due to a list of resulting faults. | ||
| View original record | 1st October1910. R9/D11010 See over Claude Johnson, Esq. Pitlochry. Dear C.J., We have definitely and for all time given up all idea of ever raising the compression. 60 lbs. gauge reading seems to be… | ||
| Scan011 | Letter discussing engine B.HP for the 1913 car, with handwritten notes comparing the hill-climbing performance of car '1601' to the 'Silver Phantom'. | ||
| View original record | 235A (100H) (F 355. 18.8.10) E.P. 7252. C.J. (2) 1st October 1910 not find any material advantage. Our B.H.P. was not accurately measured, otherwise I feel certain it would have been found to be very… | ||
| Scan012 | List of high compression and long stroke engines prepared by the Repair Department. | ||
| View original record | Handwritten: Copied from Mills' list of 28/9/10. Johnson. X790 This is for Repair Depart + Haselhurst should have copies of this information J 10/10 Typed: R.H.M. 7th October 1910 High Compression… | ||
| Scan013 | Continued list of numerical references for High Compression engines. | ||
| View original record | 5A (cont) (P 355. 18.8.10) E.P. 7252. (2) High Compression engines. (Contd). 1829 1889 1815 1819 1884 1879 1825 1882 1828 1813 1827 1808 1809 1818 1814 1805 1811 1804 1812 1892 1886 1874 1807 1885… | ||
| Scan014 | List of high compression engine numbers that have had their compression lowered since leaving the works. | ||
| View original record | (2) High Compression Engines (Contd) The following have had the compression lowered since leaving the Works - 1195 1174 1189 1118 1184 1106 1181 1105 1111 1114 1014 1258 1166 1108 1177 1008 982 1000… | ||
| Scan015 | 'sweetness of running' in engines, focusing on balance and compression. | ||
| View original record | [Handwritten: L Guard book] R. 2554 (100M) (P 355. 18.8.10) E.P. 7252. 22nd Sept. 1910 Re Engines. XY90 C.J. 22/9/10 R5/D22910 Referring to the sweetness of our old engines, we need not worry much… | ||
| Scan016 | Engine vibration, compression standards, and cylinder correction methods. | ||
| View original record | R.W. 2354 (1000) (P 355. 18.8.10) E.P. 7952. 22nd Sept. 1910 C.J. (2) charge at higher speeds, which means more vibration (crankshaft); but I think 1600, 1601, and 1602 are not quite down as low as… | ||
| Scan017 | Correcting engine batches sent out with too high compression. | ||
| View original record | Typed Text: 22nd Sept. 1910. C.J. 22/9/10 (S) and power also, if possible. To this end we are working. I am sorry some batches have been sent out with too high compression, but all are being corrected… | ||
| Scan018 | Engine chirping issues and remedial actions taken on a 3-ring piston. | ||
| View original record | R.R. 134m (100 T) - S.H. 89. 7-7-20; G 1769 X.790. omitted Price's also Valvoline ENGINE - CHIRPS. Fixed 3-ring piston .006" top .002 bottom straight taper - 1200 car - 80 lbs. compression. Chirps got… | ||
| Scan019 | Power and compression test results for Chassis 1177 with specially high compression. | ||
| View original record | R.R. 258a (100 T) S.H. 89. 22-7-20. G 2769 X.790 Power & Compressions. Compressions on Chassis 1177 (specially high). 83 to 89 lbs. by gauge and Horse-powers were Revs. HP. 1000 37.1 1250 42.5 1500… | ||
| Scan020 | Compression test on a 1910 type standard engine using oil instead of a gauge. | ||
| View original record | R.R. 256m (100 T) S.H. 89. 22-7-20) G 2769 X.790. Compression of 1910 type standard engine tested with oil instead of gauge - worked out at 75 lbs. Test taken 29.7.09. - By Lowe. | ||
| Scan021 | Table showing compression test results at various engine speeds for a test engine. | ||
| View original record | R.R. 255a (100 T) S.H. No. 29. 2-20) G 2769 X.790. taken by Lowe on test engine 10.8.09. Compression at Various Speeds. 4400. Revs. Compression! 250 78 500 79 750 80.5 1000 80 1250 77,5 1500 73.5 1750… | ||
| Scan022 | List of compression values for various engine types and configurations. | ||
| View original record | R.R. 238a (100 T) S.H. 89. 23-7-20) G 2760 X.790. Compressions of various type engines. 919. Steel pistons, flat-faced valves front 3 cylinders 82, rear three - 86. 945 - Standard engine, long stroke,… | ||
| Scan023 | Table of engine compression measurements at different speeds for chassis No. 935. | ||
| View original record | H.R. 288a (100 T) R.H. sg. 23-7-20: G 2769 X.790. Compressions at varying engine speeds. Takes on chassis No. 935 (4 1/4" stroke) with non-return valve tackle, fixed in ignition plug hole and Mr.… | ||
| Scan024 | Modifications for Chassis 1719 (Bolton) and 1869 (Gjers) to achieve higher speeds. | ||
| View original record | R.R. 25M (100 T) S.H. 89. 22-7-20; G. 2768 X.790. Copy. Mr. Swetnam. 7 Sept. 1911. Re Chassis 1719 (Bolton) and 1869 (Gjers). The above cars will be fitted with the following fittings to render them… | ||
| Scan025 | Test results for engine explosion pressures for each of the six cylinders. | ||
| View original record | R38. 148 (b) (w) (W 653. 13.10.11) G 3051. Aviation X790 5/12/11 Explosion pressures 4100 Taken on 1731 by this engine hard & lumpy compression 64 lbs, taken with Okill gauge. car run at 35 m.p.h.… | ||
| Scan026 | Comparing the weights of L-E engines versus standard engines. | ||
| View original record | X790 Comparison L-E Engines 63 & 64 lbs Standard a. 58 & 59 lbs average. For Harkness v. 1:10:13. | ||
| Scan027 | Engine horsepower, compression ratios, and comparisons between engine 2704 and a 'Sluggard' engine. | ||
| View original record | C O P Y. To Wor. from R for Mr Hives. Copy to J. Copy to E. With reference to the horsepower obtained on 2704, compared with the Sluggard horsepower, we presume that the Sluggard had a larger… | ||
| Scan028 | Outlining design faults and suggested modifications for a specific chassis. | ||
| View original record | COPY. COPY. R10/P 6. 3. 14. To Wor. from R. Copy to J. Copy to Da. Copy to E. Copy to By. X790 With reference to 2704B, please do not repeat the same faults on this as have happened on 2704A. (1) In… | ||
| Scan029 | Urgent request for the clearance volume of an engine at 80 lbs. compression. | ||
| View original record | MOST URGENT. 14th September 1914. EL/B14914. To Works Supt. Copy to Mr. 16·8·14 Would you kindly let me have, at the earliest possible moment, the clearance volume of the Rolls-Royce engine at 80 lbs.… | ||
| Scan030 | Note on the clearance volume of an engine with 80 lbs compression. | ||
| View original record | X790 16.9.14 Mr Elliott The clearance volume of a Rolls Royce engine with 80 lbs compression is 20.5 cubic inches. | ||
| Scan031 | Clearance volume of an engine with 80 lbs compression. | ||
| View original record | x790. Wor/Mcr25/L16914. E. St Margarets. 16-9-14. In reply to your memo E1/B14914 Mr Hives informs us that the clearance volume of a Rolls-Royce engine with 80 lbs compression is 20.5 cubic inches. p.… | ||
| Scan032 | Telegram from Elliott requesting a wired reply from Hives regarding a previous note on compression volume. | ||
| View original record | Office of Origin: St margarets at cliffe To: Roycar Derby Message: Hives please wire reply to my note 21/1014914 re compression volumne Elliott X 790. Handed in at: 1.52 P.M Received here at: 2.34 P.M… | ||
| Scan033 | Confirmation of a telegram urging a reply to a note regarding 'compression volume'. | ||
| View original record | CONFIRMATION OF TELEGRAM. 17th September 1914. [STAMP: W. M. RECEIVED SEP 19 1914] [STAMP: RECEIVED SEP 1914] C.H. E1/B17914. To Wor. for EH. from E. We give below copy of telegram forwarded this… | ||
| Scan034 | Horsepower tests with varying engine compression and carburettor setups. | ||
| View original record | From Exp. Dept. Copies for:- J. R. E. Na. Re HP Tests and varying compressions. X.790 Attached herewith is a blue print showing the difference in HP and consumption we obtain by varying the lbs… | ||
| Scan035 | Engine modifications involving compression, Zephyr pistons, and their effect on power and fuel consumption. | ||
| View original record | Wor/EH4/L23215. 2. raising the compression 3 lbs. The range of compressions we used was limited by the skirt on the Zephyr pistons, the skirt would have come out in the counter-bore when using the low… | ||
| Scan036 | Graph of horsepower curves and fuel consumption differences at various engine compression levels. | ||
| View original record | BRAKE H.P. R.P.M. H.P. CURVES SHOWING DIFFERENCE IN H.P. BY VARYING COMPRESSION ONLY. TAKEN ON STANDARD R-R ENGINE, FITTED WITH STANDARD CARBURETTOR & INDUCTION PIPE. FREE EXHAUST & ZEPHYR PISTONS. A… | ||
| Scan037 | Engine horsepower test to determine the effect of compression leakage on power output. | ||
| View original record | From Exp. Dept. Copies for: J. R. E. Wa. Engine Horse Power Test. Why different cars vary in horse power is always cropping up. Although we are not in a position to say exactly why this happens the… | ||
| Scan038 | Engine performance, focusing on the effects of piston ring fitment, gas leakage, and friction on horsepower. | ||
| View original record | Wor/EH/L19515. 2. proportion to the speed of the engine and that a leakage that would appear tremendous when the engine was turned by hand would not make any appreciable difference in horse power at… | ||
| Scan039 | Page concluding that power loss from leakage is proportional to speed. | ||
| View original record | Wor/RH3/1.19515. 3. rings, and that the loss of power caused by leakage would always be in proportion to the speed. E.H. | ||
| Scan040 | Engine horsepower tests, leakage, and proposed experiments on induction systems. | ||
| View original record | C O P Y. To Wor. for EH from R. Copy to J. R5/IB21515. May 21st.1915. Re Engine Horse Power Test. Thank you for your report with reference to the leakage affecting the horse power of standard car and… | ||
| Scan041 | Possibility of 'ramming the induction' on an engine by coupling cylinders. | ||
| View original record | To Wor. for EH from R. COPY. 2. R5/IB21515. If one takes a single speed of, say 1600 on our aero or standard engine, couples three of the cylinders together, and brings a pipe of various lengths… | ||
| Scan042 | Record of engine compression experiments conducted at various speeds on a chassis. | ||
| View original record | R.R. 148 (20m) (P 548.10.10.10) G 1130. x490 Compression Experiments at various engine speeds. 4400 Engine speed 500 750 1000 1250 1500 1750 2000 2250 Compression lbs. 55 55 Too much vibration on… | ||
| Scan043 | Revisions and additions for the 'After the War Chassis', including a request for an American model. | ||
| View original record | To R. from. EH. Copy to BJ. " " Wor. " " EP. " " By. " " E. X 490 EH3/LG19.9.17. 19th Sept:1917. X.682. AFTER THE WAR CHASSIS. X.3185. It is now about 12 months since the points to be incorporated in… | ||
| Scan044 | List of technical recommendations regarding modifications to compression, shock absorbers, valves, wiring, and other vehicle components. | ||
| View original record | -2- attribute most of this due to increase in compression. On the old cars the amount of compression we could run with was decided by detonnations. 7.CA with the 4.33 compression ratio, does not… | ||
| Scan045 | Updating chassis 49.GE and the proposal to build a new 'after the war' chassis model. | ||
| View original record | -3- parts have been added, the frame, axle tubes, radiator, bonnet, and a large number of other parts are mostly out of date. X.1300. 49.GE. This needs a number of parts fitting to bring it up to… | ||
| Scan046 | List of decisions regarding parts to be incorporated into the post-war chassis. | ||
| View original record | R.R. 250 A (770 H) S.D. 442. 9-3-17) G. 1965 To R. from RH. Copy to BJ. " " Wor. " " Ep. " " Ry. " " E. x490 X.682. AFTER THE WAR CHASSIS. 256 It was decided on August 14/8/16 at a meeting of R, Wor,… | ||
| Scan047 | Page 2 of a numbered list detailing vehicle component specifications and modifications. | ||
| View original record | R.R. 235 A (770 H; S.D. 442. 9-5-17) G. 1905 -2-. 14. Self Starter six volts (afterwards changed to 12 volts.) 15. Lucas Dynamo to generate sufficient current for the lamp at 15 m.p.h. Belt pulley… | ||
| Scan048 | Use of aluminium pistons to increase the compression range on the 40/50 chassis. | ||
| View original record | R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X.790 EH1/LG18.2.19. To R. from EH. c. to CJ. c. to E. c. to Ey. c. to Da. RE 40/50 CHASSIS X.790. X.2748. X.2768 X.682 Previous to the war we used… | ||
| Scan049 | Modifications to the carburetter and camshaft for the 7 CA engine. | ||
| View original record | H.R. 233a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. -2- EH1/LG18.2.19. Contd. The carburetter on 7 CA has also been made larger. The low speed throat has been altered but the high speed throat has… | ||
| Scan050 | Inconclusive results of comparative tests on engine horsepower, consumption, and varying compressions. | ||
| View original record | EH. E.F.C. X.790 COPY. EP12/F13.11.19. X 790 X 3656 RE CONSUMPTION, HP, AND COMPRESSIONS. Although we have made comparative tests on the dynamometer and the road as regards HP and consumption with… | ||
| Scan051 | Peugeot and Duesenberg engine performance, focusing on compression and mean average pressure. | ||
| View original record | X.790. To SA. from R. Copy to CJ. " " Bn. " " PN. " " Hs. X.821. - Peugeot Car. X.490. Many thanks for your cutting re the Peugeot and Duesenberg. In the translation paragraph 3, there is a question… | ||
| Scan052 | Engine horsepower characteristics over a range of speeds, with a comparison to Peugeot and Duesenberg. | ||
| View original record | R.R. 199 (250T) (SD676 19-7-17) MP 180865 Contd. -2- R3/G18.5.20. R-R's are not high maximum H.P. so much as very good H.P. over a large range of speed, i.e. from 300 to 3000 revs. I suppose Peugeot… | ||
| Scan053 | Use of liners for chassis pistons. | ||
| View original record | Hs. from BY. c. EP. c. Da. c. Hm. gFE x.790 BY6/P11.6.20. CHASSIS - PISTONS. x.2748 Referring to Hs2/LG9.6.20., we have no objection in the works to do without a liner, but EP, was very strong on… | ||
| Scan054 | Use of liners with pistons to achieve low compression and address engine vibrations. | ||
| View original record | R.R. 199 (150T) (SD676 19-7-17) MP18086g X.790. BY. from EP. c. to Hs. c. to Da. [Struck through] c. to HM. EFC. [Handwritten] EP15/F11.6.20. X.2748 RE. CHASSIS PISTONS AND LINERS. X.790 With… | ||
| Scan055 | Directive to abolish the liner used with low compression pistons and to create a new piston. | ||
| View original record | X790 Mr. Shelton. from By. c. to Hs. c. to EFC. By/3/P16.6.20. X.2748. X.4146. CHASSIS - PISTONS. X.790. It has been decided by Conference that we shall abolish the liner used in conjunction with the… | ||
| Scan056 | Use of a liner for packing between the cylinder and crankcase to modify engine compression. | ||
| View original record | Hs. from BY. c. to EP. c. to Hm. S.F.C. COPY. X 790 BY1/F14.6.20. X.2748 [struck through] CHASSIS - CYLINDERS. RE PACKING BETWEEN CYLINDER AND CRANKCASE. X 790 Referring to my previous correspondence… | ||
| Scan057 | Confirming experiments to determine relative and hill-climbing speeds of cars with high and low compression. | ||
| View original record | To EH from DA. x790 DA3/CB20-11-19. In confirmation of our conversation yesterday I send you a copy of a note from BJ with reference to experiments to determine the relative max. speed and… | ||
| Scan058 | Conversion of low compression engines to medium compression for chassis. | ||
| View original record | Wor. from EP. c. to Hs. c. to BY c. to Sft. X790 EP/Thn1/H19.7.21. X.2565 RE. TESTING OF CHASSIS. X.1349 X.380 X.790 With reference to your memo. Wor5/M 8.7.21 attaching BJ's memo BJ22/H13.7.21, we… | ||
| Scan059 | Compression and axle gear ratios for the 40/50 model, distinguishing between open and closed cars. | ||
| View original record | To Hs. from R. c. to CJ. BJ. c. to WOr. BY. c. to EP. PN. X790 R2/M25.7.22. X.790. X.3426 X4299 I think Mr. Hives's memo. regarding the roughness of the present 40/50s is quite in accordance with my… | ||
| Scan060 | Engine performance, crankshaft deflection, and the importance of reducing vehicle weight. | ||
| View original record | contd:- -2- surprising that it is as quiet as it is, and wears as well, as between 2000 and 3000 revs. For such an engine is quite fast, and even light connecting rods, and aluminium pistons exert… | ||
| Scan061 | Complaints of vibrations on the 40/50 chassis and potential solutions. | ||
| View original record | To Hs. from BJ. c. to R. c. to CJ. Wor. BY. EP. Br. PN. X790 BJ13/H20.7.22 COMPLAINTS OF VIBRATIONS ON 40/50 CHASSIS. Hs1/LG19.7.22. X.634 X.790 X.4299. I was interested to read your report to R.… | ||
| Scan062 | Standardising cars with low compression and 14-tooth axles, balancing speed against vibration. | ||
| View original record | contd: -2- to decide on a policy of standardising cars with low compression and 14-tooth axles, which we hope will give adequate life, speed, silence, absence of vibration. When PN. returned from the… | ||
| Scan063 | From B.J. to Hs. requesting clarification on engine compression values and percentage reductions. | ||
| View original record | X790 To Hs. from B.J. URGENT. BJ12/H25.7.22. ENGINE COMPRESSION. X790 I am seeing C.J. to-morrow (Thursday) afternoon, on his return from abroad, to discuss a number of points, before I start for my… | ||
| Scan064 | From CJ to Hs. regarding the refusal to accept chassis with above-medium compression. | ||
| View original record | X790 To Hs. from CJ. Compression. CJ3/E27/7/22 Referring to R2/M25/7/22, I am taking this matter up with Mr.Royce. In the meantime please understand that we will not accept any chassis which are above… | ||
| Scan065 | Request for a non-technical explanation of the advantages of different engine compression levels. | ||
| View original record | X790 Tr8/DN/29.7.22. TO Hs. FROM Tr. X788 X790 ENGINE COMPRESSION. From the recent tests at Brooklands and any other experience, will you please let me know what advantage high compression engines… | ||
| Scan066 | Chasing a reply to a previous query regarding engine compression. | ||
| View original record | Tr1/HB/11.8.22. X790 From Tr. Hs. Engine Compression. I cannot trace having received a reply to my Tr8/DN/29.7.22, and shall be glad if you will let me have the information required. X790 Tr. X4305… | ||
| Scan067 | Requesting results of petrol consumption tests at Brooklands for different axles and engine compressions. | ||
| View original record | To Hs. from BJ. X790 BJ1/H15.9.22. BROOKLANDS TESTS. X.788. X.4299. X.3056. X.790 Confirming telephone message this morning, we hope that you will be able to send us the result of the petrol… | ||
| Scan068 | Viability of a deeper radiator and larger fan for engine cooling, referencing conditions in Switzerland and India. | ||
| View original record | X790 To Hs. from R. c. to CJ. c. to BJ. c. to BY. R2/M9.10.22. RE. SWITZERLAND AND INDIA X.3456 X.3438 X.790 As far as I am aware the 3" deeper (taller) radiator would be much overdoing it, and would… | ||
| Scan069 | Cover letter forwarding a document from America regarding 'Harsh Engines'. | ||
| View original record | X790 To === from BJ. c. to Hs. BJ/Py11/D21.11.22. Re: Harsh Engines. My dear R., I attach hereto copy of Oy4-W-11922 of the 9th inst., which has been received from America to-day. [STAMP: RECEIVED]… | ||
| Scan070 | Letter from the American branch to the London office discussing high compression engine noise, ignition issues, and modifications. | ||
| View original record | C O P Y. ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. Oy4-W-11922. November 9, 1922. Mr. Claude Johnson, Rolls-Royce Ltd., London, England. Attention of Mr. F. H. Royce. Mr. E. W. Hives. Dear Sir:… | ||
| Scan071 | Engine harshness, its causes in the induction system, and improvements from vaporizer pipes and compression changes. | ||
| View original record | -2- point than any American car, and was consequently run by most chauffeurs too far advanced for best power, but without showing much harshness in running. The 28 cu. in. engine requires more careful… | ||
| Scan072 | Letter from an engineer concluding a discussion on the benefits of vaporizer pipes. | ||
| View original record | -3- The vaporizer pipes reduce roughness in cars of medium compression, and increase power without producing roughness in cars of exceedingly low compression. Yours truly, ROLLS-ROYCE OF AMERICA INC.… | ||
| Scan073 | Piston design and compression ratio for the 'Hawk-Northcliffe' chassis. | ||
| View original record | To R. from Hs. X790 hs4/LG1.1.23. X3408 X3773 X790 PISTONS ON "HAWK-NORTHCLIFFE". The pistons on the above Chassis are similar in design to the 40/50 HP. They are the split type with 4 rings. The… | ||
| Scan074 | The 5-Goshawk-11 car with Gwynne all-weather body, detailing its silent performance and discussing potential modifications. | ||
| View original record | To BJ. from R. c. to CJ. LHS. c. to BY. Wor. c. to Hs. EP. c. to E. Da. X790 R11/M19.1.23. GENERAL X.4219 X.4256 X.790. From 5-Goshawk-11 (Gwynne all-weather body) I have concluded that the back axle… | ||
| Scan075 | Series of graphs comparing engine performance characteristics for high and low compression engines. | ||
| View original record | Graph 1 (Top Left): ENERGY DIAGm. 40-50 R.R. COMPn RATIO 4.4 SEE SHEET 1. Y-Axis: % OF INITIAL PETROL ENERGY. X-Axis: R.P.M Legend: LOSSES THRO' -, COOLING WATER, EXH. GASES, RADIATION, CHARGING WK.,… | ||
| Scan076 | Table detailing specifications for car engines, including bore, stroke, displacement, clearance volume, and compression ratio. | ||
| View original record | CAR ENGINES. X790 17/10/23 Engine. | Bore. | Stroke. | Displacement. | Clearance volume. | Compression ratio. 20 HP. | 3 | 4 1/2 | 31.809 cu.ins. | 8.787 cu.ins. | 4.618 40/50 HP. High comp: | 4 1/2 |… | ||
| Scan077 | Engine compression ratios and the effect of fuel quality in France on engine detonation. | ||
| View original record | X.790 Extract from R3/M9.2.24. E. A. C. ENGINE. X.9770 X.9680 COMPRESSION. X.790 I certainly agree that the lower 4.3 will be preferable; fuel in France makes an engine detonate much worse than the… | ||
| Scan078 | Disadvantages of high compression ratios, such as detonation and vibration, and proposing double battery ignition. | ||
| View original record | To E. from R. To HS. c. to CJ. RG. DA. PN. BY. *790 S E C R E T. R3/M10.3.24. E.A.C. 2.3.5 & 5. X.790 X.9550 X.9780 High compression ratios and compression pressure have two diadvantages :- (a)… | ||
| Scan079 | Optimal cylinder compression capacity for the 40/50 engine, comparing Derby and Springfield practices. | ||
| View original record | RECEIVED AH EM c. Hs. GMBY C.SPT. x790 EP13/Hl.5.24. re. 40/50 Cylinder Compression Capacity. The compression capacity of the engines now being received on test appears to be slightly less than it… | ||
| Scan080 | Secret memo suggesting an increase in the compression ratio for the EAC engine to gain extra power. | ||
| View original record | X. 790 To Hs. from R. c. tp CJ. BY. S E C R E T. R8/M6.10.24. E.A.C.11. COMPRESSION RATIO. X.790. Since we have now got the EAC. engine so very smooth, I should favour another quarter on the… | ||
| Scan081 | Experiments with compression ratio and exhaust systems on a 20 HP engine. | ||
| View original record | To R. From HS/AGL. C. to Mr. Cox. C. to Mr. Hives. C. to Mr. Wormald. X790 Hs/ACLL/LG1.5.26. EXPERIMENTS WITH COMPRESSION RATIO AND EXHAUST SYSTEM ON 20 HP. ENGINE. X5230 X790 The following report… | ||
| Scan082 | Engine performance comparing different compression ratios, focusing on power output and detonation. | ||
| View original record | contd :- -2- We have appended curves which shew both the power output with the high ratio and the present standard (sheet 1) and in addition a third curve is plotted giving the brake horse power… | ||
| Scan083 | Testing a piston with a deep concave head to improve combustion turbulence and reduce detonation in a Phantom engine. | ||
| View original record | contd :- -3- Another type of piston was tried of approximately the same ratio (5.35) in which an endeavour was made to obtain a more compact combustion space. The piston had a deep concave head and it… | ||
| Scan084 | Power loss analysis due to various parts of the exhaust system. | ||
| View original record | contd :- -4- POWER LOSS DUE TO VARIOUS PARTS OF THE EXHAUST SYSTEM. A series of tests were undertaken to determine the power absorbed by the various components of the exhaust system and to see if… | ||
| Scan085 | Experiments with low loss manifolds and silencer systems to reduce back pressure. | ||
| View original record | contd :- -5- meet at a high velocity and so loose any advantage, in scavenging, they may possess due to their kinetic energy. In the experimental manifold it would seem that the k.e. assists in… | ||
| Scan086 | Graph of power output against RPM for a 20-HP engine with various exhaust system configurations. | ||
| View original record | 20-HP. ENGINE - POWER OUTPUT WITH VARIOUS PARTS OF THE EXHAUST SYSTEM STD ENGINE 4.75/1 COMPn RATIO. BAR 758 M.M. TEMP. 19°C (AIR) B.H.P. R.P.M. SHORT OPEN EXH. PIPES MANIFOLD WITH OPEN END EXHAUST… | ||
| Scan087 | Graph of engine power output (B.HP) against engine speed (R.P.M.) for a 20 HP engine, comparing standard and increased compression ratios. | ||
| View original record | 20 H.P ENGINE - POWER OUTPUT WITH INCREASED COMPRESSION RATIO CORRECTED FOR BAR 760 m/m AIR 12°C B.H.P. R.P.M. 5.45 TO 1 COMPn RATIO CALCULATED FOR 5.45/1 RATIO STD COMPn RATIO 4.75 TO 1 CAC/L 1/5/26 | ||
| Scan088 | Blueprint for an experimental 20-HP exhaust manifold. | ||
| View original record | LEAD IN AT ABOUT 30°, 30°, 1.500 DIA, BRANCH PIPES INCR TO 1.500 DIA WHERE THEY MERGE INTO DOWN PIPE, INTERNAL DIA 2.000, TO SILENCER ->, EXPL. 20-HP EXHAUST MANIFOLD, ARH, 1/5/26 | ||
| Scan089 | Modifications to the Lighter Phantom Engine, including changes to the crankcase, pistons, and connecting rods. | ||
| View original record | BY. HS. } FROM R & E. c. to BJ. Wor. OY. 4790 R4/M7.6.26. LIGHTER PHANTOM ENGINE. X.7770 EAC.7. & 9. X.7840 X.790 Since it may be some time before we have a new crankcase for the Phantom engine I… | ||
| Scan090 | Car acceleration, comparing various models and the effect of axle and compression ratios. | ||
| View original record | Y790 19.11.26. FUNDAMENTALS OF CAR PERFORMANCE. X1725 X4572 ACCELERATION. The question sometimes arises as to the relative performance of various R-R models - also the effect of axle ratio and… | ||
| Scan091 | Two acceleration graphs, one comparing a Rolls Royce Phantom to a Bentley, and the other comparing different axle ratios on a Phantom. | ||
| View original record | ACCELERATION ROLLS ROYCE V BENTLEY VELOCITY M.P.H. TIME SECONDS. 6 1/2 LITRE BENTLEY 10 E.X. 15 TOOTH AXLE STANDARD PHANTOM. ACCELERATION HIGH V LOW AXLE RATIO VELOCITY M.P.H. TIME SECONDS. AXLE RATIO… | ||
| Scan092 | Blank document with a Print Room stamp from Derby. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 16 NOV. 1926 DERBY | ||
| Scan093 | Two graphs comparing vehicle acceleration performance, one for high vs low compression ratios and the other for the 20 HP vs 40/50 models. | ||
| View original record | Top Graph: ACCELERATION HIGH V LOW COMPRESSION RATIO 40/50 VELOCITY M.P.H. TIME SECONDS Legend: Solid Line: 10 E.X. WT. EMPTY 2.27 TONS COMP. RATIO 5/1 Dashed Line: 98 N.K. WT. EMPTY 2.34 TONS COMP.… | ||
| Scan094 | Two graphs showing acceleration performance comparisons for standard and high compression 20 HP engines. | ||
| View original record | Top Graph: ACCELERATION ACCELERATION FT/SEC/SEC ROAD SPEED M.P.H. LEGEND: HIGH COMP. 20 H.P HIGH COMP. 20 H.P. CUT OUT OPEN STANDARD 20 H.P. Bottom Graph: ACCELERATION HIGH V LOW COMPRESSION RATIO 20… | ||
| Scan095 | Blank page with a Print Room stamp. | ||
| View original record | ROLLS-ROYCE LIMITED. PRINT ROOM 18 NOV. 1926 DERBY | ||
| Scan096 | Ricardo's latest paper on petrol engine development and its views on compression ratio and harshness. | ||
| View original record | S/W. Hs. K790 CWB4/GM/23-2-27. Would you please send on to me the large envelope with papers which I left on your table last night. I was much interested in certain points of Ricardo's latest paper on… | ||
| Scan097 | Responding to Ricardo's remarks on high compression causing engine roughness and its effect on detonation. | ||
| View original record | To CWB. from Hs. +790 Hs5/LG24. 2. 27. (3867) Replying to CWB4/GM23.2.27. We consider Ricardo's remarks on high compression causing roughness are perfectly logical. One would imagine that the rate of… | ||
| Scan098 | Analysis of a Lorraine Dietrich engine to identify potential improvements for the 20 HP engine's power development. | ||
| View original record | x790 To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. Hs/ACLl/LG1.4.27. X5771 X3555 20 HP. RR. POWER DEVELOPMENT EXPERIMENTS. When ak analysing the results of tests made on the Lorraine… | ||
| Scan099 | Report page detailing comparative tests of larger diameter valves and Zenith carburettors against standard components. | ||
| View original record | contd :- -2- ation in this direction. We considered that the larger diameter valves, in order to make a true comparison with those of the std. dimensions, should be tested in conjunction with carbs.… | ||
| Scan100 | Increased engine power with lower induction pipe depression and different carburetors. | ||
| View original record | contd :- -3- INCREASED POWER WITH LOWER INDUCTION PIPE DEPRESSION. Referring to the first set of results taken which are given on Print No.1. we have the power output with the std. cyl. head for the… | ||
| Scan101 | Engine power increases achieved through modifications to valves and carburetters. | ||
| View original record | contd :- -4- We have observed that the power increase is just what would be expected from the reduction in depression. The maximum power - at 2750 r.p.m. - has been increased from 58 to 63 B.HP. or… | ||
| Scan102 | Report page comparing engine performance based on compression ratios, carburetters, valves, and ignition systems. | ||
| View original record | contd :- -5- On Print No.4. is shewn the power output as obtained above with the two carburetters, large valves and the 5.45/1 comp: ratio compared with a standard Goshawk of 4.75 to 1 comp: ratio.… | ||
| Scan103 | Summary of test conclusions for increasing the power of a 20 HP engine by modifying carburetors, valves, and compression ratio. | ||
| View original record | contd :- -8- SUMMARY AND CONCLUSIONS. The tests have proved particularly encouraging in shewing us that we can increase the power of the existing 20 HP. to the extent estimated from the Lorraine by :-… | ||
| Scan104 | Proposal to test a 6/1 compression ratio on the 20 HP engine to match the specific output of the Lorraine engine. | ||
| View original record | contd :- -7- We also intend testing a 6/1 compression ratio in order to determine if the specific output of the 20 HP. RR. can be equal to that of the Lorraine. The results and information obtained… | ||
| Scan105 | Graph showing the power increase due to lower depression in the induction pipe for a 20hp engine. | ||
| View original record | 20HP POWER INCREASE DUE TO LOWER DEPRESSION IN INDUCTION PIPE ENGINE No 11-GII. COMPRESSION RATIO = 5.45 to 1. OPEN EXHAUST. CURVES CORRECTED TO N.T.P. B.H.P. STD. 20HP CARB. ZENITH TRIPLE VENTURI… | ||
| Scan106 | Blank page with a purple date stamp from Derby. | ||
| View original record | D 1 APR 1927 DERBY. | ||
| Scan107 | Graph showing the power increase in a 20 HP engine due to using larger valves. | ||
| View original record | 20 H.P. POWER INCREASE DUE TO LARGER VALVES. ENGINE No 11-GII. COMPRESSION RATIO = 5.45 to 1 OPEN EXHAUST. TWO ZENITH TRIPLE VENTURI HORIZONTAL CARBURETTERS. CORRECTED TO N.T.P. 31-3-27 B.H.P LARGE… | ||
| Scan108 | Performance graph comparing standard vs. larger valves on a 20 HP engine. | ||
| View original record | 20 H.P. POWER INCREASE DUE TO LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE. ENGINE No 11-GII COMPRESSION RATIO = 5.45 to 1. OPEN EXHAUST. CORRECTED TO N.T.P. 31-3-27 BRAKE HORSE POWER… | ||
| Scan109 | Graph comparing Brake Horse Power and Brake Mean Effective Pressure of a standard 20HP engine against a modified version. | ||
| View original record | 20HP POWER INCREASE DUE TO HIGHER COMPRESSION RATIO, LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE. ENGINE N° 11-GII. OPEN EXHAUST CORRECTED M.T.P. BRAKE HORSE POWER B.H.P. B.M.E.P.… | ||
| Scan110 | Stamped cover page from the Derby works. | ||
| View original record | 1 P.INT.ROOM 1 APR 1927 DERBY. | ||
| Scan111 | Graph comparing gas velocity past standard and larger valves against engine RPM for a 20 HP engine. | ||
| View original record | 5 20 H.P. GAS VELOCITY PAST VALVES. INLET AREA PAST VALVES:- STANDARD VALVES = 1.04 SQ. INS. LARGE VALVES (1.400 DIA") = 1.48 SQ. INS. STANDARD VALVES. LARGER VALVES. GAS VELOCITY (FEET PER SEC)… | ||
| Scan112 | Blueprint showing the arrangement of two Zenith carburettors on the 20 HP engine. | ||
| View original record | 6, SHORT EXH PIPES., HORIZONTAL ZENITH TRIPLE DIFFUSER CARB, ARRANGEMENT OF THE TWO ZENITH CARBURETTERS ON THE 20.H.P., EXH. PORTS, INLET MANIFOLDS, FLANGES FOR THE TWO ZENITH CARBS. | ||
| Scan113 | Page with a purple ink stamp in the bottom right corner, the main text is illegible. | ||
| View original record | PRINT ROOM 1 APR 1927 DERBY | ||
| Scan114 | Delivery of the 14-EX car and altering the engine compression ratio. | ||
| View original record | SC. from Hs. X790 Hsl/LG10.5.28. 14-EX CAR. X7770 With reference to Sgll/MD.5.28. This car will be in London on Tuesday the 15th. and you can keep it as long as you wish. We should like instructions… | ||
| Scan115 | Revisions to the EAC.7 engine with dry and wet liners and requesting compression ratio information. | ||
| View original record | To Hs. from E. c. to BY. X790 E1/M24.5.27. RE. EAC. 7. X.7770 X.790 X.7050 We are pushing on with a revised engine having a 9" high crankchamber, and cyl. blocks fitted with dry liners, as it is not… | ||
| Scan116 | Recommending an increased compression ratio for general purpose cars using an aluminium engine. | ||
| View original record | To E. from Hs. X790 Hs2/LG27.5.27. EAC-7 - COMPRESSION RATIO. X770 On the aluminium engine with the anti detonating head, we are running with a compression ratio of 4.6 to 1. We recommend for general… | ||
| Scan117 | Power and compression ratios for the F.2.B. series engine. | ||
| View original record | BJ: from Hs. c. to Wor. c. to CWB. c. to C. PN. EP. MX. X790 Hs3/LG7.6.28. POWER - F.2.B. SERIES. X790 X7770 X7771 X87708 We do not anticipate that there will be any appreciable increase in power on… | ||
| Scan118 | Confirming the policy that compression ratios on F.2.B. Series chassis will not be raised for customer delivery without testing by Sales officials and personal sanction. | ||
| View original record | Hs 4790 To Hs. from BJ. c. to Wor. PN. CWB. BP. C. Mx. Power - F.2.B. Series. BJ1/ES.6.28 In regard to the third paragraph of your Hs3/LG7.6.28, I presume it is clear to all that the compression ratio… | ||
| Scan119 | Compression pressure test results for engine No. SS-3 at various RPMs. | ||
| View original record | To R. from HS/ACL. c. to BJ. Wor. c. to E. DA. c. to BY. X790 SECRET. HS/ACL1/LG28.9.28. 'SS' ENGINE. X7770 Engine No. SS-3. Total running time to date = 38 1/4 hrs. Running conditions. Claudel Hobson… | ||
| Scan120 | Engine noise investigation, covering piston knock, rocker mechanism, timing gears, and valve mechanism issues. | ||
| View original record | CONTD :- -2- small elbow fitted on to the induction pipe. This change has been made in order that the mechanical noise of the engine could be studied more carefully: The Claudel carburetter making so… | ||
| Scan121 | Graph of compression pressures for a Super Sports Engine at various RPMs. | ||
| View original record | V4 COMPRESSION PRESSURES (SUPER SPORTS ENGINE). ENGINE Nọ SS-3. (COMPRESSION RATIO. 4·5). CLAUDEL-HOBSON CARBURETTOR. HOT-SPOT IN ACTION (WATER @ 75°C). 116° CAMSHAFT. FULL BED EXHAUST SYSTEM FULL… | ||
| Scan122 | Blank document with a Print Room date stamp. | ||
| View original record | ROLLS-ROYCE, LIMITED PRINT ROOM. 28 SEP 1928 DERBY | ||
| Scan123 | Graph showing Mechanical Efficiency and Friction Horse Power against R.P.M. for the Super Sports Engine No SS-3. | ||
| View original record | MECHANICAL EFFICIENCY (SUPER SPORTS ENGINE), ENGINE No SS-3, PERCENTAGE MECHANICAL EFFICIENCY., HORSE POWER., R.P.M. OF ENGINE., MECH. EFF'CY, FRICTION H.P., V432, 25-9-28, 100%, 90%, 80%, 70%, 30,… | ||
| Scan124 | On engine compression experiments, torque reactions, and carburettor improvements for the EAC.10 chassis. | ||
| View original record | E. Hs. from R. BY. c. to BJ. Wor. x790 R1/M17.10.28. EAC.10. (SS) RE. COMPRESSION. X.790 X.7080 X.7005 X.7771 In our experiments we should use the highest compression that the engine will bear without… | ||
| Scan125 | Issue of 'booming bodies' in limousines, potential solutions, and the impact of the turbulent head. | ||
| View original record | Hs. from R. c. to BJ. SG. c. to DA. E. c. to BY. C. c. to PN. CWB. x790 RL/M12.11.28. BOOMING BODIES - TURBULENT HEAD X.790 AND COMPRESSION RATIO. X.7830 X.8830 X.5830 I have enquired into the… | ||
| Scan126 | Modifications and performance of the 20 HP car 14-G4. | ||
| View original record | To R. from Hs. c. to SG. Wor. c. to E. DA. c. to EY. X790 Hs2/LG23.3.29. 20 HP. CAR. X218 X5771 We have now got the 20 HP. car 14-G4 (the latest type) completed. We have removed the cross and fitted… | ||
| Scan127 | Modifying the India 1V engine cylinder head to address pre-ignition problems by altering the compression ratio. | ||
| View original record | Hs/ACL1/LG28.3.29. INDIA 1V - ENGINE COMPRESSION RATIO AND PRE-IGNITION. The original India 1V. cyl. head gave a compression ratio of 3.6/1 and with this we experienced considerable trouble both on… | ||
| Scan128 | Preignition issues, comparing the water cooling properties of cast iron and aluminium cylinder heads. | ||
| View original record | contd :- -2- The standard water pump admitting water to the cyl. blocks was retained. It was thought that if the trouble was due to hot spots at some part of the head, or inadequate cooling of the… | ||
| Scan129 | Engine preignition issues at a specific compression ratio and proposed testing methods. | ||
| View original record | contd :- -3- At the moment we can say that we cannot operate with a compression ratio of 5.6/1 due to preignition troubles. We are combining experiments and are arranging thermo couples attached to… | ||
| Scan130 | Comparison of performance data for two cars during various hill climbs. | ||
| View original record | Weight of both cars : 33 cwts. 3 qsr. 19" wheels. 11/50 axle on each car. 12.G.1V. 14.G.1V. STANTON HILL. Start 10 m.p.h. 10 m.p.h. Finish 19 m.p.h. 22 m.p.h. Time 32 secs. 31 secs. TICKNALL HILL.… | ||
| Scan131 | Ignition plug temperature, pre-ignition, and cooling issues on a 20 HP engine. | ||
| View original record | R. from E. c. to SG. Hs. BY. X790 E1/M10.4.29. INDIA 4. - COMPRESSION RATIO & PREIGNITION. X.790 X.1812 Hs/ACL1/LG28.3.29. X.5970 X.5050 (1) HIGHER TEMPERATURE OF IGNITION PLUGS. Regarding the… | ||
| Scan132 | Proposed engine modifications regarding compression ratios, spark plug cooling, and ignition timing. | ||
| View original record | contd :- -2- With the proposed reduction in the India 4. compression ratio however there is a distinct opportunity of considerably improving the water cooling of the plug. We propose to add .125"… | ||
| Scan133 | Conclusions from a cylinder head test regarding hot spots, compression ratios, and ignition plugs. | ||
| View original record | contd :- -3- CONCLUSIONS : (1) It is suggested that there is a definite hot spot immediately under the plug on the actual cyl. XX head tested. (2) It is proposed to modify the combustion chamber to… | ||
| Scan134 | Tests regarding pre-ignition trouble on an India-4 turbulent head by comparing cylinder head temperatures. | ||
| View original record | To R. from Hs/ACL. c. to SG. Wor. c. to E. DA. c. to BY. 4790 Hs/ACL1/LG18.4.29: X218 X1643 X790 INDIA 1V - COMPRESSION RATIO AND PRE-IGNITION. We have made some further tests regarding the… | ||
| Scan135 | The effects of pre-ignition on Dadia IV and cast iron engines, comparing turbulent and cast iron cylinder heads. | ||
| View original record | contd :- -2- temperatures very near that of the bronze inserted plug seats. Effect of pre-ignition on Dadia 1V. and cast iron engine. When the turbulent head engine with 5.6 : 1 comp: ratio is opened… | ||
| Scan136 | Spark plug suitability for high compression engines and issues with pre-ignition. | ||
| View original record | contd :- -3- 2500 r.p.m. to give maximum power while the cast iron head needs approx. 43° advance. The fact that the non-turbulent head requires earlier timing of the spark and consequently has slower… | ||
| Scan137 | Summary of engine tests comparing aluminium and cast iron cylinder heads, focusing on temperature, pre-ignition, and compression ratios. | ||
| View original record | contd :- -4- We have not been troubled with oil fouling the plugs on this engine so can therefore select a cooler running plug. SUMMARY. (1) We have shewn that the plug bosses in the alum. head are a… | ||
| Scan138 | Diagram showing the position of thermocouples in an India IV cylinder head. | ||
| View original record | V623. STD. COPPER ASBESTOS WASHER BETWEEN PLUG AND THERMO COUPLE THERMO COUPLE IN CONTACT WITH BRONZE PLUG, BUSH LEAD TO GALVANOMETER INDIA IV CYL. HEAD - POSITION OF THERMO COUPLES. 21/4/29 | ||
| Scan139 | Heavily faded and almost entirely illegible document page with a purple date stamp. | ||
| View original record | Illegible text. Stamped text: ROLLS-ROYCE, LIMITED PRINT ROOM, 18 APR 1929 | ||
| Scan140 | Surprisingly low performance improvements of a 20 HP engine fitted with a new Turbulent Head. | ||
| View original record | SG. from R. c. to Wor. Hs. BY. c. to E. PN. C. EP. 4790 RL/M22. 4. 29. 20 HP. TURBULENT HEAD ETC. X. 5050 X. 790 X. 5770 I am somewhat surprised that no definite improve-ment was found between London… | ||
| Scan141 | Performance analysis of a 20 HP engine with a new turbulent head, comparing compression ratios and power increases. | ||
| View original record | R. from E. x790 E1/M26. 4. 29. c. to SG. Wor. PN. c. to Hs. BY. "20 HP" PERFORMANCE. X.5770 X.5050 X.790 X.1725 The present standard compression ratio is 4.8 to 1. The turbulent head as tested for… | ||
| Scan142 | Implementation of two compression ratios and improvements to the SS chassis. | ||
| View original record | X 740 Hm. from R. SECRET. R3/M29.5.29. C. to Sg. Hs. Wor. E. X 740 X 8040 40/50 - TWO COMPRESSION RATIOS I appreciate your memo. Hm5/W27.5.29. The trouble with two compression ratios as standard is… | ||
| Scan143 | Engine specifications including timing, power curve data, compression ratio, and clearance volume. | ||
| View original record | To EP. from Hs/Gy. X490. Hs/Gyl/MJ.11.7.29. Re. S.S. X1440 X928 X490. X381. (1) Std. Valve Timing. We attach print V.527, Standard Valve Timing. (2) Std. Ignition Timing. This is 12° before T.D.C.… | ||
| Scan144 | Measuring the S.S. combustion space clearance volume and calculating the compression ratio. | ||
| View original record | To Ey. From Hs/ACL C. to E. Mr. C. to EF Mr. X490. Hs/ACL3/WJ.15.7.29. X4440 X490 S.S. COMBUSTION SPACE. ------------------------- We find the only accurate way to measure the clearance volume of the… | ||
| Scan145 | Testing a reduced compression ratio in an S.S. car engine for smoother operation. | ||
| View original record | SECRET. X790 R. from Hs. c. to Sg. Wor. E. Da. By. Hs5/MJ17.7.29. X7770 X790. S.S. CARS. We have tried one of the Expl. cars with the compression ratio reduced to the same as the standard Phantom… | ||
| Scan146 | Compression ratio tests and findings on test bed engines. | ||
| View original record | X790 To E. from Hs/Rm. Hs/Rm.7/AD.9.9.32. JAPAN 3. COMPRESSION RATIO X5050 All the cylinder heads we have had on our test bed engines have been to drawing E.57126. The volume of this cylinder head is… | ||
| Scan147 | Comparative table of compression ratios and maximum brake horsepower for various car models from 1927 to 1929. | ||
| View original record | x790. (There is an average increase of 10 lbs. per sq.in. compression pressure in the last year for a given compression ratio due to better piping and valving etc. This also increases the tendency to… | ||
| Scan148 | Comparative table of engine specifications (B.HP and Compression Ratio) for various car models from 1927 to 1929. | ||
| View original record | -2- Make & Model 1927 1928 1929 B.H.P. Comp.Ratio B.H.P. Comp.Ratio B.H.P. Comp.Ratio Stand Op. Stand Op. Stand Op. Essex. 6 4000 5.20 55.3600 5.80 Falcon. 46-3000 4.6 45-3000 5.50 Ford. A 20-1600 3.6… | ||
| Scan149 | Comparative table of B.HP and Compression Ratios for various car makes from 1927 to 1929. | ||
| View original record | -3- | Make & Model. | 1927 | 1928 | 1929 | |---|---|---|---| | | B.H.P. | Compr.Ratio Stand. Op. | B.H.P. | Comp.Ratio Stand. Op. | B.H.P. | Comp.Ratio Stand. Op. | |---|---|---|---|---|---|---| |… | ||
| Scan150 | Cover note for sketch Hs.747 detailing a modification to the cylinder head compression ratio for the Peregrine engine. | ||
| View original record | PEREGRINE Files. x/90 29.10.32. The attached sketch Hs.747 shows a means of altering the compression ratio of cylinder heads to E.100578 from 6.5/1 to 6.0/1 and which will be used on the first… | ||
| Scan151 | Modification drawing for a cylinder head to reduce the compression ratio. | ||
| View original record | HS 747 MODIFICATION TO CYL. HEAD ALREADY MADE MACHINE TO THESE DIMENSIONS. OTHER DIMENSIONS SEE (E100578) 1.00 RAD 2.825 3.000 REDUCTION OF COMPRESSION RATIO FROM 6.5 TO 6.0 : 1 MACHINE TOP FACE AND… | ||
| Scan152 | Heavily faded and damaged document with a purple ink stamp from the Print Room. | ||
| View original record | ROLLS-ROYCE, LTD. PRINT ROOM OCT 29 1932 DERBY. | ||