Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Technical memo discussing new engine timing and modifications for the Bensport power unit. | ||
| View original record | HS. } FROM R. E. } X207 R3/M17.1.33. Sent off 23.1.33. C. to SG. WOR. RG. BY. BENSPORT I am very pleased to hear that you are getting on so well with Bensport power unit, (and the car also, which has… | ||
| scan0002 | Request to manufacture a new camshaft for the Bensport Unit by scaling down existing 'R' engine cam designs. | ||
| View original record | RIC. from Hs/Gry. X207 Hs/Gry.13/KT.21.3.33. 'R' CAM FORMS FOR BENSPORT. We expect by this means to get the maximum power from the Bensport Unit. In order to be able to insert the camshaft the overall… | ||
| scan0003 | Requirement of a new cam form for a Bensport Camshaft on the 'R' engine. | ||
| View original record | X20J. RHC. from Hs/Gry. Hs/Gry.3/KT.3.4.33 BENSPORT CAMSHAFT. We will require a new cam form to use the 'R' engine shaft for this engine; we should prefer the attached camshaft Hs.971. The… | ||
| scan0004 | Blueprint showing camshaft timing, dimensions, and cam lift data. | ||
| View original record | Hs 971 CAM LIFT OPENING TABLE: DIV | CAM LIFT OPENING 0 (arrow to 37) | SEE E59272 38 | .32600 39 | .32600 40 | .32600 CAM LIFT CLOSING TABLE: DIV | CAM LIFT CLOSING 81 | 0 n | SEE 41 | Div n-3 72 |… | ||
| scan0005 | The incorrect timing of a Bensport J.1 camshaft balancing cam and requesting a drawing alteration. | ||
| View original record | X207 To E: from Hs/FJH. Hs/FJH.6/KT.4.9.33. CAMSHAFT BALANCING CAM - BENSPORT J.1. The timing of the above cam, as given on LeC.3563, is incorrect. For the timing to agree with the calculated… | ||
| scan0006 | Correcting the angle on a Bensport Balancing Cam drawing. | ||
| View original record | x207. To Mr.Wakefield. Hs/FJH:5/KT.11.9.33. BENSPORT BALANCING CAM. Will you please note than the angle between the keyway and the centre line of the above cam should be 36o and not 35o as shown on… | ||
| scan0007 | Drawing for an increased oil well in the Bentley Balancing Cam housing. | ||
| View original record | To BY. from E/JNR. V207 E/JNR.1/HP.30.9.33. c. Hs. Sft. RHC. re Bentley Balancing Cam. We send you herewith a drawing: LeC.3658 shewing the oil well of the balancing cam housing increased in size to… | ||
| scan0008 | Valve gear noise, automatic tappet adjustment, and potential camshaft modifications. | ||
| View original record | x207 To Sg. from Hs/Rm. C. Wor. E. C. By. EH. C. Rn. Hs/Rm.2/ET.11.12.33. xrsqu VALVE GEAR NOISE. In view of the general concern regarding the silence of R.R. valve mechanism, we have carried out… | ||
| scan0009 | Investigation into the cause of Bentley tappet noise and various attempts to reduce it. | ||
| View original record | To Ag. From Hs/FJH. c.c. Wor. E. c.c. By. Bn. c.c. Ev. Hs/FJH.11/KT.11.12.33. BENTLEY TAPPET NOISE. The first part of this investigation consisted of attempts to reduce the tappet noise on the Bentley… | ||
| scan0010 | Analysis of valve and cam operation to determine velocities for quiet engine performance. | ||
| View original record | -2- The noise due to the impact of the valve on its seat should be proportional to the velocity of impact, the mass of the valve, cap, and cotters, and the rigidity of the seat in the cylinder head.… | ||
| scan0011 | Analysis of cam contours, clearances, and their effect on tappet noise and valve velocity. | ||
| View original record | -3- Hs/FJH.11/ET.11.12.33. If the cams conformed perfectly to leC.3292 these velocities would correspond to clearances of 0.004" and 0.0075" respectively. Assuming a limit of accuracy of .002" for the… | ||
| scan0012 | Table of maximum clearances and velocities for quiet cam operation for Cylinders No.1 and No.2. | ||
| View original record | SHEET 1. | CAM. | | MAX. CLEARANCE FOR QUIET CLOSING INCHES. | CLOSING VELOCITY INS/DEGREE. | MAX. CLEARANCE FOR QUIET OPENING INCHES. | OPENING VELOCITY INS/DEGREE. | |---|---|---|---|---|---| | Cyl… | ||
| scan0013 | Graph of valve lift against crankshaft degrees for a Bentley No.1 cylinder inlet cam. | ||
| View original record | BENTLEY CAM TOES UNIT B.Y. No.1 CYL. INLET CAM CAM'S MADE TO LIFT CURVE L.E.C. 3292. DOTTED CURVE SHOWS TOES TO L.E.C. 3292. VALVE LIFT CLOSING TOE OPENING TOE MAX CLEARANCE FOR QUIET OPENING MAX… | ||
| scan0014 | Blueprint graph detailing the performance of Bentley Cam Toes, plotting valve lift against crankshaft degrees. | ||
| View original record | BENTLEY CAM TOES UNIT B.Y. No. 1 CYL. EXHAUST CAM CAMS MADE TO LIFT CURVE LEC 3292 DOTTED CURVE SHOWS TOES TO LEC 3292 AXIS LABELS: VALVE LIFT - INCHES CRANK SHAFT DEGREES CURVE LABELS: CLOSING TOE… | ||
| scan0015 | Blueprint graph showing valve lift characteristics against crankshaft degrees for Bentley Cam Toes. | ||
| View original record | BENTLEY CAM TOES. UNIT B7. No 2 CYL. INLET CAM. CAMS MADE TO LIFT CURVE LEC 3292. DOTTED CURVE SHOWS TOES TO LEC 3291. VALVE LIFT - INCHES. CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX. CLEARANCE… | ||
| scan0016 | Graph plotting valve lift against crankshaft degrees for Bentley cam toes on a B7 No.2 cylinder exhaust cam. | ||
| View original record | BENTLEY CAM TOES UNIT B7 NO2 CYL. EXHAUST CAM CAMS MADE TO LIFT CURVE LEC 3292. DOTTED CURVE SHOWS TOES TO LEC 3292. VALVE LIFT - INCHES. CRANKSHAFT DEGREES. CLOSING TOE OPENING TOE MAX. CLEARANCE FOR… | ||
| scan0017 | Blueprint graph of Bentley cam base circle contours for Unit B7. | ||
| View original record | BENTLEY CAM BASE CIRCLE CONTOURS. UNIT B7 CAMS MADE TO LIFT CURVE LEC 3292. No.1 CYL. INLET. No. 2 CYL. INLET. No. 1 CYL. EXHAUST. No. 2 CYL. EXHAUST. VALVE LIFT - INCHES CRANKSHAFT ANGLE - DEGREES.… | ||
| scan0018 | Graph comparing standard and suggested Bentley cam toe profiles, lift, and velocities against crankshaft degrees. | ||
| View original record | BENTLEY CAM TOES. Y-AXIS (LEFT): VALVE LIFT - INCHES. Scale: 0, 0.005, 0.010, 0.015, 0.020. X-AXIS: CRANKSHAFT DEGREES. Scale: 0, 5, 10, 15, 20, 25, 30, 35, 40. Y-AXIS (RIGHT): VALVE VELOCITY - INCHES… | ||
| scan0019 | Request to put in hand a camshaft to drawing Hs.1260 for slow running experiments on a Test Bed engine. | ||
| View original record | X 207 To HHC. from Hs/Gry. Hs/Gry.5/KW4.1.34. Will you please put in hand a cam shaft to the attached Hs.1260. We require this in connection with slow running experiments, and should like to fit it to… | ||
| scan0020 | Letter from Rudge-Whitworth discussing valve timing and cam acceleration figures. | ||
| View original record | X.207 SUCCESSORS TO GRY. Please let me have comparison with the R engine shaft we are making Coventry. Rudge-Whitworth Limited TELEGRAMS, RUDGE, COVENTRY. TELEPHONE 4001. EDWARD DE STEIN, CHAIRMAN.… | ||
| scan0021 | Page two of a letter to Rudge-Whitworth, Ltd. regarding a 500 c.c. racing engine. | ||
| View original record | Continued Letter to Rudge-Whitworth, Ltd. Sheet No. 2. On the matter of supplying you with a 500 c.c. racing engine, we will write you immediately after the holiday and send you an outline of the… | ||
| scan0022 | Calculations for engine rocker ratio, cam and valve acceleration. | ||
| View original record | 'R' rocker ratio 1.45 Cam acc Denis .005 / 1.45 = .00344 For Birley scale down .8848 becomes .00298 (cam acc 11,200) Valve acc .08367 At 4500 rpm = 1680 + 3.67 + 20.25 / 9 = 18/800 f.s.s (STD)… | ||
| scan0023 | Letter to Rudge Whitworth Ltd. detailing the maximum positive acceleration of a Bentley camshaft. | ||
| View original record | X 207 Exptl. Dept. Hs/Rm.11/KW. 24th May, 1934. G.L. Hack, Esq., Research Laboratory, Messrs. Rudge Whitworth Ltd., COVENTRY. Dear Mr. Hack, Further to our letter of the 19th inst. attached. The… | ||
| scan0024 | Letter to G.L. Hack of Rudge-Whitworth Ltd. regarding camshaft particulars and hydraulic tappet adjuster blueprints. | ||
| View original record | Hs/Rm.6/KW. Exptl. Dept. 19th May, 1934. G.L. Hack, Esq., Research Laboratory, Messrs. Rudge-Whitworth Limited, COVENTRY. Dear Mr. Hack, Thank you for your letter and the information re your Camshaft.… | ||
| scan0025 | Blueprint of a valve tappet block assembly with cross-sections and notes. | ||
| View original record | SECTION BB 1.500 3.166 1.166 VALVE LIFT (INT.) .302 VALVE LIFT (EXH) .245 ¢ OF CAMSHAFT AIR SEEPAGE OCCURS THROUGH THIS HOLE AND THROUGH CLEARANCE BETWEEN TAPPET AND GUIDE AT THIS POINT. ¢ OF CYLINDER… | ||
| scan0026 | Blueprint of a cylindrical mechanical component with internal features. | ||
| View original record | 3.384', 2 29/32', 1 7/8', 3/8, 7/16, .6875', .6870, ROLLS-ROYCE, LTD, PRINT ROOM, 19 MAY 1934, DERBY | ||
| scan0027 | Graph comparing valve overlap and timing positions for various engines. | ||
| View original record | H=1523 VALVE OVERLAP WITH CORRECT TIMING POSITIONS SPECTRE 2 BOTH INLET CAMS (E.85234) (CAMSHAFT EX.15042) TIMING .020 CLCE IO T.D.C EC T.D.C. BENTLEY (EB.1085) CAMSHAFT (CAM FORMS E.59272) TIMING… | ||
| scan0028 | Notification regarding the breakage of tappet springs on Bentley & 20/25 balance cams. | ||
| View original record | RHC: X207 Hs/Smth.14/KW.30.6.34. Balance Cams on Bentley & 20/25. We have been notified of the breakage of one of the tappet springs in connection with this mechanism on a customer's car. We should be… | ||
| scan0029 | Overhead camshaft with a silent drive, referencing the eccentric drive on a 4-litre Bentley. | ||
| View original record | x207 To Bn. Hs/Smth.19/KW. 9.10.34. Eccentric Camshaft Drive - Bentley. We are looking into the question of an overhead camshaft, and the possibility of providing it with a silent drive. We have… | ||
| scan0030 | Letter from Michigan Tool Company regarding the use of Cone type worm gears for a proposed overhead camshaft. | ||
| View original record | MICHIGAN TOOL COMPANY 7171 SIX MILE ROAD, E. TEL. WHITTIER 9030 DETROIT, MICH. November 2, 1934. SMTH Reference Hs/Smth.5/KW Rolls-Royce Limited, Derby, England. Att: Mr. F. D. Smith. Gentlemen: We… | ||
| scan0031 | Letter from Michigan Tool Company regarding gear design and thread spacing. | ||
| View original record | MICHIGAN TOOL COMPANY Rolls-Royce Ltd. -2- November 2, 1934. connection with securing accurate thread spacing. This condition is accentuated when the ratio is an even one and consequently, we have… | ||
| scan0032 | Letter to The Michigan Tool Company discussing requirements for an overhead camshaft drive using Cone worms. | ||
| View original record | 4207 Exptl. Dept. Hs/Smth.10/KW. 21st November, 1934. The Michigan Tool Company, 7171, Six Mile Road, E., Detroit, Michigan, U.S.A. Dear Sirs, We beg to thank you for your letter of the 2nd inst.,… | ||
| scan0033 | Concluding page of a letter discussing two leading British manufacturers. | ||
| View original record | -2- Hs/Smth.10/KW.21.11.34. These are probably the two leading British manufacturers for this class of product. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||
| scan0034 | Design and modification of silent tappets for the Bentley. | ||
| View original record | x207 To E. from Hs/Rm. Hs/Rm.8/KW.5.12.34. Silent Tappets for the Bentley. With a view to helping you with any work you may do on the silent tappets for the Bentley, we have gone over the job to try… | ||
| scan0035 | List of design features for Cadillac tappets intended for use in a Bentley. | ||
| View original record | L.207 Hs/Std.1/KW.1.12.34 Cadillac Tappets for Bentley. Features to be used in design :- (1) Cyl. head EB.615 modified for two rocker shafts and plunger casing seatings - see Hs.1629. (2) Lengthened… | ||
| scan0036 | New camshaft design and timing for a Bentley engine to be used with silent tappets. | ||
| View original record | x 207 Hs/Smth.8/KW.4.12.34. Bentley - Camshaft for use with Silent Tappets. The slow running of the Bentley engine will be very bad if silent tappets are used in connection with the present camshaft.… | ||
| scan0037 | Letter from Michigan Tool Company regarding a Cone Type Worm Gear. | ||
| View original record | MICHIGAN TOOL COMPANY 7171 SIX MILE ROAD, E. TEL. WHITTIER 9030 DETROIT, MICH. From London Office. Vincent House, Vincent Square, LONDON, S. W. 1. 20th December, 1934. Reference Hs/Smth.5/KW. Messrs.… | ||
| scan0038 | Graph comparing the Brake Mean Effective Pressure curves of various Cadillac and Rolls-Royce products. | ||
| View original record | G.M.C. CORRECTION TO 103° F. BRAKE MEAN EFFECTIVE PRESSURE CURVES CADILLAC & ROLLS - ROYCE PRODUCTS AXES: Left Y-Axis: B.M.E.P., LBS / SQ. IN., H.P., DEGREES. Right Y-Axis: LB/FT., LB / H.P. HR., FUEL… | ||
| scan0039 | New camshaft for Bentley cars, its suitability for supercharged models, and related drawing numbers. | ||
| View original record | To RHC. c. to Hs/Smth. x 207 Hs/Rm.12/KW.14.2.35. A new camshaft has just been issued for use on the Bentley with silent tappets. We think that this camshaft will also give us very good results on the… | ||
| scan0040 | Summary table of cam forms, detailing specifications for various engines. | ||
| View original record | SUMMARY OF R.R. CAM FORMS ENGINE | VALVE LIFT DIAGRAM | CAM FORM | VALVE | DURATION .020 CLCE | DURATION .005 CLCE | AREA UNDER VALVE LIFT CURVE - □ | LIFT MAX | LIFT 1st CHANGE OVER POINT |… | ||
| scan0041 | Request to produce a modified Bentley Camshaft (EB.2258) with two keyways. | ||
| View original record | To RHC. +207 Hs/Smth.3/KW.1.4.35. Bentley Camshaft EB.2258. Will you please make us another camshaft EB.2258, but with 2 keyways to Hs.1869 so that we can vary the timing by 1/2 tooth at a time.… | ||
| scan0042 | Request to try an R. engine type camshaft in a 3.500 Bore Bentley and have the tappets Fescolised. | ||
| View original record | To RHC. x 207 Hs/Smth.1/KW.3.10.35. 3.500 Bore Bentley. We wish to try the R. engine type camshaft Hs.965 in a big bore engine, and shall use the .750 radius bottom tappets Hs.351 in conjunction with… | ||
| scan0043 | Distributing blueprints for a Large Bore Bentley Camshaft and associated parts. | ||
| View original record | To-R.H.C? [text obscured] c. Hs/Gry. X207 EY/CS12/EH.26.11.35. Re Large Bore Bentley - Camshaft - Section 5090. Please receive herewith blue prints of the following new L.O.P. and details. E.B.2748… | ||
| scan0044 | Request for the manufacture of two different camshafts for a Bentley (High Power) engine. | ||
| View original record | To RHC. x207 Hs/Swdl.14/KW.5.5.36. Bentley (High Power). Will you please have 2 camshafts made for development of the high power unit as follows :- 1st Camshaft. E.32381 inlet cam forms scaled down to… | ||
| scan0045 | Instructions for an extra keyway to be cut on a shaft and a reference to camshaft arrangement details. | ||
| View original record | -2- Hs/Swdl.14/KW.5.5.36. In addition to the normal keyway, each shaft to have an extra keyway cut at 178° from the normal keyway position. The arrangement and other details of the camshafts are to… | ||
| scan0046 | List of points for consideration regarding the Bentley Overhead Camshaft Engine. | ||
| View original record | To Mr. E.W.H from RHC/RH. c.c. B/Snr. c.c. Hs/Rm. [Handwritten annotations start] Sidey 207. Swdl. Should like to know that all these points are receiving design consideration Pm [Handwritten… | ||
| scan0047 | Technical memo suggesting the use of castellated nuts and noting the lack of a breather and thermometer pocket. | ||
| View original record | -2- RHC/RH.1/AP.8.10.36. 9. Suggest that ¼" castellated nuts be used in place of plain nuts with bolt rivetted over, on the bolts which hold the chain damping pad. 10. (a) No form of breather is… | ||
| scan0048 | Features of a shorter duration valve lift curve camshaft for a Bentley cylinder head. | ||
| View original record | To EY. Copy to Rm. Da. HPS. Rm/Swdl. E/PSN.1/MN.18.12.36. 207 Bentley Shorter Duration Camshaft. Further to E's memo. E.1/HP.16.12.36, we send you herewith LeC.5426 of a shorter duration valve lift… | ||
| scan0049 | Page detailing modifications to camshaft and spring force specifications. | ||
| View original record | -2- (5) A modified ratio of acceleration at changeover to ace at full lift to suit the lower stress springs to LeC. 5417. The excess spring force over that theoretically required at 4500 r.p.m. is… | ||
| scan0050 | Urgent memo regarding the provision of Bentley Camshaft EB.3240 for the 'M' series. | ||
| View original record | URGENT. 207 BY/CS c. Rm/Grls. BY.15/N.12.1.38. Re: Bentley Camshaft - EB.3240 Kindly note the Experimental Dept. are anxious to have the above camshaft on the second half of 'M' series. RHC/RMN, has… | ||
| scan0051 | Agreement to introduce an improved performance Bentley camshaft (EB.3240) into production for 'M' series cars. | ||
| View original record | 207. By/Mtn. from Rm/Gry. Rm/Gry.1/AP.12.1.38 BENTLEY CAMSHAFT It was agreed at the Conference yesterday that the improved performance camshaft EB.3240 can be brought on Production at 101 in M,… | ||
| scan0052 | Confirming the successful testing of engines with EB.3239 Cam Form camshafts and authorising the despatch of chassis. | ||
| View original record | Handwritten: BENTLEY 207 HOT Notes (crossed out) Good (crossed out) Typed: RHC/ogs (crossed out) RHC/TWH (crossed out) Rm/Swdl. LA4/T6.9.38 With reference to your RHC/Cgs3/CP6.7.38, we have now tested… | ||
| scan0053 | Two designs for drilled up connecting rods for the Bentley and 20-HP models. | ||
| View original record | X214. R.H.C. Can we get one type on B5-UNIT? To RHC. from E/JNR. c. Hs. Drilled up Connecting Rods. X214 Y030 Ru We send you herewith: LeC.3559 showing two designs for the Bentley and 20-HP connecting… | ||
| scan0054 | Improved design for connecting rod oil pipes for Bentley and 20-HP models. | ||
| View original record | To RY. from E. c.c. Wor. Hs. Sft. X214. E/JNR.3/HP.10.7.33. Connecting Rod Oil Pipes - Bentley. We send you herewith drawing LeC.3556 showing the oil pipes attached to the connecting rods with four… | ||
| scan0055 | Calculation on the effect on critical speed of using Duralumin connecting rods in a Bentley engine. | ||
| View original record | X214. 23.9.33. EFFECT ON CRITICAL SPEED OF DURALUMIN CONNECTING RODS IN THE BENTLEY. The weight of 6 big ends is 7.7 lbs. and thus approximate inertia 47.5 lbs. in2. If these were made in Dural to the… | ||
| scan0056 | Request to weigh and measure Bentley RR.56 connecting rods and to see a sample before engine assembly. | ||
| View original record | To RHC. from E. c. for. Hs. By. X214 E.1/HP.5.10.33. Bentley RR.56 Conn: Rods. Before the above are assembled in an engine we should like to have the weights taken at the small and large ends compared… | ||
| scan0057 | The manufacture of Duralumin connecting rods for the RR.56 Bentley. | ||
| View original record | E. Hs. C. Roy. RHC x214 please note Returned RR CONNECTING RODS IN RR.56 - BENTLEY. When Mr. Devereux was at our Works about a week ago from some quarter or other he gained information that we are… | ||
| scan0058 | Letter from High Duty Alloys Ltd. concerning the production methods for RR.56 Connecting Rods for a Bentley Chassis. | ||
| View original record | COPY OF LETTER RECEIVED FROM :- HIGH DUTY ALLOYS LIMITED, 81 BUCKINGHAM AVENUE, SLOUGH, BUCKS. 7th. October 1933. Our Ref. WCD/MHG. Your Ref. BY.10/G. ---------------- Messrs. Rolls-Royce Limited,… | ||
| scan0059 | The weights and clearances for new Bentley RR.56 connecting rods. | ||
| View original record | To Hs. from RHC. X214 RHC.9/BE11.10.33. BENTLEY RR.56. CONNECTING RODS Attached are particulars of weights for the Bentley Connecting Rods which have been forged in RR.56 material(produced by Hughes… | ||
| scan0060 | Graph showing the thermal expansion of the small and large end bores of an RR56 connecting rod. | ||
| View original record | 10-10-33 TEMPERATURE - °C SMALL END CURVE LARGE END CURVE EXPANSION OF RR56 CONN. ROD BORES ROD EX/12396. EXPANSION - THOUSANDTHS OF AN INCH | ||
| scan0061 | Weight comparison of connecting rods for RR.56, Bentley, and 20/25 models. | ||
| View original record | WEIGHT OF RR.56. CONN. RODS AS COMPARED WITH BENTLEY 20/25 HP. WEIGHT OF BIG END WITH ROD SUSPENDED AT 'B' SMALL END AT 'A' SECTION OF STEM .750 .125R .650 DIA 0.950 1.150 BENTLEY - E556089 WEIGHT OF… | ||
| scan0062 | Specifications for Bentley RR. 56 connecting rods, including clearances, lubrication, weight, and dimensions. | ||
| View original record | To RHC. from E. c. Wor. Hs. Hy. Bentley RR. 56 Connecting Rods. Referring to your memo RHC.9/BE.11.10.33, the clearance proposed for the small end .0005" appears to me to be suitable but the initial… | ||
| scan0063 | Particulars for connecting rods in R.R.56 forged aluminium alloy, referencing information from High Duty Alloys and Leyland Motors. | ||
| View original record | Hs. c.RHC. c.E. X214 BY/EM7/J.23.10.33. Connecting Rods in R.R.56 Forged Aluminium Alloy. We attach hereto some particulars sent to us by Messrs. High Duty Alloys Limited, in regard to the clearances… | ||
| scan0064 | Letter from Leyland Motors to High Duty Alloys regarding clearances for R.R.56 connecting rods. | ||
| View original record | COPY FROM:- LEYLAND MOTORS LTD. Leyland, Lancs. To High Duty Alloys Ltd., Slough, Bucks. Sept.15th 1933. Ref. CGH/IS. METALLURGIST. Dear Sirs, R.R.56 Connecting Rods. The following particulars refer… | ||
| scan0065 | Confirming and comparing the weights of Bentley, 20/25, and RR.56 connecting rods. | ||
| View original record | X24 To E. from RHC. c. Wor. Hs. B.Y. RHC.6/BE24.10.33. Bentley RR.56. Connecting Rods. Replying to your E.1/HP.16.10.33. we confirm that the weights of 1.703 lbs and 1.725 lbs submitted in our… | ||
| scan0066 | Calculation on the effect of Dural connecting rods on the crankshaft critical speed for a Bentley engine. | ||
| View original record | X 214 To E. from Hs/Gry. C. Wor. By. Hs/Gry.1/RT. 25.10.33. DURAL CONNECTING RODS FOR BENTLEY. X62-P We have calculated the effect on the crankshaft critical speed of the Dural rods, and also of… | ||
| scan0067 | Requested modification to a Damper Connecting Rod. | ||
| View original record | X214 To BY. from HDY. c.c. Wor. E. Ms. De. Sft. Ps. HDY.1/MP.10.11.33. Damper Connecting Rod. With reference to the request by the Production Department that the cap of the connecting rod shown by N.… | ||
| scan0068 | Inquiring about the halted production of forged aluminum connecting rods and the continuation of associated pistons and gudgeon pins. | ||
| View original record | To Hs/Gry. from RHC/CEP. X214 RHC/CEP2/MS31.1.34. Forged Alum. Connecting Rods - LeC 3679-3682. There are 4 sets of the above instructed to the Shop, together with 4 sets of Pistons EB. 1311 and… | ||
| scan0069 | Requesting the machining of a set of Dural connecting rods with specific modifications. | ||
| View original record | To RHC. X214 Hs/GWH.11/KW.24.2.34. Re. Dural Connecting Rods to LeC.3682. Will you please machine a set of these rods to LeC.3682, with the exception that the gudgeon pins to be Bentley standard size… | ||
| scan0070 | The machining of Dural connecting rods and the deletion of shims. | ||
| View original record | X214 To By/SS. Hs/GWH.7/KW.26.2.34. Re. Dural Connecting Rods to LeC.3682. Will you please look to see whether the Dural Rods to LeC.3682 will stand machining when the .100" for shims is deleted. We… | ||
| scan0071 | Design for Bentley Duralumin connecting rods with the shim removed. | ||
| View original record | X214 To BY. from E/JNR. c. Hs. RHC. E/JNR.3/HP.27.2.34. Bentley - Dural Con: Rods. We send you herewith: LeC.3820 shewing our original design for the connecting rod but with the shim removed. It will… | ||
| scan0072 | Modifications required to test longer Bentley connecting rods made of Duralumin. | ||
| View original record | To RHC/HPS. X214 Hs/Mths.2/KW.28.2.34. BENTLEY CONNECTING RODS. We wish to try in a Bentley Test Bed Unit as soon as possible a set of Connecting Rods 1.000 longer than standard. To do this we suggest… | ||
| scan0073 | The requirements for fitting longer connecting rods to a Bentley Test Bed Unit. | ||
| View original record | To RHC/HPS. X 214 Hs/Mths.3/KW.8.3.34. BENTLEY CONNECTING RODS. We wish to try in a Bentley Test Bed Unit as soon as possible a set of Connecting Rods approximately 1.000" longer than standard. We… | ||
| scan0074 | Instructions regarding forged aluminium connecting rods for the 3 1/2 Litre Bentley. | ||
| View original record | X214 c. Hs/GWH. BY/CS3/EH.1.3.34. Re 3 1/2 Litre Bentley - Connecting Rod - Section 5030. Forged Aluminium Connecting Rod LeC.3682, to suit standard diameter Gudgeon Pin and without shims at Big End.… | ||
| scan0075 | Investigation into the effect of connecting rod length on Bentley engine performance, efficiency, and vibration. | ||
| View original record | x214 E. Hs. Lm. Rg/Tsn.5/DM.16.3.34. Length of Connecting Rods - Bentley. Attached are the results of the investigation you asked for into the effect of connecting rod length. The effect of the… | ||
| scan0076 | Graph of inertia torque for a single Bentley cylinder at 4250 RPM, comparing different connecting rod lengths. | ||
| View original record | INERTIA TORQUE FOR 1 CYLINDER AT 4250 R.P.M. BENTLEY. SHORT CONN ROD (7.87") SHOWN --- L/R = 3.5 LONG CONN ROD (9.00") SHOWN ___ L/R = 4.0 CONN ROD 10.12" LONG SHOWN _._ L/R = 4.5 STD. CONN. ROD… | ||
| scan0077 | Graph showing the effect of varying connecting rod length on various engine performance metrics. | ||
| View original record | [ "EFFECT OF VARYING CONN ROD LENGTH.", "STD. BENTLEY CYLINDER & CRANK.", "CONN. ROD LENGTH", "AERO L/R RATIO", "7.87" ROD", "7.95" ROD", "(STD BENTLEY)", "9.00" ROD", "10.00" ROD.", "PERCENTAGE… | ||
| scan0078 | Graph showing piston side thrust at 4250 RPM for a standard 6-cylinder Bentley engine, comparing different connecting rod lengths. | ||
| View original record | PISTON SIDE THRUST AT 4250 R.P.M. STD 6 CYL. BENTLEY PISTON SIDE - THRUST. LBS. CRANK ANGLE FROM T.D.C. SHORT CONN ROD (7.87") SHOWN LONG CONN ROD (9.00") SHOWN CONN ROD 10.12" LONG SHOWN STD. CONN.… | ||
| scan0079 | Connecting rod failure on Unit B.6 and instructions for its subsequent rebuild with specific modifications. | ||
| View original record | X214 To RHC. Hs/FJH.2/KW.13.4.34. CON. ROD FAILURE ON UNIT B.6. We have recently had a Con. Rod failure on the test bed on unit B.6. This failure has scrapped the crankcase top half and cylinder… | ||
| scan0080 | Standardisation document for drilled up connecting rods to clean up the design and remove the outside oil pipe. | ||
| View original record | RR 7858N (SH) (G7312. 29-12-33) BM. 3/640/2 COMPLETED 14.4.34. BENTLEY STANDARDISATION of PARTS. Date 29.3.34 23.2.34 X No. 214. Drawing No. LEC. 3559. Part List Description of Parts. DRILLED UP… | ||
| scan0081 | Summary of running tests on duralumin connecting rods and a decision to abandon further development. | ||
| View original record | FOR FILES X214 April, 1934. DURALUMIN CONNECTING RODS. Attached is a summary of the running we have done on light alloy connecting rods. There is no doubt that we have obtained sufficient information… | ||
| scan0082 | The failure of a Duralumin connecting rod during a 100-hour endurance test on a Bentley B.6 unit. | ||
| View original record | 11.4.34. FAILURE OF DURAL CON. ROD - BENTLEY. We have recently had a failure of a Dural Con. Rod on the test bed. The failure occurred 5½ hrs. after the start of an attempted 100 hours endurance test… | ||
| scan0083 | Analysis of connecting rod cap failures on a Bentley unit, considering torsional vibration as a potential cause. | ||
| View original record | -2- pressure was 19 lbs/sq.in. under the same conditions, and a very much larger proportion of the oil circulation went through the bearings. There has been one other failure on a Bentley unit (C.XI)… | ||
| scan0084 | Summary report on the total experimental running of Dural Con. Rods for Bentley. | ||
| View original record | TOTAL EXPERIMENTAL RUNNING TO DATE ON DURAL CON. RODS - BENTLEY. Two types of Dural Con. Rods have been used for experimental running. Both are shown on EX.12396. The second type (called B) is similar… | ||
| scan0085 | Test and usage log for various component sets, detailing performance, mileage, and failures. | ||
| View original record | -2- 12.4.34. Set 3. (A Type) - Fitted to Unit B.2. Test bed running at and above 4000 r.p.m. = ½ hr. Unit fitted to chassis GN.60. Mileage to date = 7894. Total running to date = ½ hr. + 7894 miles.… | ||
| scan0086 | Continuation page of a test report detailing the failure of two rods and the total running hours. | ||
| View original record | -3- 12.4.34. Set 7 cont'd. Original No. 1 rod failed. Cap of No. 2 rod cracked. Total running of 5 rods = 24 hrs. ================= Hs/F.J. Hardy. | ||
| scan0087 | Photograph of a fractured connecting rod big end cap. | ||
| View original record | ", | ||
| scan0088 | Photograph of a connecting rod that has failed, showing a fracture at the big end cap. | ||
| View original record | X | ||
| scan0089 | Photograph of a connecting rod cap. | ||
| View original record | ", | ||
| scan0090 | Blueprint illustrating cracks found in the Duralumin connecting rod cap for a Bentley. | ||
| View original record | HS 1353 No 2 CAP INLET SIDE CRACKS ROLLS-ROYCE, LTD. PRINT ROOM 13 APR 1934 DERBY. EXHAUST SIDE CRACKS IN CAP OF DURAL. CON. ROD. CON. ROD - BENTLEY. | ||
| scan0091 | Specification sheet detailing clearances for Bentley connecting rods made of Duralumin. | ||
| View original record | X214 C O P Y. 15.5.34. Clearances of Bentley Con: Rods (Dural). Big End Bore .00075". Big End Side Clearance (on shaft) .040 to .050". Small End Bore .0005". Small End Side Clearance (in piston) .008"… | ||
| scan0092 | Confirmation of connecting rod bolts stretching on Bentley engines and the need for them to be strengthened. | ||
| View original record | To E. X214 Hs/Rm.23/KW.31.7.34. This is to confirm that we are having a certain amount of trouble with connecting rod bolts stretching on Bentley engines. We think that the time has come when these… | ||
| scan0093 | Request to manufacture a lighter trial version of a Bentley Drilled Connecting Rod. | ||
| View original record | To RHC. X214 Hs/Smth.17/KW.2.10.34. Bentley Drilled Con. Rods. We find that the drilled rod is 3/4 oz. heavier than the standard rod, and are anxious to reduce the weight as far as possible. Will you… | ||
| scan0094 | Instructing a change to all future Bentley drilled rods to a new, lighter specification (Hs.1539). | ||
| View original record | x214 To RHC. Hs/Smth:17/KW.11.10.34. Bentley Drilled up Rod - Hs.1539. ------------------------------ We have saved about .025 lbs. by lightening the rod, and since the lighter section appears to be a… | ||
| scan0095 | Instructing a design change for narrow pin connecting rods. | ||
| View original record | To RHC. x214 Hs/Rm.11/KW.12.10.34. Narrow Pin Connecting Rods. Will you please ensure that all narrow pin connecting rods produced in future have the heavier bolts to EX.14210 and the lightened panel… | ||
| scan0096 | On the failure of connecting rod bolts in Bentley test bed units, mandating a strict replacement procedure. | ||
| View original record | To T. Salt. From Hs/Rm. c.c. to R. Matthews. c.c. to L. Smith. c.c. to RHC. BENTLEY TEST BED UNITS. We have now had three test bed units completely smashed up owing to failure of the connecting rod… | ||
| scan0097 | Failure of Bentley connecting rod bolts and recommending a stronger replacement. | ||
| View original record | To E. From Hs/Rm. γ 214 Hs/Rm.2/MJ.1.1.35. BENTLEY CONNECTING ROD BOLTS. Another engine has been smashed up due to the failure of these bolts. They have apparently a life of about 100 Hrs. at 4000… | ||
| scan0098 | Increased diameter of Bentley connecting rod bolts and the associated drawing LeC.4281. | ||
| View original record | X214 To EY. from E/JNR. c. Hs/Rm. RHC E/JNR.2/HP.3.1.35. re Bentley Connecting Rod Bolts. Referring to Hs/Rm.2/MJ.1.1.35, we have made a drawing which we send you herewith - LeC.4281 showing the… | ||
| scan0099 | Strength of Bentley connecting rods and a request to modify a set for testing. | ||
| View original record | To RHC. x214 Hs/Smth.3/KW.9.2.35. Bentley Conn. Rod. We have never broken a Bentley Conn. Rod, and we find that it is understressed compared with aero rods. Hs.1767 shows a lightened narrow pin rod,… | ||
| scan0100 | Requesting modification of Bentley Light Con. Rods EX.17754 to drawing Hs.1886. | ||
| View original record | To RHC. Try Hs/Smth.12/KW.5.4.3.35. Bentley Light Con. Rods EX.17754. The caps of these rods are not as light as we anticipated and we should like you to modify them to Hs.1886 before building them… | ||
| scan0101 | Bentley connecting rod failure and requesting a modified set with two locating tabs. | ||
| View original record | To RHC. X214 Hs/Smth.1/KW.27.5.35. Bentley Strip Bearing Con. Rods. We think it probable that the rod which failed in France had been reassembled the wrong way round, causing the locating tabs to… | ||
| scan0102 | Requesting modifications to narrow pin connecting rods for a Bentley. | ||
| View original record | To RHC. +W14 Hs/Smth.11/KW.28.5.35. Narrow Pin Con. Rods - Bentley. Will you please make us a set of con. rods to Ex.17754 but with the following modifications :- (1) Make dia. of big end bore 2.150.… | ||
| scan0103 | Big end bearing failure and proposed modifications to narrow pin crankshaft bearings. | ||
| View original record | To E. c. to Wor. c. to By. xut Hs/Rm.1/KW.1.6.35. Narrow Pin Crankshaft Bearings. You will have observed that a big end has failed on the test in France. The car there is of course fitted with a… | ||
| scan0104 | 12-cylinder engine design, specifically crankshaft practice and the need for a larger slipper wheel and damper. | ||
| View original record | -2- Hs/Rm.1/KW.1.6.35. We appreciate that if we ever decide to make a side by side rod 12-cylinder engine, we shall closely reproduce the present narrow pin crankshaft practice. This makes the… | ||
| scan0105 | Big end loading in Bentley engines, comparing standard and large bore units. | ||
| View original record | To E. c. to Wor. c. to By. HS/Smth.2/KW.1.6.35. Big End Loading - Bentley. Hs.1993/7/8 show polar diagrams of the big end loading in a standard engine with narrow pin rods and Aerolite pistons. It… | ||
| scan0106 | Comparison of engine performance characteristics between a standard and large bore engine configuration. | ||
| View original record | -2- Hs/Smth.2/KW.1.6.35. We suggest that if the 1.000" pins are found to be satisfactory on the standard engine, we should adopt 1.125" pins on the large bore engine. If this is done and if we use a… | ||
| scan0107 | Polar plot diagram of the inertia load on a Bentley engine crankpin at 5000 RPM. | ||
| View original record | 067 681 lbs/SQ. IN. PROJ. AREA 500 1000 1500 2000 2500 3000 <- 2100 TDC BDC 15 30 45 60 75 90 105 120 135 150 165 DIRECTION OF LINE OF PRESSURE DEGREES ON CRANK BIG END LOADING - BENTLEY. INERTIA… | ||
| scan0108 | Polar plot diagram illustrating the inertia loading on a Bentley connecting rod big end bearing at 5000 RPM. | ||
| View original record | [ "BIG END LOADING - BENTLEY", "INERTIA LOADING ONLY AT 5000 RPM", "NARROW PIN ROD EX 16046", "LOAD ON CON. ROD BRG.", "BDC", "TDC", "ROD", "CAP", "DEGREES ON CRANK", "lbs/sq in PROJ. AREA", "500",… | ||
| scan0109 | Polar plot diagram showing the big end loading for a Bentley engine. | ||
| View original record | BIG END LOADING — BENTLEY GAS PRESSURE LOADING ONLY AT 6.5/1 CR (MAX CYL. PRESS. = 700 lb/□") DEGREES ON CRANK lbs/□" PROJ. AREA LOAD ON CRANKPIN 7.4 Small 30.V.35 HS 1998 Plot markings: TDC BDC… | ||
| scan0110 | The cold temperature testing of Hall's Metal Bearings on a Bentley connecting rod assembly. | ||
| View original record | X214 To Hs/Rm. Hs/Smth.26/KW.21.10.35. Hall's Metal Bearings. We had a Bentley connecting rod and crankpin assembly with a Hall's metal bearing (white metal clearance) reduced in temperature to - 9°C.… | ||
| scan0111 | Cold temperature testing of Hall's Metal Bearings on a connecting rod assembly. | ||
| View original record | To RHC. X214 Hs/Smth.25/KW.21.10.35. Hall's Metal Bearings. We have tested the connecting rod assembly at the cold storage works, and find that there is no apparent tightening up of the bearing at… | ||
| scan0112 | Cold temperature test on a Bentley Dural connecting rod and crankpin assembly. | ||
| View original record | X214 To E. from Hs/Smth. c. to By. c. to Hl. Hs/Smth.4/KW.30.10.35. Bentley Dural Connecting Rod. We had a dural rod and crankpin assembly reduced in temperature to 12°F. ( - 11°C.) at the Cold… | ||
| scan0113 | Notification regarding new L.O.P. and details for a Large Bore Bentley Chassis connecting rod. | ||
| View original record | To: [REDACTED] c. Hs/Gry. Rm x 14 BY/CS16/EH.26.11.35. Re Large Bore Bentley Chassis - Connecting Rod - Section 5030. Please receive herewith the following new L.O.P. and details, to be instructed up… | ||
| scan0114 | Issue of new and altered blueprints for the Bentley 25/30 HP Chassis Connecting Rod. | ||
| View original record | x-ref To: EMD. c.c. Hs/Gry. BY/CS1/EH.10.1.36. Re Bentley & 25/30 HP. Chassis - Connecting Rod - Section 5030. Please receive herewith blue prints of the following new drawings, detailed in accordance… | ||
| scan0115 | Request for the weights of the Bentley connecting rod assembly. | ||
| View original record | X 214 To RHC. Hs/Smth.9/EW.13.1.36. May we please have the weights (big and little ends) of the Bentley conn. rod assembly, using solid Hall's metal big end bush, the oil groove being in the rod.… | ||
| scan0116 | New design for Bentley connecting rods to prevent breakages by avoiding sharp corners and increasing metal. | ||
| View original record | BY. RHC. Hs/Fm. X214 E/JNR.1/HP.28.4.36. Broken Bentley Connecting Rods. Referring to the above in Hs/Smth.19/KW. 3.1.36, we have now made a design of the rod avoiding sharp corners at the highly… | ||
| scan0117 | Urgent instruction to replace composite steel and aluminium shims with RR.56 forged shims for 25/30 and Bentley connecting rods. | ||
| View original record | BY/CS. [crossed out] c. DET. [crossed out] c. HOPS [crossed out] c. Hs/Rm. c. [illegible, crossed out] x14 Run Swdl- BY.1/G.29.9.36. 25/30 and BENTLEY CONNECTING RODS. I wish to confirm my verbal… | ||
| scan0118 | The fitting of new parts to a car, including con-rods, oil pump, servo cams, and an expansion box, and noting issues found. | ||
| View original record | 1H3.214 HOTEL DE FRANCE. CHATEAUROUX. Indre. France. Rm/GWH/IMW/5/JAB.3rd March 1937. To. Rm. c.c. Rm/GWH. [Text is struck through] 6. B. IV. The new con-rods were fitted to this car yester-day and… | ||
| scan0119 | Bentley big end loadings, referencing an attached polar diagram. | ||
| View original record | Conn Rods 214 To Rm 24.4.37 BENTLEY BIG END LOADINGS. We attach hereto Rm.364 showing the polar diagram for the Bentley big end loadings. The maximum inertia loading is 2060 lbs/sq.in. at 4500 r.p.m.… | ||
| scan0120 | Issues with the bedding of bearing metal in Bentley con rods and the need for filing. | ||
| View original record | RHC. from Rm/GWH. By. Rm. 244 Rm/GWH4/R.29.7.37. BENTLEY CON RODS. Kingsbury have received a further set of con rods where the bedding of the bearing metal in the housing was so bad that they had to… | ||
| scan0121 | Investigation into damaged Bentley connecting rods and bolt failures from depots. | ||
| View original record | Rm/GWH. from RHC/Cy. Siles RHC/Cy.1/LS.21.8.37. 24 SWD2 BENTLEY - CONNECTING RODS. During our investigation of your complaints on Repair Connecting Rods, we found on taking two sets at random from… | ||
| scan0122 | Request for a full analysis of the cost of Phantom III and Bentley connecting rods. | ||
| View original record | To G/Rb. from Rm/Swdl. X 214 also 314 and 1260 Rm/Swdl.6/MH.31.1.38. Will you please supply us as soon as possible with a full analysis of the cost of Ph.III and Bentley connecting rods. Rm/Swdl. | ||