Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Technical memorandum discussing the crankshaft, damper, and critical frequency calculations for the Bensport engine. | ||
| View original record | R. FROM E. X217. EL/M.16.1.32. C. to SG. WOR. C. to HS. BY. BENSPORT CRANKSHAFT. X.4553. From Report HS/GRY3/MA12132., it is seen, as was anticipated, that the mass of the dynamo armature, coupled to… | ||
| scan0002 | Suitability of a Peregrine crankshaft for a supercharged engine, comparing it to an Alfa Romeo design. | ||
| View original record | R. From HS/GRY. S. to Dr. HOF. C. to F. HY. 821F Hs/Gry.6/HA. 24. 3. 32. BENTSPORT CRANKSHAFT. Replying to your H.1/W.18.3.32. We do not consider the Peregrine crankshaft suitable for the supercharged… | ||
| scan0003 | Proposed modifications to the Bensport Engine's crankshaft to increase speed. | ||
| View original record | X218 R. from E. c. Sg. Bor. Hs. By. E.7/HP.15.4.32. Bensport Engine. We have been looking into the proportions of the Peregrine crankshaft, to see what can be done to raise the speed of the major… | ||
| scan0004 | Engine shaft calculations, Peregrine critical speed, and proposed improvements. | ||
| View original record | Sheet 2. E.7/HP.15.4.32. The web width is already as large as it should be judging from our model experiments of some time ago. The Peregrine major critical was calculated at 5750 r.p.m. by deduction… | ||
| scan0005 | Design considerations for the Bensport Crankshaft and supercharger. | ||
| View original record | X 219. Hs/GRY. from E. E.1/HP.19.4.32. Re Bensport Crankshaft With reference to the rough draft of your report on the above; we are glad to see the major critical has gone up from 5750 to 6400. With… | ||
| scan0006 | Potential requirement and cost of using nitro-hardened crankshafts on the Bensport model. | ||
| View original record | Copy. X217. x4469. ROY from E. c. Sg. Wor. Hs. By. ----------------- E.2/HP.23.4.32. ----------------- Nitro-hardened Crankshafts. --------------------------- We feel very definitely that we may… | ||
| scan0007 | Comparative analysis of the stiffness of Peregrine and Bensport crankshafts. | ||
| View original record | X217 27. 4. 32. XGOP BENSPORT CRANKSHAFT. Effect on the stiffness of the Peregrine crankshaft of lengthening the webs by decreasing the length of the journals and of using a journal size of 2 1/4"… | ||
| scan0008 | The stiffness and natural frequency of a supercharger drive. | ||
| View original record | -2- SUPERCHARGER. The stiffness of the drive to this, a .650 dia solid shaft 8.700 long is 23600 lbs ins/radium. The natural frequency of the supercharger on its drive is 105/sec. This would lower the… | ||
| scan0009 | Fitting of a Bensport crankshaft with larger diameter journals similar to the Peregrine engine. | ||
| View original record | RHC. From Hs/Gry. X217 Hs/Gry.3/MA.26.5.32. BENSPORT CRANKSHAFT. We wish to fit a crankshaft having the larger dia (2.250") and narrower journals in the Peregrine engine. We send you herewith a sketch… | ||
| scan0010 | Blueprint showing the dimensions of a centre main bearing for a Bensport crankshaft in a Peregrine crankcase. | ||
| View original record | H's 620 2.700 CTS UNALTERED .312 DIA STUD 2.650 DIA .060 +0 -1 .175 Rd. 2.250 DIA +1 2.300 DIA 2.502 DIA -1/2 OTHER DIMENSIONS TO BE SCALED OFF LGC 3097 2.500 DIA +1 .800 CRANKCASE CENTRE MAIN BEARING… | ||
| scan0011 | The Bensport crankshaft, its balance weight studs, and testing on a Peregrine engine. | ||
| View original record | X 217. SERVICE To R. from E. c.c. Sg. Wor. Hs. By. E.6/HP.27.5.32. Re Bensport. Please find attached print of LeC. 3097 showing the Bensport crankshaft to the dimensions proposed in E.7/HP.15.4.32.… | ||
| scan0012 | Failure of a Peregrine crankshaft during testing and proposals for new dimensions. | ||
| View original record | X217 To R. from Hs/Gry. c. Sg. Wor. c. E. EV. Hs/Gry. 9/KT. 21.6.32 BENSPORT CRANKSHAFT. Our tests with the Peregrine crankshaft with no inertia on the nose except the fan pulley show the half speed… | ||
| scan0013 | Comparison table of calculated stiffness, inertia, and critical speed for various engine components. | ||
| View original record | Top Header Row: PEREGRINE | BENSPORT. | ALFA ROMEO. Second Header Row / Details: L.100043 | Lac.3097 | 2.5 journal 1.75 min. | 2.375 journal 2.0 min Row 'Calculated stiffness': 34500 | 43000 | 48000 |… | ||
| scan0014 | 'Bensport' engine's crankshaft limitations for racing applications. | ||
| View original record | V217. To R. From Hs. c. to Sg. Wor. c. to E. By. Hs.2/MJ.22.6.32. 'BENSPORT' ENGINE. We consider in deciding on the 'Bensport' engine we should look forward to the fact that engine speeds are likely… | ||
| scan0015 | Reduction of crankshaft stroke for the Reisport engine to raise its critical speed. | ||
| View original record | A. From HS/Gry. c. to Mr. H.R. c. to A. HV. c. to Hdy. D. 217 HS/Gry.2/ML.29.8.23. REISPORT CRANKSHAFT. In order further to raise the critical speed of the crankshaft for this engine it has suggested… | ||
| scan0016 | Data table comparing engine crankshaft stiffness, inertia, and critical speeds for various configurations. | ||
| View original record | COLUMN HEADERS: Row 1: PEREGRINE, BENSPORT, 3 1/2" STROKE, 3 1/2" STROKE, 3 3/4" STROKE, 3 3/4" STROKE, 3 7/8" STROKE Row 2: E.100043, LEC. 3097, 2 3/8 JOURNALS, 2 1/4 JOURNALS, 2 3/8 JOURNALS, 2 1/4… | ||
| scan0017 | Amended list of critical speeds for the Bensport crankshaft. | ||
| View original record | X21T. R. From Hs/Gry. c. to E. Hs/Gry.19/MA. 6.7.32. BENSPORT CRANKSHAFT. We send you herewith an amended list of the critical speed of various crankshafts for this engine including that with a 4"… | ||
| scan0018 | Table comparing engine characteristics such as Stiffness, Inertia, and Critical Speed across different configurations. | ||
| View original record | Table Data: Column Headers: - PEREGRINE - BENSPORT - 3 1/2" STROKE, 2 3/8" JOURNALS, 2" PINS - 3 1/2" STROKE, 2 1/4" JOURNALS, 1 3/4" PINS - 3 3/4" STROKE, 2 3/8" JOURNALS, 2" PINS - 3 3/4" STROKE, 2… | ||
| scan0019 | Blueprint for the Bensport Crankshaft. | ||
| View original record | X217 RECEIVED To BY. from E. [STAMP: 15 SEP 1932 RECEIVED] c.c. Sg. For. Hs. E.1/HP.15.8.32. re Bensport Crankshaft. We send you herewith a blueprint of LeC.3165 showing the type of front end we are… | ||
| scan0020 | Design issues with the J.I. crankshaft and proposing improvements for the Bensport model. | ||
| View original record | X21J. To E. from Hs/Rm. Hs/Rm.4/AD29.11.32. J.I. CRANKSHAFT X5010. As we have increased the diameter of the journals on the crankshafts the noses remain of the same size. The result is a very sudden… | ||
| scan0021 | The design of the Bensport J.1. crankshaft, referencing drawing LeC.3284. | ||
| View original record | X215. To BY. from E/JNR. c. Wor. Hs. re Bensport J.1. Crankshaft. Please receive herewith: LeC.3284 - showing the complete design of the crankshaft, bearings and bearing caps, the crankpins being 2"… | ||
| scan0022 | Necessity of using studs instead of bolts for main bearings on the Bensport engine, affecting the 20/25 model. | ||
| View original record | To BY. from E. c. to Hs. r 217 E.4/HP.21.12.32 X5010. re Bensport engine and larger crankshaft for 20/25. We find it necessary to use studs instead of bolts for securing the main bearings on Bensport… | ||
| scan0023 | Drawing LeC.3324 for the Bensport J.1, detailing changes to the crankcase, starter motor, and main bearing caps. | ||
| View original record | X 217. To BY. from E./JNR. E/JNR.4/HP.23.12.32. c. Wer. Hs. re Bensport J.1. Please receive herewith: LeC.3324. This drawing deals with: (1) The rear crankcase facings. (2) Mounting of the starter… | ||
| scan0024 | Suggestion to test a modification for increasing oil holes in chassis crankshaft journals. | ||
| View original record | Hs. c. RHC X 217. BY.1/G.9.2.33. X 4027 X 7010 X 1010 LUBRICATION OF CHASSIS CRANKSHAFTS. I would suggest that before we put a modification through to increase the number of holes in the journals from… | ||
| scan0025 | Bearing modifications for the 2nd Bensport's Experimental Car. | ||
| View original record | X217. To H.S.) from B.Y.) c RHC. E.2/HP.18.2.33. re 2nd Bensport's Experimental Car. We think the next experimental Bensport's car should have the bearings grooved in accordance with the designs made… | ||
| scan0026 | Weight reduction campaign for a Bentley crankshaft by machining holes. | ||
| View original record | To RHC. from Hs/Rm. X217. Hs/Rm.9/KT.26.4.33. BENTLEY CRANKSHAFT. We are having a lightening campaign on the Bentley. There is a considerable amount of unnecessary weight in the crankshaft. Will you… | ||
| scan0027 | Blueprint showing a cross-section of a component with a diameter dimension. | ||
| View original record | 1.500 DIA ROLLS ROYCE. LTD. PRINT ROOM APR 26 1933 DERBY. | ||
| scan0028 | Balance issues and proposed modifications for a Bensport crankshaft. | ||
| View original record | To E. from Hs/Gry. X217 Hs/Gry.8/KT.29.4.33. BENSPORT CRANKSHAFT. As we understand that you are instructing a light-ened crankshaft for this unit, we are sending you the information below showing that… | ||
| scan0029 | Calculations on the critical speeds of the lightened Bensport crankshaft. | ||
| View original record | X21J. To E. from Hs/Gry. Hs/Gry.3/KT.9.5.33. We send you herewith as requested calculations on the critical speeds of the lightened Bensport crankshaft. Hs/Gry. | ||
| scan0030 | Comparison table for various Bensport J.1. crankshaft configurations and their properties. | ||
| View original record | BENSPORT J.1. CRANKSHAFTS. | | EB.39. | 1.5 Holes in Journals. 1.350" Pins. | 1.6 Holes in Journals. 1.350" Pins. | 1.750 Holes in Journals. 1.500" Pins. | |---|---|---|---|---| | Stiffness | 52500 |… | ||
| scan0031 | Requesting an experimental lightened 'Bensport Crankshaft' be made, detailing the modifications. | ||
| View original record | To RHC. from E/JNR. c. Hs. E/JNR.10/HP.11.5.33. Bensport Crankshaft. We send you herewith blueprint Lec.3486, showing a lightened crankshaft by boring out the pins and the journals. Will you please… | ||
| scan0032 | Experimental lightening of a Bensport crankshaft and related design considerations. | ||
| View original record | X217 To Hs. from E. c. Sg. Wor. By. RHC. Bensport Crankshaft. We have issued a lightened crankshaft for experiment to Hs/Gry's suggestion, with the bores of the pins and journals increased, and the… | ||
| scan0033 | The oil grooving specifications for Bentley Main Bearings. | ||
| View original record | X217. To BT. from E/JNR. E/JNR.8/HP.24.5.33. c. Hs. re Bentley Main Bearings. We send you herewith: LeC.3503, showing the oil grooving to the bearings, similar to the 20-HP. - that is - front, central… | ||
| scan0034 | Piston and crankshaft failures during a high-speed endurance test on a Bentley Unit C.13 engine. | ||
| View original record | FILES. X217. 26.8.33. HIGH SPEED ENDURANCE. BENTLEY UNIT C.13. X236 XCRRH PISTON FAILURE. Pistons LOP. EB.513. EB.495 Die Cast (Mx. type of bedding) EB.501 Gudgeon Pin. Cyl. Block. EB.89 (Short type… | ||
| scan0035 | Failure report concerning a No.6 balance weight breaking through the crankcase due to a broken retaining stud. | ||
| View original record | -2- No.6 Balance weight (large) on No.4 journal came through nearside of crankcase, scrapping top and bottom half. The retaining stud had broken off at the base. Total running time since overhaul and… | ||
| scan0036 | Blueprint drawing illustrating a Bentley piston failure with dimensional data. | ||
| View original record | Hs. 1116 BENTLEY PISTON FAILURE A. DIA B. DIA C. DIA D DIA. CRACK. PISTON GRINDING. DIA A. DIA B. DIA C. DIA D. Mx. TYPE 3.227 3.231 3.240 EB.500 3.230 3.238 3.247 3.248. ROLLS ROYCE, LTD. PRINT ROOM… | ||
| scan0037 | Correct friction setting for a Bentley crankshaft spring drive. | ||
| View original record | X 217 To By. from Hs/Gry. Hs/Gry.2/KT.25.5.33. BENTLEY CRANKSHAFT SPRING DRIVE. With regard to BY/SS's query, asking what friction setting this should have, we think 16 lbs + 1 is correct for this… | ||
| scan0038 | Technical note on increasing the critical speed of a Bensport crankshaft by modifying journal size and bearing shells. | ||
| View original record | X21T. FILES. 19.6.33. BENSPORT CRANKSHAFT. By increasing the journal size from 2.250 to 2.750 we should raise the critical speed 7% and should therefore be able to run up to 4800 instead of 4500.… | ||
| scan0039 | Dimensioned drawing for a crankshaft journal and bearing cap stud arrangement. | ||
| View original record | 3.050 CTS .375 DIA STJ ARRANGEMENT 2.250 DIA .117 3.285 CTS .080 2.750 DIA 2.750 DIA JOURNAL CRANKSHAFT J1 BEARING CAP STUD CENTRES TO BE SPREAD .235 ALLOWING .030 WHITEMETAL .030 STEEL SHELL… | ||
| scan0040 | Broken slipper drive centre from a 3 1/2 Litre Bentley, urgently requesting advice as the issue is delaying a chassis. | ||
| View original record | Hs ✓ c.E.H c By c Won. from Mx. X24T. Mx2/T31.7.33. 3 1/2 Litre Bentley - Slipper Drive. We have found a slipper drive centre broken on an engine in a chassis. The fracture you will see is at the base… | ||
| scan0041 | Examination of a 3 1/2 Litre Bentley slipper drive, concluding the engine was over-revved. | ||
| View original record | To Mr. from Hs/Rm. C. E. By. C. Wor. X249- Hs/Rm.16/KT.3.8.33. 3 1/2 LITRE BENTLEY - SLIPPER DRIVE. We have carefully examined this slipper drive and we are positive that the engine to which this was… | ||
| scan0042 | Modifications for improved spigotting for the mounting of a Bentley slipper flywheel. | ||
| View original record | To BY. from E. c. RHC. X24T.. E.2/HP.25.8.33. Modified Spring Drive and Slipper Flywheel - Bentley. We send you herewith LeC.3602 showing modifications to LeC.3597 to provide improved spigotting for… | ||
| scan0043 | Two separate incidents of balance weight failures on a Bentley unit and another engine in France. | ||
| View original record | X217 E. From Hs/Rm. c. to Wor. c. to By. Hs/Rm.5/MA.26.8.33. Whilst running an endurance test on a Bentley unit, No.6 balance weight came off. The balance weight fixing was not to the latest drawing… | ||
| scan0044 | Halting work on Bentley chassis crankshafts due to a balance weight failure. | ||
| View original record | Sft. c. E. Dept. c. Hs. G. E. G. Roye X217. BY.1/N.28.8.33. Re: Bentley Chassis Crankshafts. Will you kindly note that as the result of a failure in France where the balance weight has come adrift, we… | ||
| scan0045 | Cause of failures in Bentley crankshaft balance weights and proposing design improvements. | ||
| View original record | X217. To WOR. from E. c.c. Hs. By. Mr. EP. Bentley - Crankshaft Balance Weights. Referring to the failures in connection with the above, it seems clear that the failure experienced at the Works has… | ||
| scan0046 | Crankshaft problems in the 3½ litre Bentley and the urgent requirement for a four-bearing crank. | ||
| View original record | X217 To E. From Hs. c.c. to Wor. c.c. to H. c.c. to By. Hs.8/MJ.31.8.33. Re. 3½ litre Bentley. We consider that one of the first urgent problems on this car is to put the crankshaft period beyond the… | ||
| scan0047 | Suggesting that balance weights be forged solid with the crankshaft. | ||
| View original record | COPY. X217 To E. from Hs. c. to Wor. c. to By. c. to Sft. Hs.11/MJ.31.8.33. X7010 X Solo BALANCE WEIGHTS. We suggest that in future production we might find it economical and certainly cause less… | ||
| scan0048 | Making balance weights solid with the crankshaft and issues with failures on a Bentley engine. | ||
| View original record | X217. To Hs. from E. c. Wor. By. Sft. E.4/HP.1.9.33. X5010 X7010 X217 Balance Weights. Referring to your memo Hs.11/MJ.31.8.33, I am generally in agreement with your suggestion to make balance weights… | ||
| scan0049 | Modifications to Bentley balance weights for the first 15 engines. | ||
| View original record | To BY. from E/JNR. X217. E/JNR.4/HP.1.9.33. c. Wor. Hs. Sft. RHC Bentley Balance Weights. We send you herewith: LeC.3609 shewing the modifications necessary to the first 15 engines having the single… | ||
| scan0050 | Bentley development regarding a lightened crankshaft, detailing vibration issues and flywheel loosening at high RPM. | ||
| View original record | X217. To E. from Hs/CTS. c. to By. Hs/CTS.10/KT. 8.9.33. BENTLEY DEVELOPMENT. LIGHTENED CRANKSHAFT LEC.3486. UNIT.B.5: Crankshaft Ex.11269. Balance weights Ex.11268. " " Ex.11278. Flywheel & Clutch… | ||
| scan0051 | Drawing for a Bentley Solid Crankshaft. | ||
| View original record | X217. To EY. from E/JNR. E/JNR.5/HP.11.9.33. c. for. Hs. re Bentley Solid Crankshaft. We send you herewith drawing: LeC.3632 shewing the balance weights solid on the crank slabs. This is not the final… | ||
| scan0052 | Analysis of methods to raise the critical speed of a Bensport crankshaft. | ||
| View original record | FILES ----- X217. 12.9.33. ------- BENSPORT CRANKSHAFT. -------------------- We have looked into the possibility of raising the critical speed of this crankshaft. The present shaft EB.39 has a half… | ||
| scan0053 | Cost benefits and forging possibilities of a Bentley solid crankshaft. | ||
| View original record | X217. To BY. from E. E.6/HP.20.9.33. c. for. Hs. Sft. Bentley Solid Crankshaft. We attach herewith memo Sft.4/BH.19.9.33, from which you will see that Sft. is all in favour of forming the balance… | ||
| scan0054 | Effect on critical speed of using Duralumin connecting rods in a Bentley. | ||
| View original record | 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 same drawings… | ||
| scan0055 | Requesting the supply of springs for experiments on the new Bentley spring drive. | ||
| View original record | To RHC. from Hs/FJH. X2+T Hs/FJH.4/KT.27.10.33. SPRINGS FOR BENTLEY SPRING DRIVE. Will you please supply 4 springs to V.1648 and 4 springs to V.1649. These springs are required as soon as possible for… | ||
| scan0056 | Request to manufacture driving springs for a Bentley spring drive to be fitted to a test car. | ||
| View original record | 1249 RHC. From Hs/Hardy. Hs/Hardy.5/MA.11.11.33. DRIVING SPRINGS FOR BENTLEY SPRING DRIVE TO LeC.3602. Will you please make 8 springs to V1656 and 8 springs to V1657. These are required for the new… | ||
| scan0057 | Requesting the creation of a set of balance weights for a fully balanced Bentley crankshaft test. | ||
| View original record | 1217 To RHC; from Hs/Gry. Hs/Gry:S/KT.11.11.33. FULLY BALANCED CRANKSHAFT - BENTLEY. We want to run a crankshaft fully balanced for tests on high speed roughness. This is easiest done by making new… | ||
| scan0058 | Request to manufacture a distance piece and several discs for experiments on the new Bentley spring drive. | ||
| View original record | x247 To RHC. from Hs/FJH. Hs/FJH.17/KT.11.12.33. NEW BENTLEY SPRING DRIVE TO LEC.3602. Will you please make one Distance Piece to Hs.1234, one disc to Hs.1235, and six discs to Hs.1236. These are… | ||
| scan0059 | The design, calibration, and performance testing of a new Bentley crankshaft damper and spring drive. | ||
| View original record | X217 To E. from Hs/FJH. c. to By. Hs/FJH.3/KT.13.12.33. Y634 NEW BENTLEY CRANKSHAFT DAMPER & SPRING DRIVE TO LEC.3602. In this damper the spring drive of the crankshaft pinion is independent of the… | ||
| scan0060 | Testing modifications to a damper and spring drive to address oscillation and rattle issues. | ||
| View original record | -2- Hs/FJH.3/KT.13.12.33. The serious objection to the damper in this condition was that at 550 R.P.M. the spring drive had a critical period at which it oscillated violently against its stops. With… | ||
| scan0061 | Test report on a spring drive's damping, critical oscillation, and gear rattle characteristics. | ||
| View original record | -3- Hs/FJH.3/KT.13.12.33. With the rating of 42.5 lbs.ins. per degree there was no evidence of the spring drive hitting its stops. The damping necessary to control the critical oscillation was 1 1/2… | ||
| scan0062 | The development and testing of light alloy connecting rods for the 3 1/2 Litre Bentley. | ||
| View original record | 217 To E. From Hs. c. to Sg. c. to Mor. c. to By. Hs.4/MJ.24.1.34. LIGHT ALLOY RODS. - 3 1/2 LITRE BENTLEY. It will be remembered that we started these rods going some time ago. The chief object of… | ||
| scan0063 | Standardisation of a felt ring for the rear of a crankshaft bearing. | ||
| View original record | RR 755B (5H) (52674, 16-10-33) BM. 3/262/6. X 217. Completed 6.2.34 BENTLEY STANDARDISATION of PARTS. Date 20.12.33 Description of Parts: Felt Ring at rear of Crankshaft Bearing. Origin: To prevent… | ||
| scan0064 | Order of R.B.1659 Damping Springs for the Bentley Chassis Spring Drive. | ||
| View original record | c.c. Ha/Gry c.c. W/MC X2457 BY/C31/EH.16.2.34. Re Bentley Chassis - Spring Drive - Section SC20. Please receive herewith the following tracing for issue to the departments concerned. R.B.1659 Damping… | ||
| scan0065 | Making model ribs for a crankcase for a 4-bearing crankshaft. | ||
| View original record | RHC. X217 Hs/Gry.14/KW.16.5.34. Crankcase for 4-Bearing Crankshaft. We think it would be a good idea to make some model ribs of the crankcase for this crankshaft. If therefore you would remove the… | ||
| scan0066 | Experiment on the number of bearings for Bentley Crankshafts. | ||
| View original record | Handwritten: X217 Handwritten: Hs To E. FROM Sg. re Bentley Crankshafts. Copy to Wor.Hs.HX. I am in receipt of E.3/HP.16.6.34 and have noted with interest what you say relative to the number of… | ||
| scan0067 | Design features and modifications for an experimental Bentley 4 Bearing Crankshaft. | ||
| View original record | 4217 To HHG. from E/JNR. E/JNR.2/HP.29.6.34. c. Hs. By. Bentley 4 Bearing Crankshaft. We send you herewith blueprints:- LeC.4014. LeC.4015. In drawing this experimental crankshaft we have come across… | ||
| scan0068 | Experiments to increase the critical speed of a Bentley crankshaft. | ||
| View original record | +217 To SG. C. to Wor. C. to E. C. to Hy. C. to RMO. C. to Bn. Hs/Rm.16/KW. 24.7.34. Critical Speed - Bentley Crankshaft. Since trouble was experienced on test and in experimental running with… | ||
| scan0069 | Crankshaft and bearing modifications for improved engine performance and safety. | ||
| View original record | -2- HS/Rn/16/KW.24.7.34. We are rather enthusiastic about this development because the crankshaft can be obtained from existing forgings, also the connecting rods. These are the only parts of the… | ||
| scan0070 | Modifications to a Bentley crankshaft to increase its critical speed and safety margin. | ||
| View original record | Y 217 To Sg. From Hs/Rm. c. to Wor. c. to S. c. to Hy. c. to MUS. c. to Dn. CRITICAL SPEED - BENTLEY CRANKSHAFT. Since trouble was experienced on test and in experimental running with flywheels being… | ||
| scan0071 | Test report on B.10 unit with a special crankshaft, focusing on noisy Textolite gears and an endurance test failure. | ||
| View original record | X217 8.8.34. B.10 UNIT (1.000" CRANKPINS). This unit had a special crankshaft (EX.14081) having 1.000" wide crankpins, but with standard journals. The Connecting Rods (EX.14210) had 1.000" wide Big… | ||
| scan0072 | Endurance test detailing oil system modifications and an ignition system replacement. | ||
| View original record | -2- The bearings were not damaged by the failure of the oil supply so that by replacing the Gallery Pipe the test was continued. The new gallery pipe was fitted having silver soldered joints instead… | ||
| scan0073 | Fitting a light disc flywheel and Borg & Beck clutch to a B.10 unit for high-speed roughness tests. | ||
| View original record | To RHC. +217 Hs/Gry.26/KW. 29:8:34: B.10 UNIT. (Fitted with narrow Crankpins). We wish to fit to this unit a light disc flywheel and Borg & Beck clutch to EX.12846, for further tests on high speed… | ||
| scan0074 | Crankshaft oiling schemes, comparing issues with Bentley engines to Phantom and Wraith models. | ||
| View original record | To Hs. from E. c. Sg. Wor. By. Crankshaft Oiling Schemes. I understand that greater trouble is had with big end bearings on the Bentley on those big ends (Nos. 2 and 5) which have an ungrooved… | ||
| scan0075 | Modifications to the Bentley narrow bearing crankshaft to prevent flywheel flutter. | ||
| View original record | To RHC. X217 Hs/Smth.7/KW.9.10.34. Bentley Narrow Bearing Crankshaft. With the narrow bearing crankshaft EX.14081 we are able to use a longer rear main bearing. At the same time we should like to… | ||
| scan0076 | Crankshaft wear on the Bentley and 20/25 models. | ||
| View original record | X217 To Hl. c. to E. c. to RHC. Hs/Rn.12/KW.10.10.34. Bentley and 20/25 Crankshaft wear. We are somewhat concerned with the wear of the crankshafts of the 20/25 and the Bentley. We have a good example… | ||
| scan0077 | Crankshaft oiling schemes, comparing the continuous oil feed of the Bentley system against the Phantom scheme. | ||
| View original record | X 217 To E. c. to Sg. c. to Wor. c. to By. Hs/Rm/12/KW.11.10.34. Crankshaft Oiling Schemes. As discussed with you, we prefer the continuous oil feed for engines which run at high speeds. On the whole… | ||
| scan0078 | Request to prepare a second set of parts for N.Sch.4190 and to leave the flywheel undrilled. | ||
| View original record | x217 To RHC. Hs/Rn.14/KW.12.10.34. Will you please prepare a second set of parts to N.Sch.4190, LOP. GB.1377. Will you please leave the back of the flywheel undrilled so that we can fit it to either… | ||
| scan0079 | Requesting the production of forgings for a narrow pin crankshaft after successful testing. | ||
| View original record | To RHC. X 217 Hs/Rn,11/KW.23.10.34. Narrow Pin Crankshafts. We have now done sufficient running on a narrow pin crankshaft to wish to reproduce it. We may want to alter the dimensions slightly, but… | ||
| scan0080 | Surprisingly weak results of a torsion test on a 4-bearing crankshaft. | ||
| View original record | To RHC. x217? Hs/Gry.11/KW.30.10.34. 4-Bearing Crankshaft. The result of the torsion test of this crankshaft shows it to be surprisingly weak. We cannot think of any reason for this other than the… | ||
| scan0081 | Upcoming 10,000-mile test on a B.10 unit, focusing on narrow pin crankshafts and bearing wear. | ||
| View original record | +217 To RHC. c. to HL. Hs/Rm.18/KW.1.11.34. Narrow Pin Crankshafts. You will shortly be receiving B.10 unit out of B-23-AE to be prepared for 10,000 miles test. Obviously one of the most important… | ||
| scan0082 | Requesting the completion of models for the analysis of a 4-bearing crankshaft. | ||
| View original record | To RHC. +217 Hs/Rm.7/KW.14.12.34. In order that we can clear up our analysis of the 4-bearing crankshaft, we shall be glad if you will complete the models to Hs.1580/1. Hs/Rm. | ||
| scan0083 | Crankshaft modifications and experiments for supercharging 6-cylinder Bentley engines. | ||
| View original record | To Sg. & Wor. c. to E. c. to By. c. to Bn. X217 HS/Rm.3/KW. 21.1.35. Crankshafts for 6-Cylinder Engines. In view of the remark in the last car meeting minutes that we may be pushed into the position… | ||
| scan0084 | Test bed and torsion test results comparing a four-bearing and a seven-bearing Bentley crankshaft. | ||
| View original record | To Sg. & Wor. c. to E. c. to By. c. to By. Four Bearing Crankshaft - Bentley. Test bed running of the engine fitted with a narrow pin 4 bearing crankshaft to EX.14348 showed the half period to be at… | ||
| scan0085 | Analysis of crankshaft stiffness, comparing a 4-bearing shaft with a 7-bearing shaft and the potential benefits of design alterations. | ||
| View original record | -2- Hs/Gry.1/KW.19.1.35. We next further investigated why the 4 bearing shaft is only 17% stiffer than the 7 bearing shaft. It will be remembered that the 4 bearing shaft had to suit existing cylinder… | ||
| scan0086 | Summary of observed and calculated critical speeds for various Bentley engine crankshafts. | ||
| View original record | -3- Hs/Gry.1/KW.19.1.35. Summarising the critical speeds of various shafts for the Bentley Engine we get - Crankshaft Critical Speed r.p.m. Observed Calculated (1) Standard 7 bearing 5000 (2) Narrow… | ||
| scan0087 | Model crank torsion test results showing angular deflections for short and long crank pins. | ||
| View original record | HS 1580/1 MODEL CRANK TORSION TESTS - DEFLECTIONS. - HS 1581 SHORT CRANK PIN | LOAD APPLIED LBS | TORQUE LB-FT | - ANGULAR DEFLECTIONS - | |---|---|---|---|---|---| | | | 1. | A. | B. | C. | D. | | 0… | ||
| scan0088 | Graph comparing the torsion test results of a 4-bearing crankshaft with a standard 7-bearing crankshaft. | ||
| View original record | BENTLEY CRANKSHAFT - Ex 14348 4 BEARING SHAFT TORSION TEST COMPARISON WITH STANDARD 7 BEARING SHAFT (EB/1083 - WITH BALANCE WEIGHTS) ANGULAR DEFLECTION - DEGREES 1.2 1.0 0.8 0.6 0.4 0.2 TORQUE - LB… | ||
| scan0089 | Graph showing the angular deflections from model crank torsion tests. | ||
| View original record | HS 1580 / 1 MODEL CRANK TORSION TESTS 2-1-35 ANGULAR DEFLECTIONS HS 1580 LONG CRANK PIN HS 1581 SHORT CRANK PIN DEFLECTION - DEGREES TORQUE - LB-FT I D A C B MB | ||
| scan0090 | Blueprint of a model crankshaft to determine the effect of a long crank pin on torsional stiffness. | ||
| View original record | Hs 1580/1. 4.000 1.500 1.000 .300 .625 DIA 1.125 DIA .050 R 'A' .500 DIA. 1.000 DIA. 3.500 DIA. .350 6 HOLES EQUALLY SPACED .3125 DIA ON 3.000 DIA CTS. BOTH ENDS SIMILAR 1 OFF WITH 'A' = 2.850 HS.… | ||
| scan0091 | Blueprint illustrating three different designs of Bentley crankshafts. | ||
| View original record | BENTLEY CRANKSHAFTS 7 BEARING - STANDARD. 7 BEARING - NARROW PIN. 4 BEARING - NARROW PIN. | ||
| scan0092 | Analysis of seven-bearing crankshafts, comparing component inertia and stiffness for different balance configurations. | ||
| View original record | To H. c. to Wor. c. to By. c. to Rg. 427 Hs/Gry.21/KW.29.1.35. Seven Bearing Crankshafts. We have been looking into whether it is possible to raise the critical speed of the narrow pin Bentley… | ||
| scan0093 | Page from a report analyzing the relationship between web thickness, stiffness, and inertia, including calculations. | ||
| View original record | -2- Hs/Gry.31/KW.29.1.35. From these figures one can predict immediately the effect say of doubling the web thickness, in which case the equivalent length becomes 6½ instead of 9 and the inertia 18½… | ||
| scan0094 | Comparison of weights for two different types of crankshafts. | ||
| View original record | x217 22.3.35. Crankshaft Weights. lbs. ozs. Narrow Pin Type, Ex.1408| 47 6 Standard Bentley, EB.1083 45 6 Difference in weight = 2 0 | ||
| scan0095 | Request to produce parts to increase the inertia of a Bentley crankshaft damper for high-speed roughness experiments. | ||
| View original record | To RHC. x217 Hs/Gry.27/KW.8.4.35. Will you please put in hand the necessary parts for in creasing the inertia of a Bentley crankshaft damper to Hs.1894. We require this in connection with experiments… | ||
| scan0096 | Crankshaft design improvements for the Bentley 3.5' bore engine. | ||
| View original record | To E. c. to Wor. c. to Da. c. to By. c. to Hdy. 4217 Bentley Crankshafts. When re-designing the Bentley engine for 3.5" bore we think it would be a good opportunity to incorporate various crankshaft… | ||
| scan0097 | Crankpin length, lubrication improvements, and oil cooling recommendations for an engine. | ||
| View original record | -2- Hs/Gry.1/KW.29.6.35. When we suggest a crankpin length of 1.125" we are basing this on 20 hours endurance on a 1" pin on the standard 3½" bore engine. Failures on the 10,000 miles car only… | ||
| scan0098 | Blueprint comparing a suggested crankshaft for a 3.5 Bore Engine against an existing narrow pin crank. | ||
| View original record | [ "2.500 DIA", "1.125", "SUGGESTED CRANK FOR", "3.5 BORE ENGINE", "EXISTING NARROW PIN CRANK", "ROLLS ROYCE LTD", "PRINT ROOM", "JUL 28 1925", "DERBY" ], | ||
| scan0099 | Confirming a request for big end oil flow tests on a Bentley crankshaft. | ||
| View original record | Hs/W.Bell: (x21) Hs/Gry.14/KW.12.7.35. Big End Oil Flow Tests. This is to confirm our conversation asking you to determine the oil flow to the big end of a Bentley crankshaft running at 4500 r.p.m. If… | ||
| scan0100 | Crankshaft dimensions for a large bore Bentley engine. | ||
| View original record | To E. X217 Hs/Gry.16/KW.17.7.35. Bentley Crankshaft. With regard to the crankshaft for the large bore engine, we are of the opinion that it would be advisable to have 1.250" wide crankpins. There is… | ||
| scan0101 | Calculations for new crankshafts comparing the effect of different journal and pin dimensions on engine speed. | ||
| View original record | Calculations for new crankshafts based on - (1) Effect of 2.5 dia. journals on existing crank raises speed 150 r.p.m. (2) Narrow 1" pin crank speed 5320 r.p.m. (3) Relative stiffness of 2.5 journals… | ||
| scan0102 | Comparison table of projected bearing areas, critical speeds, and crankpin areas for various component configurations. | ||
| View original record | PROJECTED BEARING AREAS FRONT | INTER | CENTRE | REAR | STIFFNESS | CRITICAL SPEED | CRANKPIN AREA STANDARD | 3.54 | 2.58 | 3.72 | 4.05 | | 5,000 | 2.750 2.5 DIA JOURNAL 1.125 WIDE PINS | 4.9 | 3.8 |… | ||
| scan0103 | Instruction to investigate cracks in a large bore Bentley crankcase by cutting it up and testing a sample. | ||
| View original record | X 217 To RHC. c. to Lab. (Mr. Bradbury). Hs/Gry.19/KW.19.7.35. LARGE BORE BENTLEY CRANKCASE. With regard to the cracks in the first of the two crankcases in B-15 unit; i.e., the one which has been… | ||
| scan0104 | Letter to a supplier regarding an unsatisfactory crankshaft damper friction lining, requesting experimental cork washers. | ||
| View original record | X 217 Exptl. Dept. Hs/Gry.12/KW. 4th September,1935. Messrs. Ogden & Co.,. 12, Hanover St.,. Shudehill, Manchester. Dear Sirs, We are sending you a drawing of the friction lining we use for the… | ||
| scan0105 | Requesting the preparation of a Bentley crankshaft pin for a cold storage bearing test. | ||
| View original record | To RHC. X217 HS/Smth.16/KW.9.10.35. We understand that you are having a Bentley crankshaft cut up in order to make a rig. Will you please have one of the pins fitted with a conn. rod with a Hall's… | ||
| scan0106 | The distribution of L.O.P. and details for the Large Bore Bentley Chassis crankshaft. | ||
| View original record | To: [struck through text] c. Hs/Gry. Rm x217 BY/CS15/EH.26.11.35. Re Large Bore Bentley Chassis - Crankshaft - Sec;5010. Please receive herewith the following new L.O.P. and detail, to be instructed… | ||
| scan0107 | Request to manufacture a crank pinion with a 45° helix angle for an increased inertia crankshaft damper, to be fitted to a Bentley B-19 unit. | ||
| View original record | To RHC. x217 Hs/Mths.22/KW.2.12.35. Increased Inertia Crankshaft Damper (Bentley). Will you please arrange to make a crank pinion for this Damper, cut with 45° helix angle, for use when the damper is… | ||
| scan0108 | Balancing a Bentley crankshaft, based on methods from Packard and outlining required experiments and modifications. | ||
| View original record | To RHC. x 217 Hs/Gry.3/KW.10.3.36. Bentley Crankshaft. While I was in America the Packard people explained to us that we could balance the 7 bearing crankshaft with less inertia than in our present… | ||
| scan0109 | Achieving better crankshaft balance with less counterweights, with a conclusion to test on aero engines. | ||
| View original record | EXPERIMENTAL DEPARTMENT REPORT. X217 REFERENCE :- Hs/Gry.18/RW.20.5.36. Subject of Report:- Better Crankshaft Balance with less counterweights. General Conclusions :- Should be run on 10,000 miles… | ||
| scan0110 | Short memo confirming a copy of a previous memo and sketch was handed to Gry. | ||
| View original record | Hs/Gry.18. 20.5.36. A copy of this memo was made and handed to Gry. under note Ev.1/Js. 22.7.57., with a revised copy of the sketch. | ||
| scan0111 | Static deflection tests for a new method of positioning crankshaft balance weights on a Bentley crankshaft. | ||
| View original record | Copy Ha/Gry.18/RW.20.5.36. A new method of positioning Crankshaft Balance Weights. While in Detroit, Packard's told us in connection with crankshaft balance that the orthodox method of calculating… | ||
| scan0112 | Crankshaft balancing schemes, counterweights, and vibration analysis for an engine. | ||
| View original record | -2- We ought therefore to be able to obtain the conditions of 100% balance with 4 weights only as on R.M.89 of 71% of the rotating loads. R's light weight scheme assumes the crankshaft to be… | ||
| scan0113 | Blueprint detailing the method of fitting Packard type balance weights to a Bentley crankshaft. | ||
| View original record | PINS 3 & 4. ON WEBS 1 & 12. 20° PINS 1 & 6. ON WEBS 6 & 7. METHOD OF FITTING PACKARD TYPE BALANCE WEIGHTS RM.89 TO BENTLEY CRANKSHAFT. | ||
| scan0114 | Comparison of a standard Bentley crankshaft and a Bentley crankshaft with Packard balance weights. | ||
| View original record | Handwritten: 217 Bentley Crankshaft file. Top label: WITH PACKARD WEIGHTS 108 LBS. Bottom label: STANDARD SHAFT 104 LBS. Information card: COMPARISON OF STANDARD BENTLEY CRANKSHAFT & BENTLEY… | ||
| scan0115 | Outlining an experiment to determine the inaccuracy in crankshaft balancing caused by an initial shaft bow. | ||
| View original record | X47 To RHC. Hs/Std.17/KW.24.4.36. Crankshaft Balance. We wish to determine the inaccuracy introduced into dynamic crankshaft balancing by the initial bow in our crankshafts. Since it is not… | ||
| scan0116 | Design proposal for Packard-type balance weights for a Bentley crankshaft, machined from existing forging, requesting an experimental test. | ||
| View original record | QAY X217 BY. c. Hs/Rm. RHC. Ws. E/JNR.3/HP.25.5.36. Bentley Crankshaft - Hs/Gry.18/KW.20.5.36. With reference to the above report, we have made a design to LeC.5139 showing the Packard type of balance… | ||
| scan0117 | Instructions and drawings list for a Bentley chassis crankshaft experiment using Packard Type balance weights. | ||
| View original record | X27 ~~To RROC~~ ~~Illegible~~ c. Hs/Gry. BY/GSS/EH.11.6.36. Re Bentley Chassis - Crankshaft - Section 5010. LeC.5139 - Packard Type Balance Weights. (Temporary Scheme using Existing Forging.) Please… | ||
| scan0118 | Letter to Federal Mogul Corp. regarding a drawing of a Bentley crankshaft for White Metal Bearings. | ||
| View original record | 8217 Expl. Dept. Rm/Gry.5/MJ. 28th. October, 1936. The Federal Mogul Corp. Ltd., Detroit, Michigan, U.S.A. For the attention of Mr. Rodgers. Dear Sir, We are sending you herewith a drawing of our… | ||
| scan0119 | Scoring on Bentley crankshafts with Hall's metal bearings and proposing a standardized treatment. | ||
| View original record | To BY. From Rm. K 217 Rm.20/MJ.2.11.36. BENTLEY CRANKSHAFTS AND HALL'S METAL BEARINGS. There is no doubt that crankshafts are likely to be more deeply scored with Hall's metal bearings than with White… | ||
| scan0120 | Technical memorandum on the satisfactory method for regrinding crankshafts. | ||
| View original record | Rm/Swd1.18/JH.2.11.36. CRANKSHAFTS. With regard to regrinding of crankshafts, this is not really a satisfactory job in that it is generally found that after considerable running the crankshaft is… | ||
| scan0121 | Request to test a 'Hykro' crankshaft against a standard V.C.M. shaft for wear over 15,000 miles. | ||
| View original record | To RHC. 217 Rm/Swd1.26/JH.3.11.36. Bentley. Will you please put in hand a "Hykro" crankshaft with a view to running a 15,000 miles test. We are interested to compare it for wear against the standard… | ||
| scan0122 | Calculation of the stiffness ratio for a proposed Bentley crankshaft compared to the standard. | ||
| View original record | 217 E. from Rm/Gry. Rm/Gry12/R.1.12.36. Proposed Bentley Crankshaft. We have calculated the stiffness of the suggested 2 1/2" dia. journal crankshaft having 1/8 narrower pins and 1/16th narrower webs.… | ||
| scan0123 | Dispatch of crankshaft components for the 25/30 and Bentley models. | ||
| View original record | 217 CGRY. BY c. Rm. HPS. E/JNR.1/HP.17.12.36. 25/30 and Bentley Crankshaft. We send you herewith:- LeC.5433 - Crankshaft bearings, caps, and crank-case for the crankshaft with increased diameter… | ||
| scan0124 | Arguing for the use of 'Hykro' material for Bentley 25/30 HP Chassis crankshafts. | ||
| View original record | Lide Hs. [crossed out] Rm. BY/EM. [crossed out] BY/Cgh [crossed out] 217 Swdl Where is our Hycro crank Rm BENTLEY AND 25/30 HP. CHASSIS - RE: MATERIAL FOR CRANKSHAFTS I am of the opinion that we… | ||
| scan0125 | Instruction to modify a standard Bentley crankshaft by drilling additional holes to improve bearing lubrication. | ||
| View original record | 217. To HPS. Rm/Swdl.12/JH.8.1.37. BENTLEY CRANKSHAFT. Will you please instruct that a standard crank be drilled in the following manner for experiment on improving the bearing lubrication. Instead of… | ||
| scan0126 | Crankshaft failure at the flywheel flange and analysis of related failures. | ||
| View original record | B 217. To Rm. from HPS/RH. c.c. to HPS. c.c. to Hm/Swdl. HPS/RH.1/CB.19.2.37. UNIT B.19. CRANKSHAFT FAILURE. Crankshaft EB.1083 modified to EB.2687 4004.A. R.R.14 - VCM. On dismantling the above unit… | ||
| scan0127 | Blueprint detailing a crankshaft failure, showing test results, running time, and views of the broken component. | ||
| View original record | UNIT. B19 CRANKSHAFT FAILURE EX1129 CRANKSHAFT EB1083 MODIFIED EB2687 V.C.M. 4004 A RR14. PASSED TO TEST 27-1-36 RUNNING TIME:- 149 HRS 5 MINS AT FULL THROTTLE 10 HRS 50 MINS AT 1/4 LOAD 299 1/2 HRS… | ||
| scan0128 | Crankshaft forgings for the 25/30-HP and Bentley 'L' Series chassis. | ||
| View original record | DHG. c. to Rm. c. to BY. 917. Swift Files When is large crank? ROY/MS3/P.9.3.37. 25/30-HP AND BENTLEY CHASSIS. We are informed by English Steel Corporation that the whole of the material for producing… | ||
| scan0129 | Testing and standardisation of crankshafts for 25/30 & Bentley models. | ||
| View original record | 217. To Roy. from Rm/Swdl. Rm/Swdl.1/AP.12.3.37. 25/30 & Bentley Crankshafts. In reply to memo Roy/Ms.3/P. 9.3.37. The first experimental Bentley unit fitted with the larger crankshaft will not be on… | ||
| scan0130 | Confirming the decision not to standardise larger crankshafts for the 25/30 HP and Bentley chassis at the present time. | ||
| View original record | 217. ROY/Ms. c. Rm. c. Rho. BY/Cgh.7/W.15.3.37. 25/30 H.P. and Bentley Chassis. With reference to ROY/Ms3/P.9.3.37, we have discussed the matter with Rm/Gry., who informs us that it is not proposed to… | ||
| scan0131 | The method of recovering worn or bowed nitrided crankshafts. | ||
| View original record | Rm. [Strikethrough] Hd. [Strikethrough] Sft. [Strikethrough] Swell ------- ? 217 BY.2/G.6.11.36. NITRIDED CRANKSHAFTS. RE: METHOD OF RECOVERING WORN SHAFT. --------------------------- Referring to… | ||
| scan0132 | Report on a crankshaft flange failure. | ||
| View original record | 217 E. from Rm. Rm1/R.17.6.37. Herewith a report from the Shop on crankshaft flange failure. We should be more alarmed by this if we had had any such failures on the road. However, the only crankshaft… | ||
| scan0133 | Failure of a Bentley crankshaft due to an unsatisfactory nitriding process, resulting in insufficient hardness. | ||
| View original record | 294/217 Rm/GWH. c. RHG. c. Rm. BY.14/G.2.12.37. BENTLEY CRANKSHAFT FROM B.102-KT. - MILEAGE 4900. Referring to your memo Rm/GWH.16/N.22.11.37. we confirm your findings in every respect. The cause of… | ||