Rolls-Royce Archives
| Identifier | Entry | ||
| scan0001 | Modification for the E.A.C. 2 engine involving floating piston pins with aluminium plugs. | ||
| View original record | X.9040 X8040 To HS. BY. FROM R. C. to CJ. BJ. RG. WOR. PN. S E C R E T. R2/M18.7.24. RE. PISTONS. E.A.C. 2. ENGINE. X.9040 X8040 We are sending you a modification shewing a floating piston pin with… | ||
| scan0002 | Floating piston pins with spherical ends for E.A.C.11 and Goshawk 11 pistons. | ||
| View original record | To BY. from E. c. to CJ. HS. X8040 S E C R E T. E2/M18.7.24. E.A.C.11. AND GOSHAWK 11. PISTONS. X.4224 X.9040 X8040 We send you herewith drawing No.LeC.1901., shewing floating piston pins with… | ||
| scan0003 | Secret memo discussing modifications to pistons, connecting rods, induction pipes and magnetos. | ||
| View original record | To BY/C. from E. c. to Hs. X8090 (crossed out) S E C R E T. E3/M17.7.24. E.A.C.11. PISTONS AND CONNECTING RODS. (Numbers to the right are crossed out: X.9030, X.9040, X8030, X9090) In reply to your… | ||
| scan0004 | Secret memorandum regarding modifications to pistons and connecting rods for the 46-PK engine. | ||
| View original record | X8040 To CJ. from R. c. to BJ. Wor..Rg. Hs. Da. E. BY. PN. H. EP. C. S E C R E T. R2/M12.7.24. EAC.11. RE. 46-PK. RE. PISTONS AND CON. RODS. X.9030 X8030 X.9040 X8040 The engine of 46-PK was fitted… | ||
| scan0005 | Engine modifications using longer connecting rods and shorter pistons. | ||
| View original record | To BY. from E. c. to CJ. HS. SECRET. E1/M3.6.24. X.9030 X.9040 EAC.11. ENGINE. LONGER CONNECTING RODS & SHORTER PISTONS. We send you herewith drawing No. LeC.1879 dealing with the above alterations.… | ||
| scan0006 | The modification of car 93-NK with new EAC.11 components at the request of the sales department. | ||
| View original record | R.R. 408A (20H) (D.A. 652 20-3-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X8040 REF HS2/LG27.10.24. To R. from Hs. c. to CJ. BJ. c. to E. DA. c. to BY. Wor. S E C R E T. X8770 E.A.C.11. X8040 Sales… | ||
| scan0007 | The expected performance and final approval process for production car EAC.11. | ||
| View original record | contd :- -2- This car, when completed should represent as regards performance and quality of running what we can expect from the production EAC.11. We are hoping to have this car ready in 2 weeks… | ||
| scan0008 | Design and effectiveness of different types of piston rings for oil scraping. | ||
| View original record | Hs. from E. C.S. C.R. (at Le Canadel) C.B. C.Rg. Y8040 E1/W3. 3. 25 SECRET. E.A.C. PISTON RINGS. The explanation advanced for the bevelled piston ring scraping oil apparently in the wrong direction is… | ||
| scan0009 | Secret memorandum regarding revised floating piston pins with spherical ends for E.A.C. & 20 HP engines. | ||
| View original record | X8040 BY c. CL c. Hs. E18/H. 3. 3. 25. Secret. E.A.C. & 20 HP Engines. ---------------------------------- Floating Piston Pins with Spherical Ends. Revised.… | ||
| scan0010 | Piston failure during 'V' Series tests in France. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. K8040 REF: Hed/L/GS. 3. 2. 5. To R. from Hs. c. to CJ. BJ. c. to RC. K. c. to DA. RY. c. to Wor. SECRET. 48940 EAC 'V' SERIES -… | ||
| scan0011 | Piston failure in car 98-NK during 'V' series tests in France. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. +8040 REF: Hel/LG7.3.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. SECRET. EAC. 'V' SERIES - TESTS IN… | ||
| scan0012 | Secret memo regarding modifications to E.A.C. pistons, concerning gudgeon pin fit and design to prevent breakage. | ||
| View original record | Secret. X8040 c.Mr. Shelton. c.Hs. BY6/H. 9. 3. 25. E.A.C. PISTONS. As there may possibly be some modifications required to the piston in the near future, from two points of view:- a/- Fit of the… | ||
| scan0013 | The analysis of a fractured 'EAC' piston. | ||
| View original record | R.R. 493A (50n) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. Y8040 REF. Hs/ACL1/LG9.3.25. To R. from Hs/ACL. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. RE. FRACTURED… | ||
| scan0014 | Diagram showing the cross-section of a fractured piston with area calculations. | ||
| View original record | SECTION ACROSS WHICH PISTON FRACTURED E.A.C. AREA .920 ☐" B AREA .920 ☐ B AREA .72 ☐" TOTAL AREA 2.56 ☐" | ||
| scan0015 | Blueprint showing a cross-section of a fractured E.A.C. piston. | ||
| View original record | THE FRACTURED E.A.C. PISTON. LINE OF FRACTURE FOLLOWING LINE OF CHANGE OF SECTION WT. OF PISTON HEAD COMPLETE WITH RINGS, ABOVE AA = 1.09 lbs. | ||
| scan0016 | Graph of oil consumption curves for an E.A.C. engine, comparing different piston ring configurations. | ||
| View original record | OIL CONSUMPTION CURVES FOR E.A.C. ENGINE RUNNING 3/4 FULL LOAD AVGE. OIL TEMP 60°C PISTONS & RINGS USED FOR STANDARD RING STD. PISTON RINGS L RING STD. PISTON WITH 'L' SECTN RINGS SCHEME EX. 280-I… | ||
| scan0017 | Oil consumption tests for the EAC engine, focusing on piston ring modifications. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 48040 REF: HS2/LG1S.3.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. HY. c. to Wor. S E C R E T. OIL CONSUMPTION FOR… | ||
| scan0018 | Piston failure due to high engine speeds and potential design improvements. | ||
| View original record | X. 8040 To E. HS. } FROM R. BY. S E C R E T A RL/M16.3.25 E. A. C. PISTON FAILURE AND SCRAPER RINGS. This is quite a reasonable failure due to high engine speeds and explosions causing concentrated… | ||
| scan0019 | Piston ring design to manage wear through unequal surface pressure. | ||
| View original record | contd :- -2- E. will understand my sketch. You will also remember that the idea of bevelling the ring or any scheme for unequal surface pressure, will wear wrongly. It has occurred to me that a way to… | ||
| scan0020 | Secret memo discussing drawings for piston modifications, including an experimental reinforced type. | ||
| View original record | To BY. from E. c. to CJ. HS. X. 8040 S E C R E T. E. A. C. E2/M18.3.25. PISTONS. X. 8040 Please find attached drawings LeC. 2029 and 2030., shewing the proposed modifications to piston. The former is… | ||
| scan0021 | Secret memo proposing to start a 10,000-mile test on car 93-NK with modified die-cast pistons for the EAC 'V' series. | ||
| View original record | X8040 To CJ. from Hs. C. to BJ. [REDACTED] C. to PA [REDACTED] C. to Wcr. [REDACTED] C. to EY. [REDACTED] S E C R E T. Hs7/LG18.3.25. 10,000 MILES TEST ON EAC 'V' SERIES. R. in his recent memos, has… | ||
| scan0022 | Reducing engine oil consumption and smoke by fitting 'L' shaped piston rings. | ||
| View original record | R.R. 493A (50n) (D.B. 175 25-9-24) J.H.D. X8040 EXPERIMENTAL REPORT. Expl. No. REF: Hs5/LG18.3.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. X8040 X8980 EAC+ 'V'… | ||
| scan0023 | Graph of oil consumption curves for an E.A.C. engine, comparing different piston and ring configurations. | ||
| View original record | OIL CONSUMPTION CURVES FOR E.A.C. ENGINE I.E.A.C. II Eng. Running at 3/4 FULL LOAD. COMPARISON: STD PISTONS & RINGS Po. STD PISTONS WITH "L" SECTION RINGS AND SCRAPER. OIL TEMP AT SUPPLY TO BEARINGS -… | ||
| scan0024 | Graph comparing oil consumption curves for an E.A.C. engine with different piston and ring setups. | ||
| View original record | OIL CONSUMPTION CURVES FOR E.A.C. ENGINE. I.E.A.C.II 3/4 LOAD COMPARISON: PISTONS Ex. 280 & RINGS Ex. 281. AND PISTONS Ex. 280 & "L" SECTION RINGS. TEMP. OIL SUPPLY TO BEARINGS 60°C. CYL. WATER TEMP.… | ||
| scan0025 | 10,000-mile test for the EAC 'V' Series, concerning piston modifications and vehicle testing. | ||
| View original record | R.R. 493A (50R) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No: X8040 REF: Hs7/LG18.3.25. To CJ. from Hs. c. to BJ. DA. c. to E. Wor. c. to EY. S E C R E T. 10,000 MILES TEST ON EAC. 'V'… | ||
| scan0026 | Secret memo discussing proposed modifications to piston designs. | ||
| View original record | X. 8040 To R. from E. S E C R E T. E1/M18.3.25. c. to CJ. HS. E. A. C. PISTONS. Please find attached blue prints of drawings LeC. 2029 and 2030., shewing the modifications to the piston. These… | ||
| scan0027 | Secret memorandum with a diagram suggesting a modification to a piston design. | ||
| View original record | X. 8040 To E. from R. c. to CJ. BY. c. to HS. S E C R E T. E. A. C. PISTON. X. 8040 No proposals received regarding the above. I suggest increasing the diagonal web substantially at split side only,… | ||
| scan0028 | Confirmation of a wire with instructions for modifying a piston for multiple scraper rings. | ||
| View original record | X8040 CONFIRMATION OF WIRE. HIVES & BAILEY. ROYCAR. DERBY. WEST WITTERING. 20. 3. 25. LEAVE ENOUGH METAL INSIDE PISTON FOR HORIZONTAL SAWCUT TO COME ONE INCH ABOVE GUDGEON PIN LEC. 2035. FOR MULTIPLE… | ||
| scan0029 | Confirmation of a wire recommending the inclusion of Piston LEC. 2030 on the next ten thousand units. | ||
| View original record | X8040 CONFIRMATION OF WIRE. WEST WITTERING. 20. 3. 25. HIVES. ROYCAR. DERBY. RECOMMEND INCLUDING PISTON LEC. 2030. ON NEXT TEN THOUSAND IF POSSIBLE. ELLIOTT. | ||
| scan0030 | Micro-examination and analytical report on a failed E.A.C. Piston. | ||
| View original record | X8040 Micro-Examination and Analytical Report. Hs. .. H113/EA20325 Laboratory. c to By. Re E.A.C. Piston which failed on Test. The above piston was broken in two at the circumferential slit. The… | ||
| scan0031 | Alterations to pistons, including ring stops, ring stiffness, and balancing. | ||
| View original record | X.8040 To R. from E. c. to CJ. HS. BY. S E C R E T E1/M20.3.25. E. A. C. PISTON. We received your memo. shewing sketches of alterations to pistons, and we believe that Lec.2030 which we had already… | ||
| scan0032 | Secret memo regarding an improved, strengthened piston with five oil-retaining rings. | ||
| View original record | To BY. from E. c. to CJ. HS. X. 8040 S E C R E T. E. A. C. PISTONS+ E2/M20.3.25. We send you herewith LeC. 2035., shewing the improved strengthened piston with 5 rings arranged for oil retaining, all… | ||
| scan0033 | Arranging a visit to Derby to inspect car 93-NK with the latest parts, including new pistons. | ||
| View original record | To E. } To DA. } FROM HS. c. to CJ. BJ. c. to BY. Wor. X8040 Hsl/LG31.3.25. VISIT TO DERBY. X8770 X8040 We suggest it would be useful if you could arrange to be in Derby on Tuesday or Wednesday next… | ||
| scan0034 | Authorisation sheet number 1 for the 'V' series regarding consent for a new piston. | ||
| View original record | Secret. X8040 Hex. Sft. Hs. Wd. BY/Mr.McStay. BY6/H. 23.3.25. "V" SERIES. AUTHORISATION SHEET NUMBER 1. We have received CJ's consent by telephone to bringing in the new piston we instructed on… | ||
| scan0035 | Authorisation sheet for a 'V' Series piston modification and 10,000-mile test. | ||
| View original record | Secret. X8040 E.J. [crossed out] c. Wor. [crossed out] c. Hs. [crossed out] BY4/H. 23.3.25. "V" SERIES. AUTHORISATION SHEET NO.1. ************************************ We have received a modification… | ||
| scan0036 | Patent claim for an 'L' section piston oil scraper ring, discussing its function and origin. | ||
| View original record | *744 +8020 BY/NW. c. Hs. BY10/H. 23.3.25. PISTON - OIL SCRAPER RINGS. ------------------------- I am of the opinion that we should put in a claim for a combination involving an "L" section ring with… | ||
| scan0037 | Piston design, oil consumption, and potential improvements for piston failures. | ||
| View original record | To E. from R. c.c. to CJ. RG. BY. c.c. to Hs. 48040 S E C R E T. R1/M23.3.25. E+ A. C. X. 8040 X. 8980 X741 PISTONS AND OIL CONSUMPTION. Regarding pistons and oil consumption, since tests shew it is… | ||
| scan0038 | 'EAC' engine overoiling issues, comparing them with 40/50 and 20 HP models. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. x8040 REF: Hs/A.G.25. 2.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. 'EAC' ENGINES… | ||
| scan0039 | Piston ring performance, oil consumption, and scraper ring design. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs1/L025.3.25. If we place an EAC. cylinder block on the bench and fit to one bore a piston fitted with standard rings… | ||
| scan0040 | Adjustments to engine oil pressure and oil consumption test results. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF. Hsl/LG25.3.25. It will be necessary to reduce the amount of oil to the rockers on the EAC. At present we have three… | ||
| scan0041 | Secret memo discussing various design suggestions for scraper rings and pistons. | ||
| View original record | X. 8040 S E C R E T. R1/M31.3.25. To E. HS. from R. c. to CJ. RG. BY. RE. EAC. PISTONS. Re. scraper rings we do not know any scheme of ring that can have one edge more heavily loaded than another,… | ||
| scan0042 | Design of pistons, specifically scraper rings and piston pin size and fit. | ||
| View original record | To E. & RG. from R. c. to CJ. DA. BY. c. to hs. +80240 S E C R E T. EAC. AND INDIA. RE. PISTONS. X.8040 X.5040 I think we ought to add no more weight than we are forced to do. My all-scraper ring… | ||
| scan0043 | 'V' Series engine oil consumption, comparing the performance of new pistons against original designs and different oiling methods. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. X8070 Expl. No. REF: Hs4/L.C1.4.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. EY. c. to Wcr. S E C R E T EAC. 'V' SERIES - OIL… | ||
| scan0044 | Confirming production status and component suitability for 'V' Series Pistons. | ||
| View original record | X8040 BYS/H. 2.4.25. **************** PISTON - "V" SERIES. **************** In confirming our previous memo where we agree that Casting E.73376 can be produced but not machined, we would like to add… | ||
| scan0045 | Piston design approval following satisfactory oil consumption reports from France. | ||
| View original record | X8040 Mr. Sherton. C.W. C. Sft. c. Hs. BY/O/H. 3.4.25. PISTONS. Further to my two previous notes on pistons, in which I released the Piston casting, the rings and the gudgeon pin, Hs. has received… | ||
| scan0046 | Secret memo regarding the design and testing of a double ring piston. | ||
| View original record | X. 8040 To R. from E. c. to CJ. Hs, c. to BY. S E C R E T. E1/M4.4.25. E. A. C. RE. DOUBLE RING PISTON. Regarding the above we have already given verbal instructions and dimensions when in Derby for… | ||
| scan0047 | Experimental, grooved piston ring stop suggested by Mr. Royce. | ||
| View original record | X80240 Secret. DY. c. Hs. c. GC. E7/H. 8.4.25. E.A.C. PISTON RING STOP. We send you herewith LeC./2046 showing a grooved type of stop recently suggested by Mr.Royce, whereby the gap between the piston… | ||
| scan0048 | 'V' series engine oil consumption, detailing tests with baffles and different piston ring configurations. | ||
| View original record | C.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X8040 REF: Hs4/LG8.4.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T. 'V' SERIES - OIL… | ||
| scan0049 | The performance of 'L' shaped rings and their relation to engine oil consumption. | ||
| View original record | P.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs4/LG8.4.25. can say conclusively whether this is correct. We are still keeping one car running fitted with 'L'… | ||
| scan0050 | 'V' series pistons, detailing ring failures and oil consumption tests. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. x8040 REF HS5/LG15.4.25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. S E C R E T EAC. 'V' SERIES -… | ||
| scan0051 | Piston ring design and its effect on oil consumption. | ||
| View original record | X.8040 To HS. & E. FROM R. c. to CJ. BY. S E C R E T. R7/M15.4.25. E. A. C. PISTON, & OIL CONSUMPTION. X. 8040 X. 8980 It is very undesirable to have any of the faked systems that I and others have… | ||
| scan0052 | Comparing different piston and ring configurations, focusing on oil consumption and performance. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. +8040 REF: Hs5/LG22. 4.25. S E C R E T. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. EAC. 'V' SERIES -… | ||
| scan0053 | Experiments on piston designs and oil control methods. | ||
| View original record | 48040 To BY. from E. c. to CJ. Hs. S E C R E T. E2/M28.4.25. E. A. C. X.8040 X.8980 PISTON WITH CONCAVE CROWN AND LOWER SCRAPER RING. We send you herewith LeC.2055 shewing the above. The following… | ||
| scan0054 | Alteration of a conical top piston to incorporate a lower scraper ring for testing purposes. | ||
| View original record | To BY. from E. c. to CJ. Hs. X. 8040 S E C R E T. EB/M29.4.25. E. A. C. PISTON. In case it is required to use the existing conical top piston with the lower scraper ring we send you herewith LeC.2053.… | ||
| scan0055 | Extract detailing proposed design changes to address excess oil consumption. | ||
| View original record | Extract from R1/M29.4.25. (X.8770 X.2565.) X8040 EXCESS OIL CONSUMPTION EAC. X.8980 X.8040 So far the only thing which has shewn an improvement is the L. shpaed ring, but we fear these may not be… | ||
| scan0056 | Extension of production for pistons and fabric couplings for the 'V' Series Chassis. | ||
| View original record | Hs. X8040 BY11/H. 30.4.25. "V" SERIES CHASSIS. 101 ONWARDS. It is important that we should extend if possible the 100 sets of pistons and fabric couplings which have been agreed to It does not appear… | ||
| scan0057 | Oil consumption tests for 'V' series and Condor engine 'L' shaped piston rings. | ||
| View original record | R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HsL/LG1.5.25. X8040 To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wcr. S E C R E T. EAC. 'V' SERIES - AND… | ||
| scan0058 | The manufacture of 'V' Series Pistons, proposing an order for 100 more sets and considering an alternative to knurling. | ||
| View original record | Sft. c. Hs. S. By/S. O. Wd. +D040 BY15/H. 8.5.25. -------------- "V" SERIES PISTONS. ------------------- We have no solution of the piston question in sight which would modify in the slightest the… | ||
| scan0059 | Oil consumption issues related to 'L' shaped piston rings and the effects of lapping. | ||
| View original record | R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 48040 REF: Hs4/LG13.5.25. to R! from Hs. c. to CJ. BJ. c. to RG. BY. c. to E!. DA. c. to Wor. EAC: OIL CONSUMPTION. x8980 We… | ||
| scan0060 | Production of 'V' Series pistons (E.73376) for the last 100 chassis. | ||
| View original record | X6040 Sft. Hs. BY/GS Wor. BY10/H. 27.5.25. "V" SERIES PISTONS. (E.73376.) -------------------- We know of no modification to the piston which can possibly be brought in for the last 100 chassis in "V"… | ||
| scan0061 | The testing of magnesium pistons, detailing weight savings and cracking issues. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. +8040 EXPERIMENTAL REPORT. Expl. No. REF: HS9/LG23. 7. 25. To R. from Hs. c. to CJ. BJ. c. to RG. E. c. to DA. BY. c. to Wor. MAGNESIUM PISTONS. Magnesium… | ||
| scan0062 | The investigation of 'knocks' on the Phantom chassis. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. +8040 EXPERIMENTAL REPORT. COPIES TO: R.CJ. BJ. WOR. By. E. Da. EP. PN. OY. Expl. No. +4190 REF. Hs1/LGS.10.25. OBJECT OF TEST. Investigation of 'knocks' on… | ||
| scan0063 | The investigation of piston knocks. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs/ACL/LGS.10.25. PISTON KNOCKS. We have been troubled with what appeared to be piston knocks. The symptoms however are… | ||
| scan0064 | The causes of engine knock related to piston fit, oil film, and piston design. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LGS.10.25. The knock, though to a much lesser degree, can be produced very simply by moving a piston attached… | ||
| scan0065 | Piston clearance, slap, and skirt flexibility. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF Hs/ACL/LGS.10.25. overcame the trouble. Even with this increased clearance .003 to .004", there was no evidence of… | ||
| scan0066 | Piston troubles discovered on the 'Phantom' model during test bench conditions. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. K8040 EXPERIMENTAL REPORT. COPIES TO: RCJ BJ WOR By E. Da EP. PN OY. RG Expl. No. 14190 REF. Hs4/LG12.10.25. OBJECT OF TEST. Piston troubles on 'Phantom'.… | ||
| scan0067 | Piston knocks, confirming the theory that a flexible skirt is required for silent operation. | ||
| View original record | R.R. 493a (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF. HS/ACL/LG101025. PISTON KNOCKS - E.A.C. Continuing our experiments on pistons the results obtained up to the present time… | ||
| scan0068 | The performance of standard pistons modified with a split skirt. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: Hs/ACL/LG101025. gave us quite good results. They are as follows :- Standard pistons with the skirt split on both… | ||
| scan0069 | Piston modifications to improve flexibility and reduce knocking. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF. HS/AJL/LG101025. attempt was made to make the skirt more flexible by cutting away the stiffening rib, which runs… | ||
| scan0070 | And comparing various piston designs, including a patented design with inclined stays. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF HS/ACL/LG10.10.25. during the 24 hours record. We hope later to have more inform- ation regarding these. It will be… | ||
| scan0071 | Piston design, discussing gudgeon pins and composite materials. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -5- Expl. No. REF:Hs/ACL/LG101025. for our experiments and at the same time retain the same desirable characteristics. Another advantage… | ||
| scan0072 | Various solutions to resolve piston knock trouble in the Phantom engine. | ||
| View original record | To Hs. from R. c. to CJ. BY. +8040 R5/M15.10.25. PHANTOM PISTON TROUBLE - KNOCK. X.41990 X.8040 (1) These pistons were O.K. on Silver Ghost and Goshawk, but imperfections are manifest. (2) Make no… | ||
| scan0073 | Awaiting the results of piston modifications to prevent knocking and piston pin difficulties. | ||
| View original record | To Hs. from R. X. 8040 R3/M18.11.25. MODIFIED PISTONS. We are anxiously awaiting the result of the modification to the pistons (giving the opportunity of greater flexibility of skirt), to prevent… | ||
| scan0074 | The production and testing of new die-cast pistons for the Phantom model. | ||
| View original record | Hs. C. Ge. C. Wks. X.8040 NEW PHANTOM. DIE CAST PISTONS. The Experimental Dept. have now succeeded in obtaining pistons which appear to be sufficiently close to drawing to use. I suggest that Ge.… | ||
| scan0075 | Production approval for a 40/50HP Chassis Die Casting Piston E.73376. | ||
| View original record | To SFT. c. to Hs. c. to HS/ID. X8040 BY/SS2/DB.9.12.25. Re 40/50HP Chassis - Piston. - Sec:5040. Further to memo BY/SS5/DB.7.12.25, issuing print of E.73376DC, please note that Mr Bailey will not… | ||
| scan0076 | The satisfactory testing of die-cast pistons to replace sand-cast pistons for the Phantom engine. | ||
| View original record | To EY. from Hs. c. to Sft. X8040 Hs5/LG11.12.25. DIE CAST PISTONS FOR PHANTOM ENGINE. We have tested several of these pistons on an engine on the test bench. If the engine is run up to high speeds, we… | ||
| scan0077 | Oiling tests conducted on the Phantom model. | ||
| View original record | R.R. 493 (40 H) (SL 42 12-7-23). J.H., D. X.8040 EXPERIMENTAL REPORT. COPIES TO: RC CJ WOR By E Da EP (all struck through) ROY RG Expl. No. 8980 (struck through) 8040 REF. Hs3/LG15;12.25 OBJECT OF… | ||
| scan0078 | Oil feed experiments for the Phantom and Silver Ghost models to address over-oiling. | ||
| View original record | R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF 316/ACL/LG151325 FURTHER EXPERIMENTS WITH 3 OIL FEEDS ON PHANTOM AND TESTS ON SILVER GHOST. Reviewing the question of… | ||
| scan0079 | With graphs showing oil consumption on the Silver Ghost model versus oil pressure and oil flow rates. | ||
| View original record | R. 498A (50 H) (D.D. 31, 12-8-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hw/ACL/LG151225 SKETCH 18 Graph 1: Title: OIL CONSUMPTION ON SILVER GHOST WITH VARIOUS OIL PRESSURES. RESULTS FROM ROAD… | ||
| scan0080 | Oil feed arrangements and their effect on oil leakage and consumption in main bearings. | ||
| View original record | R. 493A (50 H) (D.D. 31. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -3- Expl. No. REF : He/AOL/LC151225 Furthermore the results we have obtained from two cars on test, a Phantom and a Silver Ghost, show… | ||
| scan0081 | Oil discharge in a Phantom engine comparing intermediate bearings with and without grooves. | ||
| View original record | R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. REFHs/ACL/LG151225 Graph Title: OIL DISCHARGE ON PHANTOM WITH 3 MAIN OIL FEEDS. WITH & WITHOUT GROOVES IN THE INTERMEDIATE… | ||
| scan0082 | Summarizing the factors that control engine oil consumption. | ||
| View original record | R. 493A (50 H) (D.D. 31, 12-6-25) J.H.B. EXPERIMENTAL REPORT. -5- Expl. No. REF : HS/AOL/L6151 21 25 SUMMARY OF FACTORS CONTROLLING OIL CONSUMPTION AND THEIR RELATIVE IMPORTANCE. During our… | ||
| scan0083 | Reducing engine over-oiling through piston modifications and lubrication system design. | ||
| View original record | R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.L. EXPERIMENTAL REPORT. -6- Expl. No. REF: Hs/ACL/LG151225 a badly overoiling engine has been effected by the use of 'L' section rings. The unfortunate part is… | ||
| scan0084 | Endurance test of 'pedestal' type pistons for a Phantom engine, investigating fractures and 'piston knocks'. | ||
| View original record | To R. from Hs/ACL. c. to RG. E. c. to CJ. BJ. c. to DA. BY. c. to Wor. 28040 Hs/ACL1/LG1.4.26. EXPERIMENTS WITH "PEDESTAL" PISTONS FOR PHANTOM & RECENT INVESTIGATION OF "PISTON KNOCKS". +4190 We have… | ||
| scan0085 | Comparison between a standard pattern piston and a pedestal piston, discussing clearance, expansion and performance under load. | ||
| View original record | contd :- -2- knocks it seems to possess very similar characteristics to the standard pattern. It has been previously pointed out that the knock experienced is of a different nature to that obtained… | ||
| scan0086 | Comparison of mechanical efficiency and an investigation into piston knocks for pedestal pistons versus standard pistons. | ||
| View original record | contd :- -3- the average pedestal piston would give a slightly better mechan- ical efficiency than standard. At present we have only one comparison of the mechanical efficiency obtained with the… | ||
| scan0087 | Three experiments conducted to investigate and reduce engine knock. | ||
| View original record | contd :- -4- practically the same for each cylinder. Experiment 1. To explore the influence of the crankcase on the knock a thick rubber washer was placed between the cyl. blocks and the crankcase.… | ||
| scan0088 | Methods to eliminate engine knock by reinforcing the cylinder skirt with a steel sleeve. | ||
| View original record | contd :- -5- us that the cylinder block was a contributing factor and it was therefore thought advisable to direct our attention to this as a possible means of eliminating or mitigating the trouble. A… | ||
| scan0089 | Engine testing, focusing on cylinder skirt deflection and piston knocks. | ||
| View original record | contd :- -6- Diagm. 2 CYLINDER .175 .240 2.000 were more severe than with the previous block tested but apart from this, operation was silent when listening in the normal way. Consequently this method… | ||
| scan0090 | Piston design theory, piston knock, and the failure of pedestal pistons during endurance testing. | ||
| View original record | contd :- -7- "The piston ------ preserves a film of oil between it and the bore when in motion but when the direction is changed the film at any particular high spot may momentarily break down but is… | ||
| scan0091 | Piston knock issues and potential solutions involving cylinder skirts. | ||
| View original record | contd :- -8- The gudgeon pin fixing is more satisfactory than standard. The piston can be a good fit when cold and at the same time be quite free under high temperature conditions, due to greater… | ||
| scan0092 | Failure of a pedestal piston and proposing three ways to strengthen the design. | ||
| View original record | X. 8040 To R. from E. c. to BJ. Hs. By. E1/M22.4.26. RE. PEDESTAL PISTON. We think it is clear why the pedestal piston has broken away at the skirt. The piston is controlled in the cylinder by the… | ||
| scan0093 | Modifications to the Phantom chassis, including steering, ignition, and pistons. | ||
| View original record | X8040 To Hs. from R. c. to Wor. BY. c. to BJ. RG. R3/M18.5.26. RE PHANTOM CHASSIS. X.8770. X.8040. X.7770. X.8430. The Word "New Phantom" might now be simplified to "Phantom" only, "New" being… | ||
| scan0094 | Design and experimental testing of three new piston types. | ||
| View original record | Contd. -2- R3/M18.5.26. crown pistons which push the rings higher up and enable us to improve the general design and possibly that of the piston pin. The first one, Lec.2245, is like the present, but… | ||
| scan0095 | Different designs for Phantom engine pistons, with a requirement from Mr. Royce. | ||
| View original record | To BY. FROM E. C. to BJ. Hs. Y8040 E3/M19.5.26. PHANTOM PISTONS -X.8040. We send you herewith drawings LeCs .2237. 2243. and 2245., shewing respectively 2 bolt pedestal piston, single bolt pedestal… | ||
| scan0096 | Engine 7-EX's performance after 8,600 miles, focusing on issues with exhaust firing, self-ignition, and carbon build-up. | ||
| View original record | To Hs. from R. c. to BJ. Wor. c. to RG. CWB. c. to BY. PN. X8040 R6/M4. 6. 26. 7-EX - FIRING IN EXHAUST ETC. X. 8040 X. 8230 X 612 X. 699 X. 93 7-EX has run 8,600 miles mostly in France I think… | ||
| scan0097 | Use of magnesium casting and Y-metal for crankcases and pistons. | ||
| View original record | To RG. Nor. } FROM R. BY. } c. to BJ. Hs. X8040 R3/M5. 7. 26. X.4112 X.2603 X.8040 I was very impressed with the magnesium casting, which is apparently a very light alloy, and thinner than our… | ||
| scan0098 | Urgent need for magnesium copper and Y-alloy pistons, preferring cross-web designs over Zephyr types. | ||
| View original record | To RG. } FROM R. To Hs. } c. to Wor. BJ. BY. X8040 R4/M7.7.26. RE. AERO ENGINE PISTONS. X.4112 X.3852 X8040 X.3996 X. 2603 We must have magnesium copper and Y. alloy pistons quickly, assuming Y. alloy… | ||
| scan0099 | New spring ring device and other modifications for piston pins on various engines. | ||
| View original record | To RG. Hs. from R. c. to BJ. Wor. BY. X8040 R2/M28. 8. 26. RE: PISTON PINS. X. 8040 X. 2603 CONDOR, FALCON 10., PHANTOM AND GOSHAWK. X. 5040 X. 3996 We believe that all the pistons should be fitted… | ||
| scan0100 | Test report on the performance of pedestal pistons, detailing a 32-hour run and discussing issues with piston knock. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to BY. DA. Lecocq PEDESTAL PISTONS. X4190 We have completed 32 hrs. running with the latest pedestal pistons - LeC.2237 - in a test bench engine.… | ||
| scan0101 | Weight comparison between standard and pedestal pistons and a report on their operational testing. | ||
| View original record | contd :- -2- should be an advantage. The following is a comparison of the weights of the standard and pedestal pistons :- WEIGHT. Complete with Aluminium Gudgeon pin com- gudgeon pin piston plete… | ||
| scan0102 | Manufacturing methods for special light pistons for the Phantom model, weighing sand casting against forging. | ||
| View original record | To BY. from R. c. to BJ. Hs. X. 8040 R4/M3.9.26. RE. SPECIAL LIGHT PISTONS FOR PHANTOM. We should like these tried as sand castings, of the semi-pedestal type, provided the magnesium alloy already… | ||
| scan0103 | Modifications to a Phantom pedestal piston made from forged magnesium. | ||
| View original record | X8040 To EY. from R. c. to BJ. Hs. R3/M16.9.26. PHANTOM PEDESTAL PISTON IN FORGED MAGNESIUM. X. 8040. We send you herewith drawing LeC.2292. as promised in a previous memo. in which you will see we… | ||
| scan0104 | Confirming Mr. Royce's agreement to use nickel steel for bolts in a pedestal-type piston. | ||
| View original record | To BY/CGH. from E. c. to BJ. Hs. X8040 E1/M4.10.26. RE. DOUBLE BOLT PEDESTAL TYPE PISTON. X.3996 X.8040 Thank you for memo. BY/CGH4/H29.9.26, with chart. Mr. Royce is in agreement with using nickel… | ||
| scan0105 | Causes of gummed up piston rings, comparing issues found with aluminium versus cast iron pistons. | ||
| View original record | To R. from Hs. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. +8040 Hsl/LG6.10.26. GUMMED UP PISTON RINGS. X8040 X3996 We think it would be unwise for us to rely solely on the modification of the… | ||
| scan0106 | The causes of gummed-up piston rings, attributing it to gas leakage, and the development of an apparatus to measure it. | ||
| View original record | contd :- -2- We give some results obtained Jehle and Jardine in U.S.A. which show the method of conducting the tests and figures obtained. The quickest and most certain way we know of to produce… | ||
| scan0107 | Modifying an apparatus for engine leakage tests and referencing a 1926 report on piston temperatures. | ||
| View original record | contd :- -3- We are modifying the apparatus so that it can be applied to a standard engine with normal compression. We thought at first it might be difficult to measure the amount of leakage with… | ||
| scan0108 | Causes of gumming pistons, comparing different lubricating oils, and suggesting testing methods. | ||
| View original record | To Hs. from R. c. to BJ. Wor. X 8040 RE. GUMMING PISTONS. R2/M11.10.26. X.3996 X.858 X.1588 X.804o It is difficult to understand why pistons become gummed if it is not dependent on heat. At the same… | ||
| scan0109 | Diagrams and charts detailing piston temperature analysis and a comparison between aluminum and cast iron pistons. | ||
| View original record | PEENED OVER FIG. 2. METHOD OF FASTENING THERMOCOUPLES IN PLACE IN THE PISTON. ALUMINIUM PISTON No.1 No.3 No.4 CAST IRON PISTON No.1 ----o No.3 ----o No.4 ■ TEMPERATURE OF PISTON, DEG. FAHR.… | ||
| scan0110 | Tests for gas leakage past pistons and the apparatus devised to measure it. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. X9040 Hs/ACL1/LG12.10.26. TESTS ON GAS LEAKAGE PAST PISTONS. X858 At various times we have encountered troubles on our different engines… | ||
| scan0111 | Test report on engine air leakage measurement methods and results against varying RPM for a standard Phantom engine. | ||
| View original record | contd :- -2- Its/ACL1/LG 12.10.26 The amount of air used is measured by water replacement in a container having a calibrated gauge glass at the side. The action of the container is such that a small… | ||
| scan0112 | Engine leakage tests, noting variations and planning for improved testing methods. | ||
| View original record | contd :- -3- It will be seen that the leakage falls as the speed increases. Other variations we have noted is with a cold engine when at 500 r.p.m. the leakage was nearly one cu.inch per stroke. This… | ||
| scan0113 | Test report on the relative flexibility of pedestal pistons compared to the standard design. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. x8040 Hs/ACL2/LG12.10.26. PEDESTAL PISTONS. x7040 We have several sets of pedestal pistons in use on test engines and cars and have found… | ||
| scan0114 | Technical report on piston flexibility tests, including a blueprint diagram, a table of results, and analysis. | ||
| View original record | contd :- -2- BLUEPRINT DIAGRAM LABELS: CLOCK GAUGES 'V' PIECE PISTON 30 lbs WT. 2.50 TABLE: PISTON. | LOAD, LBS. | DEFLN: OF POINT 'A'. | FLEXIBILITY REL: TO STD: PISTONS. Present standard. | 30 |… | ||
| scan0115 | Piston leakage and proposing a change in testing methodology from various speeds to various pressures. | ||
| View original record | To Hs. from R. c. to BJ. RG. BY. X8040 R1/M14.10.26. RE, PISTON LEAKAGE. X.8040 X.858 I imagine that new pistons if well made are very gas tight until a certain pressure occurs on top of the piston,… | ||
| scan0116 | Tests to determine gas leakage past the pistons on a Phantom engine with various pressures. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. x8040 Hs/ACL2/LG9.11.26. GAS LEAKAGE PAST PISTONS ON PHANTOM. 4858 We have carried out some tests to determine the leakage which took place… | ||
| scan0117 | Piston ring leakage tests, noting issues with 'gumming' and equipment failure at high pressures. | ||
| View original record | contd :- -2- The results of two speeds are given - 500 and 1000 r.p.m. - and it is interesting to note how the leakage per stroke is considerably less at the higher speed which we think is due to the… | ||
| scan0118 | Graph showing 'New Phantom' piston leakage versus compression pressure at two different engine speeds. | ||
| View original record | "NEW PHANTOM" PISTON LEAKAGE. SKETCH No 39 ENGINE No R.E. 25. (No 5 Cyl) STANDARD "L" SECTION RINGS. JACKET TEMPERATURE. = 75°C. OIL TEMPERATURE = 60°C. LEAKAGE IN CU. INS PER STROKE AT ATMOSPHERIC… | ||
| scan0119 | Blueprint of an apparatus designed for measuring gas leakage past pistons. | ||
| View original record | [ "SKETCH XVII", "COMPN PRESS. GAUGE CONNECTED WITH OTHER PLUG HOLE", "NON RETURN VALVE IN SPARK PLUG HOLE", "RELEASE TAP", "CONSTANT LEVEL TANK", "INLET FOR WATER", "SMALL U TUBE FOR READING… | ||
| scan0120 | Test report on the effect of piston ring clearance on gumming in a standard Phantom engine. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to BY. x80240 Hs/ACL1/LG18.11.26. X1919 X741 X3996 GUMMING OF PISTON RINGS. We have made some tests on a standard Phantom engine to see what effect… | ||
| scan0121 | Tests on piston ring gumming and the effect of groove clearance. | ||
| View original record | Contd :- -2- Our tests indicate that there is less tendency to 'gum up' with large groove clearance than with small. A probable explanation is that liberal clearance allows sufficient movement of the… | ||
| scan0122 | Piston gumming experiments testing the influence of stiff versus weak piston rings on a Phantom engine. | ||
| View original record | to R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. X8040 Hs/ACL1/LG19.11.26. PISTON GUMMING EXPERIMENTS. X741 The influence of stiff and weak piston rings on the tendency to 'gum up' in the… | ||
| scan0123 | Page from a report detailing test conclusions on piston ring gumming tendency and oil passage. | ||
| View original record | contd :- -2- hard carbon found in the previous test. Therefore we may say that from these tests :- (1) The gumming tendency is less with rings having large groove clearance than those having small… | ||
| scan0124 | Cure for gummed pistons by increasing the piston ring wall pressure. | ||
| View original record | To Hs. from R. To BY. " " c. to BJ. RG. c. to Wor. EP. X8040 R4/M22.11.26. PHANTOM, GOSHAWK, CONDOR X.8040 X.2603 AND F.10 PISTON RINGS. X.3996 X.2103 It is understood that the cure for gummed pistons… | ||
| scan0125 | Piston materials for aero and car engines, including trials of magnesium on the Phantom. | ||
| View original record | To RG. Hs. E. from R. c. to BJ. Wor. PN. CWB. R3/M22.12.26. X.4004 X.3996 X.8040 PISTONS - AERO AND CAR. We had better stick to Y. metal for aero work. We now seem to have got these much better i.e.… | ||
| scan0126 | Outlining design points and recommendations for pistons in aero engines. | ||
| View original record | To E. RG. Hs. from R. c. to BJ. Wor. BY. F.10. PISTONS AND OTHER AERO ENGINES. X.3996 X.8040 X.4004 I should not be too keen to send out engines with very high compression. Tests should be higher than… | ||
| scan0127 | Issues with piston knocks, comparing different piston designs and outlining testing methods. | ||
| View original record | To R. from Hs/ACL. c. to BJ. Wor. c. to RG. E. c. to DA. BY. c. to OY. X8040 Hs/ACL1/LG23. 2. 27. PISTON KNOCKS. +4190 Since the adoption of the stiffer cyl. skirts trouble from piston knocks have… | ||
| scan0128 | Piston knock issues and the testing of horizontally slotted pistons as a potential solution. | ||
| View original record | contd :- --2-- and the knocks more severe, on a piston which did not 'bed' uniformly and was subject to local high spots. It seems to indicate that the audible knock was resulting from some of these… | ||
| scan0129 | Blueprint of a piston with an additional sawcut for a Phantom model. | ||
| View original record | A 1.500 1.175 CTRS. B SAWCUT .050 WIDE FOR ALL OTHER DIMENSIONS SEE DRAWING E.73376.D.C. PISTON WITH ADDITIONAL SAWCUT. (PHANTOM). SCALE 1/1. SECTION A.B. .250 DIA. 23.2.27 | ||
| scan0130 | The performance and weight comparison of magnesium pistons fitted to a Phantom car. | ||
| View original record | To R. from Hs. c. to BJ. Wor. c. to RG. E. c. to DA. BY. X8040 Hs4/LG25.2.27. MAGNESIUM PISTONS. X4117 We are running a Phantom car fitted with magnesium pedestal pistons which contain 4% of copper.… | ||
| scan0131 | Issues with Maxium pistons containing 10% copper, specifically their tendency to collapse and knock. | ||
| View original record | To BY. from Hs/Rm. x40740 RE. MAXIUM PISTONS - 10% COPPER. x4044 The first set of this type of piston were pedestal, split in the normal manner. We find that they collapse and therefore knock. We have… | ||
| scan0132 | Performance and potential modifications of Phantom pistons, recommending further experimentation. | ||
| View original record | To Hs. E. RG. from R. c. to BJ.Wor.N.L PHANTOM PISTONS - ADDITIONAL SAW NICK AND PEDESTAL TYPE. X.8040 X.3666 Car pistons seem to be going fairly well; the pedestal ones on 7-EX appear to me… | ||
| scan0133 | Piston design modifications for the Phantom engine to address knocking and improve performance. | ||
| View original record | To R. c. to BJ. Hs. RG. PHANTOM PISTONS. In reply to your enquiry re: proposal to introduce another slot in the std. piston, the modification appeared to me to be a safe one if the slot is not carried… | ||
| scan0134 | Technical discussion on the issue of piston ring gumming due to increased clearances in reground cylinders. | ||
| View original record | R. from E. to BJ. RG. Hs. BY. 18040 E1/M9.3.27. X.3996 X.2103 X.8040 X.2603 GUMMING UP OF PISTON RINGS. It is noticed in report Hs2/LG7.3.27., that reground aero cyls. up to .015" large may be used in… | ||
| scan0135 | Improvements for gummed pistons in aero and car engines. | ||
| View original record | To RG. from R. To E. To Hs. To EY. c. to BJ. Wor. 48040 R2/M10.3.27. AERO ENGINES, CAR ENGINES - GUMMED PISTONS. X.3996 X.8040 X.2103 X.3866 I am very pleased to hear that it is settled that the above… | ||
| scan0136 | Design of piston rings, including tapered, faked, and lapped rings, and their effect on oil consumption. | ||
| View original record | To Hs. from R. c. to BJ. RG. c. to BY. E. X8040 R5/M2. 5. 27. PISTON RINGS. X.2103 X.741 X.8040 X.3996 I understand that we are using on both car and aero engines, piston rings ground to a slight… | ||
| scan0137 | Failure of magnesium pedestal pistons and the need for a design alteration. | ||
| View original record | To R. from Hs/Rm. c. to BJ. Wor. c. to RG. E. c. to BY. DA. X8040 Hs/Rm4/LG18.5.27. PEDESTAL PISTONS - E.75540. X4112 We have recently been running a set of these pistons made of magnesium on a car.… | ||
| scan0138 | Investigation of inertia and temperature stresses in pedestal type pistons E.75540. | ||
| View original record | Hs/Tsnl/LG18.5.27. INVESTIGATION OF STRESS IN PEDESTAL TYPE PISTONS - E. 75540 (A) Inertia stresses. At 3000 r.p.m. the inertia force will produce a pull in the bolts E.75186 of 498 lbs., the weight… | ||
| scan0139 | Design instructions and issues related to gummed pistons and car work. | ||
| View original record | To RG. HS. c. to Wor. BY. E. X8040 R1/M23.5.27. GUMMED PISTONS - RR. Cs. & Ps. X.3996 X.741 AND CAR WORK. X.8040 X.2103 X2603 As before instructed let us make no pistons for any purpose, such as H.C.,… | ||
| scan0140 | Stress calculations and proposed modifications for pedestal pistons. | ||
| View original record | To Hs. from E. c. to BJ. BY. X 8040 E1/M1.6.27. PEDESTAL PISTONS. X.8040 X.3996 X.4004 We do not agree with your calculations giving the stress in the bolts of the pedestal piston. We think the… | ||
| scan0141 | Defect in Phantom cylinder block castings and proposing corrective actions to eliminate piston knock. | ||
| View original record | +8040 To BY. from R. Hs. c. to BJ. Wor. R1/M25.6.27. PHANTOM CYL. BLOCKS. X. 8030 X. 8040 OY. has pointed out a defect in our Phantom cyl. blocks casting. This has shewn itself very definitely in the… | ||
| scan0142 | Investigation into Phantom piston knocks caused by cylinder distortion, with proposed solutions. | ||
| View original record | F.C.S To Hs. from Mr. _____ RECEIVED JUL 11 1927 X8040 Mxl/T11.7.27. Phantom Piston Knocks. The result of our recent investigation of the above with regard to cylinder distortion is as follows:- We… | ||
| scan0143 | Establishing standard dimensions for pistons for the 20-HP engine, including two diagrams. | ||
| View original record | ROLLS-ROYCE (FRANCE) LIMITED (Reversed) Mx/T/11.7.27. Before definitely establishing the dimensions thus arrived at as standard, we would like say six sets of pistons to be produced to the following… | ||
| scan0144 | Short typed note regarding investigations into the issue of Phantom piston knocks. | ||
| View original record | Mr. From Wor. By. " Hs. " X80240 Wor6/T15-7-27. Phantom piston knocks. -------------------- I have read your note with considerable interest, and thank you all for your investigations. If you and BY.… | ||
| scan0145 | Discrepancy in blueprints for a modified cylinder head and piston for Blue Sports Chassis. | ||
| View original record | To BY. from E. c. to BJ. Hs. X8040 E1/M16.8.27. RE. BLUE SPORTS CHASSIS. X.8774 X.8050 X.8040 We thank you for blueprints received in response to our request for detail drgs. of the cyl. head and… | ||
| scan0146 | Operating temperatures of aluminium and cast iron pistons in petrol and diesel engines. | ||
| View original record | To Ps. from Hs/Rm. X8040 Hs/Rm6/LG6.9.27 PISTON TEMPERATURES. X8040 X1506 With reference to your note in connection with the above which I am sorry I have been unable to answer owing to my being away.… | ||
| scan0147 | Machining operations for a Sports Phantom piston made of 'Y' metal alloy. | ||
| View original record | To BY. from E. c. to BJ. Hs: X8090 E1/M4.10.27. SPORTS PHANTOM - PISTON IN 'Y' METAL ALLOY. X4004 We send herewith Lec. 2467 shewing the above drop forged piston. You will see on the drg. where we… | ||
| scan0148 | Test report on a Phantom engine investigating whether piston friction causes overrun vibrations. | ||
| View original record | X8040 Hs/Rm2/LG10.10.27. X7040 We have carried out a test on the Phantom in which the piston clearance was arranged to be .008" cold and holes were drilled in the skirt to reduce viscous oil friction.… | ||
| scan0149 | Urgent memo requesting the modification of cases and pistons, and the production of new parts from sketches. | ||
| View original record | To RHC. from Hs/Rm. X8090 Hs/Rm3/LG15.10.27. Will you please modify the attached two cases 6 and/pistons to the appended sketches. Also make 6 off sketch B. and 12 off sketch A. This matter is urgent.… | ||
| scan0150 | Modified design for a Sports Phantom Piston, referencing drawing LeC.2476. | ||
| View original record | X8040 BY. from E. c. to BJ. Hs. E1/M1 8.10.27. SPORTS PHANTOM PISTON. We send you herewith drg.LeC.2476., shewing the above modified to suit existing crankchamber and cyl. dimensions. The design has… | ||
| scan0151 | Instructing the fitting of plain rectangular piston rings to Phantom chassis engines with honed cylinders. | ||
| View original record | [Stamped and crossed out: Sft.] [Stamped and crossed out: Mr.] c. Hs. Y8040 BY14/G.21.10.27. PHANTOM PISTON. ---------------- Further to my memo BY6/H.22.9.27. in which I instructed 12 sets of piston… | ||
| scan0152 | Test results for car 14-EX fitted with 1400 lbs rear springs and modified hydraulic dampers. | ||
| View original record | X8040 Hs/Rm5/LG7.11.27. 14-EX CAR. X235 X8410 This car was tested fitted with 1400 lbs. rear springs and hydraulic dampers with 60 lbs. up and down fixed loading and a viscosity factor rising to 250… | ||
| scan0153 | Issues with 'Y' metal pistons and potential new designs for Phantom and Sports Cars. | ||
| View original record | Hs. BY. RG. } FROM R. X8040 R2/M23.11.27. c. to BJ. Wor. E. PISTONS - PHANTOM 10,000 MILES, AND SPORTS CARS. X. 8040 X. 4004 X. 8940b (1) The 'Y' metal pistons which have turned out too flexible I… | ||
| scan0154 | Drawings for 'Y' metal pistons for models EAC.10 and 14. | ||
| View original record | BY. from E. c. to BJ. Hs. X 8040 E1/M28.11.27. EAC.10 & 14 - 'Y' METAL PISTONS. X.4004 X.8040 X.7040 We send you herewith drgs. LeCs.2490 and 2492 dealing with 'Y' metal pistons for EAC.10 and 14. E. | ||
| scan0155 | Stiffener for piston LeC.2476 to address flexibility and rattling, with a discussion on material choice. | ||
| View original record | BY. from E. c. to BJ. Hs. X. 8040 E2/M28.11.27. STIFFENER FOR PISTON LeC.2476 We send herewith LeC.2493 shewing the above. This stiffener should enable you to alter the set of pistons made to LeC.2476… | ||
| scan0156 | EAC.10 & 14 die-cast type pistons for production and sporting editions of the Phantom. | ||
| View original record | BY: from E. c. to BJ. Hs. 48040 E1/M29.11.27. EAC.10 & 14 DIE CAST X. 7040 TYPE PISTONS. X. 8040 X. 4004 Herewith we send LeC.2494 shewing the above. This piston is intended for the production chassis… | ||
| scan0157 | New cast aluminium piston design with 'H' webs as an alternative to a previous design. | ||
| View original record | X. 8040 E2/M30.11.27. BY. from E. c. to BJ. Hs. EAC.14 - CAST ALUM: PISTON WITH 'H' WEBS. Herewith we send drg. LeC.2495 shewing the above. This piston has been created as an alternative to LeC.2434 -… | ||
| scan0158 | Technical memo discussing the lubrication of the piston pin and suggesting modifications for experimental sets. | ||
| View original record | To BY. from E. c. to BJ. Hs. X 8040 E1/M9.12.27. LeC. 2494 - PISTON. X. 8040 X. 7040 In reply to your memo. BY8/G7.12.27. the method of lubrication of the piston pin is that oil is supplied by the… | ||
| scan0159 | Modifications to the cross web piston design and lubrication system. | ||
| View original record | BY. from E. c. to BJ. Hs. X8040 E1/M13.12.27. EAC.10 & 14 CROSS WEB PISTON. X.8040 X.7040 Referring to drg.LeC.2494, Mr. Royce fears to start off with the webs as heavy as shewn, as he says it will… | ||
| scan0160 | Prints of piston parts and instructions for their modification for Sports' Chassis. | ||
| View original record | c. to Hs. +8040 BY/CS1/DB.16.12.27. Re EAC.14 - Piston - Sec:5040. Please receive herewith prints of each of the following drawings, detailed from LeC.2490/2:- E.76933 - Lock Washer. E.76934 -… | ||
| scan0161 | Comparing 'Y' alloy with a proposed 'T50' alloy for use in forged aluminium pistons. | ||
| View original record | BY. from HL. c. BJ. R. c. to Wor. Hs. c. to RG. Laboratory. HL2/EJW19.12.27. RR. FORGED ALUMINIUM ALLOY PISTONS. X.4004 X.3996 X2748 X.8040 The 'Y' alloy pistons which have been tried out are not… | ||
| scan0162 | Testing of die-cast car pistons in Halls alloy for 20 HP and 40/50 models. | ||
| View original record | X8040 x5040 To BY. from Hs/Rm. c. to RHC. Hs/Rm3/LG1.2.28. With reference to the car pistons to be made in Halls alloy. We would like to try a set of both the 20 HP. and 40/50 pistons die-cast in this… | ||
| scan0163 | Production of 40/50 HP Sports Type chassis pistons as die castings and questioning the need for 20 HP pistons. | ||
| View original record | Hs. C. RHC. X8040 BY/Cgh5/G.3.2.28. CHASSIS PISTONS. With reference to Hs/Rm3/LG.1.2.28. we have instructed a set of 40/50 HP. Sports Type Chassis pistons to be produced as die castings in Hall's… | ||
| scan0164 | Mechanical test results for T50 alloy forgings and casts, comparing them to 'Y' alloy and Duralumin. | ||
| View original record | X8090 R. By.Rg. H16/EA3.2.28. Laboratory. ---------------- ------------------- ----------------- Hs. Wor. ------------- Re T50 Alloy. -------------- In connection with the forgings, for pistons, made… | ||
| scan0165 | Laboratory report discussing die-cast piston materials and urging tests on new types of valve steel. | ||
| View original record | HL. BY. Hs. from R. c. to BJ. Wor. 48040 R2/M6. 2. 28. LABORATORY REPORT. X.4004 X.8040 X.3616 X.4537 I quite agree with pushing forward die cast piston in our T.50 alloy. In car work we cannot afford… | ||
| scan0166 | The metallurgical properties of experimental T50 alloy pistons compared to 'Y' alloy, with a note on 'Condor' valve failure. | ||
| View original record | X8040 R. BY. Hs. c to BJ. c to Wor. H13/EAll.2.28. Laboratory. Re Yours R2/M6.2.28. A set of experimental car pistons has now been cast in the light, high yield point, T50 alloy. A comparison between… | ||
| scan0167 | Comparing cross web and diagonal web piston designs, concluding the diagonal web is the superior design for car work. | ||
| View original record | R. from E. c. to BJ. Hs. .BY. X8040 E1/M18.2.28. PISTONS. X.8040 X.7040 It is understood that we are testing pistons of both cross web and our old diagonal web pattern. The cross web are however found… | ||
| scan0168 | Directive to change the material for piston pins from casehardened steel to a high-duty alloy steel. | ||
| View original record | E. Hs. BY. OY. RG. from R. c. to BJ. Wor. EP. Fl. X8040 R2/M15.3.28: AERO ENGINES, 20 HP, & 50 HP. CHASSIS PISTON PINS. X. 8040 X. 3996 X. 7040 X. 685 X. 5040 It should be realised that we already… | ||
| scan0169 | Proposal to change the material for gudgeon pins and the associated concerns regarding wear and hardness. | ||
| View original record | Hs. C Way 48040? BY8/G.21.3.28. MATERIAL FOR GUDGEON PINS. In view of R2/M.15.3.28. and to empower me to put R's proposal into force, would you kindly issue a standardisation sheet for both chassis,… | ||
| scan0170 | The benefits of reducing lubricating grooves in aero and car engines. | ||
| View original record | E. RG. Hs. BY. from R. +8040. R3/M23. 3. 28. AERO AND CAR ENGINES. X.2176 LUBRICATING GROOVES. X.8040 X.3996. Now we know that engines can run better with much less oil grooves. Will all concerned see… | ||
| scan0171 | Material composition of piston pins and recommending further fatigue testing. | ||
| View original record | E. RG. Hs. BY. HL. from R. c. to BJ. Wor. Fl. R7/M7.4.28. ALL ENGINES - AERO & CAR - PISTON PINS. X. 5040 X. 8040 X. 7040 X. 3996 I understand that we are making no case-hardened pins but that they… | ||
| scan0172 | Drawing for single bolt pedestal pistons with lower scraper rings for the Phantom and EAC.10. | ||
| View original record | BY. from E. c. to BJ. Hs. f8040. E1/M2.5.28. PHANTOM AND EAC.10. SINGLE BOLT PEDESTAL PISTONS WITH LOWER SCRAPER RING. X. 8040 X. 7040 Please find attached drg. LeC.2554 shewing the above. . E. | ||
| scan0173 | Heat treatment and hardness testing of various pistons. | ||
| View original record | X8040 c. Hs. BY8/G.11.5.28. PISTONS. --------- In connection with the question of heat treating pistons, the question naturally arises as to whether the figures obtained by the ageing treatment (or… | ||
| scan0174 | Two compression ratios for the 40/50 engine and general chassis improvements. | ||
| View original record | X8040? SECRET. R3/M29.5.29. Hm. from R. C. to Sg. Hs. Wor. E. 40/50 - TWO COMPRESSION RATIOS X790 X8040. I appreciate your memo. HmS/W27.5.29. The trouble with two compression ratios as standard is… | ||
| scan0175 | Piston gudgeon pin distortion and proposing a series of tests to resolve it. | ||
| View original record | X8040 To RHC. from Hs/Rm. Hs/Rm2/LG31. 5. 28. PISTONS. X8040 X685 We attach a note from MX. on Pistons in which you will see that at the moment they are not having so much trouble with the bedding of… | ||
| scan0176 | Telegram from Royce regarding a dangerous piston design, suggesting it be scrapped and replaced with a strengthened version. | ||
| View original record | X8040 To BY. from Hs. c. to Wor. Hsl/LG17.7.28. X5040 from R. :- We give below a copy of a telegram we have received "HIVES - TWENTY PISTON ASSUMING BREAK AS PHANTOM CONSIDER "PRESENT DANGEROUS SCRAP… | ||
| scan0177 | Issue of piston knocks in engines, particularly when starting from cold. | ||
| View original record | To Na. from Hs. X8040 Y3666 Hs2/LG19.7.28. PISTON KNOCKS. X8040 With reference to the attached note from Springfield in connection with the above. We cannot say from our experience with the Phantom… | ||
| scan0178 | Inquiry to The Automotive Engineering Co. Ltd. about the weight of BHB pistons for a 40/50 HP car. | ||
| View original record | X8040 X1506 Hs/Rn4/LG. Expl: Dept: 16th. Oct. 1928. Messrs. The Automotive Engineering Co.Ltd., 104, The Green, Twickenham. Dear Sirs, For the attention of H.S.Hewitt Esq., RE. BHB. PISTONS. With… | ||
| scan0179 | Piston design, focusing on ring type, quantity, and manufacturing for various chassis. | ||
| View original record | Hs. from R. c. to BJ. Wor. By. 48040 R5/M18.10.28. RE. PISTONS. X.8040 X.5040 X.7040 X.741 We conclude that you do not want a lower scraper ring. We agree we only put it on to reduce the over-oiling… | ||
| scan0180 | Piston specifications and design modifications for Phantom and 20 HP models. | ||
| View original record | contd :- -2- of the pistons we wish to get adopted :- We want 3 narrow rings and a perfect circle ring all pinned as shewn on Lec.2490 for both chassis. We understand you are following Lec.2577 type… | ||
| scan0181 | Cross-section drawing of a piston and connecting rod assembly with dimensional annotations. | ||
| View original record | 2.75" approx varies with compression ratio. 4.250 | ||
| scan0182 | Proposal to have the top of the piston eccentric with the skirt to keep the piston head axial with the cylinder centre line. | ||
| View original record | E c. Hs. X8040 BY5/G.19.10.28. PISTONS. RE.R'S PROPOSAL TO HAVE TOP OF PISTON ECCENTRIC WITH SKIRT. -------------------------------------------------------- In the above suggestion it is evident that… | ||
| scan0183 | Layout drawing for Phantom chassis pistons, seeking approval before proceeding with detailed drawings. | ||
| View original record | +8040 E. c. BJ. c. Wor. c. Hs. BY5/G.29.10.28. re CHASSIS PISTONS. ----------------- We send you herewith print of Scheme 1086 of the layout drawing which we have made showing the Phantom piston in… | ||
| scan0184 | Pistons seizing up in new 40/50 HP and 20-HP cars. | ||
| View original record | Hs. c. BY. c. Wer. c. Mx. X6040 EP9/H24.1.29. re. 40/50 HP. and 20-HP. Pistons seizing up on new Cars. We are experiencing this trouble with new cars which are being delivered to customers, also new… | ||
| scan0185 | Pistons seizing on new cars and the need to establish a routine test. | ||
| View original record | Hs. c. BY. [crossed out] c. Wor. [crossed out] c. Mx. [crossed out] X8040 EP7/H25.1.29. re. Pistons seizing on New Cars. With reference to your Hs1/LG25.1.29., we do not want to feel that any recent… | ||
| scan0186 | Problem of seized pistons on new 40/50 HP and 20 HP cars. | ||
| View original record | To E.P. from Hs. c. to B.Y. Wor. c. to MX. Y8040 Hal/LG25.1.29. 40/50 AND 20 HP. PISTONS SEIZING ON NEW CARS. X8040 Y5040 A short time ago we sent a note to the Repair Dept. to ask them whether they… | ||
| scan0187 | Technical memo discussing seized pistons in New Phantom engines and proposing a modification to the starter carburetter. | ||
| View original record | C O P Y N-W. Technical - re New Phantom Pistons. With reference to the above, we have received two cars this week, viz. 91-CL (Lord Ebury) and 7-WR (Withers) which have only run a very short mileage… | ||
| scan0188 | Cover memorandum clarifying that the company is not working to finer limits on piston clearances, contrary to a recent suggestion. | ||
| View original record | Hs. from Mx. X8040 Mx9/T7.2.29. I think you will be interested in the attached copy of memo from Br. I have replied to it and disillusioned him with regard to his suggestion that we are working to… | ||
| scan0189 | Phantom piston seizures due to over-priming and the proposal to circulate a warning leaflet to owners. | ||
| View original record | S/W(H) X80240 S/H (BY)..... from H. (C. being on holiday). H3/LH/14.6.29 Copies to Wor. Hs. EP. RE: PHANTOM PISTON SEIZURES, OVER-PRIMING. Re EP6/H25.5.29. I have had a few words with O. on EP's memo… | ||
| scan0190 | Piston seizure and over-priming issues in Phantom cars, and the attachment of a new label. | ||
| View original record | BY. c. Wor. c. Hs. c. H. X8040 EP/Thn5/H17.6.29. re. PHANTOM PISTON SEIZURE, OVER-PRIMING. With reference to H's memo. reference H3/LH.14.6.29. we are attaching for your information, copy of a label… | ||
| scan0191 | Instructions and warnings for the use of the starter carburetter for cold engine starts. | ||
| View original record | This carburetter is provided for starting Engine from cold only. It is correctly set when leaving the Works & should not be readjusted. (When engine is warm it should start without use of starter… | ||
| scan0192 | Whether to issue a pamphlet regarding Phantom piston seizures. | ||
| View original record | W/S (H) c. Wor. c. Hs. c. Ef. X8040 BY/Cgh4/G.18.6.29. re PHANTOM PISTON SEIZURES. ------------------------- With reference to H3/LH.14.6.29. on looking further into the matter, we do not see why we… | ||
| scan0193 | Proposed trial of a new strutted piston design, referencing Chevrolet's success with a similar type. | ||
| View original record | OY-1 x8040. August 28, 1929. TO: Mr. Beaver. cc Mr. Ross. Mr. Bagnall Mr. Burton Experimental Dept. Mr. Hives (England) FROM: Mr. Olley. PISTON - SECTION 5040. Mr. Casserly wondered at our still using… | ||