From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design and development of a Bentley piston.
| Identifier | ExFiles\Box 86\2\ scan0041 | |
| Date | 24th August 1933 | |
| X236. P.B.39 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from E.{Mr Elliott - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} Mx.{John H Maddocks - Chief Proving Officer} E.1/HP.24.8.33. Bentley Piston. Replying to your memo Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/MA.22.8.33, we have received only one sample piston with this memo. With regard to the dimensions of the ring lands above the skirt, we were unaware that any alteration had been made, and we should not have agreed to any reduction in the diameter of the land above the scraper ring as we know that this land has always come into play as a bearing surface at high speed, and prevented the top of the spring skirt from being overloaded. We are of the opinion that the design of piston we are using today will never be satisfactory for high speed operation, and we think that every effort should be used to develop a piston for the Bentley in which the side load is definitely carried at both ends by some non sprung portion of the piston. One attempt in this direction is shewn on LeC.3493 in which the piston is split in a different manner utilizing the present casting. We think we might also try this same piston without the bottom horizontal slot. Piston LeC.3493 definitely requires the cylinder with the longer barrel to LeC.3475. E.{Mr Elliott - Chief Engineer} | ||