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 testing of various Bentley piston types.
| Identifier | ExFiles\Box 86\2\ scan0067 | |
| Date | 23th September 1933 | |
| X23/6 To E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} C. HOT. C. Hy.{Tom Haldenby - Plant Engineer} C. Mt. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}R/KY.23.9.33. BENTLEY PISTONS. With reference to E.R/HP.15.9.33. Our original experience with aluminium pistons of 3.000" bore or over leads us to believe that we shall never get away with an unsplit skirt, and freedom from piston knock when cold, unless we provide some other source of flexibility. We have had the piston to Lcc.3493 with the semi-split on test, but naturally any new type requires a tremendous amount of running before we can say it is satisfactory. We consider this design promising. At the present moment it would appear that we shall succeed with the normal split skirt type Lcc.3447 providing we utilise the minimum clearance on the ring land and the improved alloy. We are looking forward to a piston on the lines of Lcc.3493 when we step up our power outputs still further. HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||