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).
Comparative performance tests of different diameter induction pipes on Bentley cars.
| Identifier | ExFiles\Box 85\4\ scan0089 | |
| Date | 8th October 1934 | |
| TO Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}5/KW.8.10.34. Comparative Tests between Standard Induction Pipe 1.5" dia. and new Induction Pipe 1.375" dia. Comparisons have been taken on two Bentleys, 3-B-IV and B-23-AE, for performance in acceleration and hill climbing with the present induction pipe 1.5" dia. and standard S.U. carburetter against a new induction pipe 1.375" dia. fitted with standard carburetter. From the tables given it will be seen that the smaller pipe shows a marked improvement, especially on hills. In the acceleration tests the gain should not be judged so much in seconds as the improved feel of the engine. The new induction pipe helps us over the flat spot feeling now predominant about 30 M.P.H. Hs{Lord Ernest Hives - Chair}/F.Dodd. | ||