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).
List of conclusions regarding engine induction system losses and efficiency.
| Identifier | ExFiles\Box 85\4\ scan0180 | |
| Date | 6th August 1937 guessed | |
| 4 The following conclusions. ① Losses due to the induction system & carburetters will be about 20 BHP. ② Losses due to port restrictions are about 15 BHP. ③ The large bore induction system (1 7/8") is almost as efficient at high speeds as the ultra clear system of six 1 3/8" S.U. carburetters bolted straight to the ports. There is a fairly substantial loss at middle speeds, however, but it is suspected that this could be evened out by a slightly longer inlet duration & slightly advanced phase angle. The above has, whilst being quite interesting in showing what could be done. | ||