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).
Summary of conclusions from tests on engine port streamlining and inlet valve modifications on a Bentley engine.
Identifier | ExFiles\Box 31\2\ Scan141 | |
Date | 6th December 1933 guessed | |
-2- CONCLUSIONS FROM TESTS. (1) Improvement of streamlining of port etc. as tried gives a very slight increase in flow - this would probably not be detected on an engine (see attached curve). (2) Removal of the turbulent portion around the inlet valve, at any rate on the 7.5 c.r. head to EB.1237, gives a definite improvement (see attached curve). SUMMARY. No really satisfactory explanation of the improved flows obtained with models in wood has been found. From attached curves it is estimated that a head to EB.1237 modified to have the turbulent portion of combustion chamber around inlet valve removed, and the port streamlined and polished would give approx. 3-4 BHP. increase in power on the Bentley engine compared with the standard head both at the same ratio. Hs{Lord Ernest Hives - Chair}/Std. | ||