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).
Engine detonation tests involving varied carburetter air temperatures and news of a new cylinder head for the Phantom.
| Identifier | ExFiles\Box 1\3\ B001_X 93-page48 | |
| Date | 11th May 1926 guessed | |
| contd :- -4- there has been any appreciable downward movement of the pistons. During the tests we tried the effect of different air temperatures to the carburetters. The temperature was varied from 26ºC to 86ºC. Although there was a definite drop in power for the high temperature, we could not appreciate that there was any increase in detonation! On the road the worst condition for detonation is when the throttle is full open at low speed. Usually when this occurs the car has been luffed up with the throttle shut so that there should not be any question of any local over-heated spots in the combustion chamber or excessive hot spot heat. Since writing out this report we have received a wire from R.{Sir Henry Royce} instructing a new cylinder head for the Phantom. We feel confident that this will definitely improve the engine! Hs{Lord Ernest Hives - Chair}/A.C.Lovesey! | ||