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).
Tests investigating engine hesitation and high-speed fuel starvation due to petrol temperature.
| Identifier | ExFiles\Box 149\4\ scan0303 | |
| Date | 31th May 1937 | |
| -2- This is shown to be due to the temperature of the pump and pipe to it and the temperature of the petrol in the tank. Removing the filter and pipe from the V in the engine did not cause a noticeable improvement in the hesitation time. On another occasion after a stop of 3 mins. at a level X the car would not exceed 40 M.P.H. for over 2 mins. AIR 20°C. U.B. 52/56 TANK. 40°C. To effect an improvement the feed pipe from the tank was taken outside the frame from the rear shackle when it was only possible to obtain starvation as below. AIR 17 52/55 PIPE 32/32 TANK. 36°C 30 seconds. 16 48/53 34/33 44°C. 45 seconds. In this case the air temp. was low and more benefit obtained with the pipe outside than would be with a higher air temperature. It was never possible to obtain the conditions of temperature when the pumps would not recover and bring the car to a complete standstill. With the double pump alone or all three together made no difference in the time of starvation. High Speed starvation. With the double or all three pumps the speed was only limited on a few occasions the effect of temperature being more easily observed when only a single unit was used. | ||