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).
Diagnosing the cause of a sticking accelerator pedal on car 11-EX, which was a tight exhaust butterfly valve.
| Identifier | ExFiles\Box 68\1\ scan0318 | |
| Date | 2nd September 1926 | |
| 48470 PN{Mr Northey}3/DN2.9.26. TO Hs.{Lord Ernest Hives - Chair} c. to BJ, H, CWB & Br.{T. E. Bellringer - Repair Manager} FROM P.N. Your Hs{Lord Ernest Hives - Chair}3/LG1.9.26. It was found with 11-EX that the sticking accelerator-pedal, which of course is quite equivalent to a sticking throttle, arose from the fact that the exhaust butterfly valve when hot, tended to become jammed in the closed position owing to its becoming too tight a fit. After this valve was eased, the trouble disappeared. Obviously, as long as it is found that the accelerator-pedal has stuck, the driver is unaware whether the cause may be due to either one or the other of these two valves sticking. In either case the sticking may be so considerable that, as in the case of 11-EX, the levers become bent and have to be corrected. P.N. | ||