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).
Conditions under which explosions occur in the silencer of a Phantom chassis.
| Identifier | ExFiles\Box 1\3\ B001_X 93-page74 | |
| Date | 7th October 1926 | |
| Hs{Lord Ernest Hives - Chair}/AJLl/T7.10.26. EXPLOSIONS IN SILENCER (PHANTOM) We have carried out a series of tests on the above fault which is present in some degree on all Phantom chassis, with the following results. Conditions under which explosions occur. Explosions take place when the engine is being driven by the car (i.e. when coasting) (a) With throttle fully closed. (b) With the governor lever set in a slow running position. (c) With throttle slightly open due to the driver not removing his foot from the accelerator pedal, due to faulty adjustment of controls or weakened throttle closing springs, etc. --- (a) Explosions which occur when the throttle is definitely closed are negligible, given a sound induction system. If the throttle is definitely closed the only explosions which can occur are controlled by the slight amount of petrol remaining in the induction system after the throttle has been closed. This is very slight and even with an air leak in the induction system only two or three explosions occur at the most, before the petrol is used up. If there is no leak in the induction system, explosions under this condition are practically unknown under road conditions. Given a good fitting, definitely closing throttle and a sound induction system, explosions are negligible under this condition. Contd. | ||