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).
List of general tests carried out regarding explosions in the silencer.
| Identifier | WestWitteringFiles\P\October1926-November1926\ Scan035 | |
| Date | 7th October 1926 guessed | |
| -6- Contd. We give below a list of more general tests which have been carried out with regard to explosions in the silencer :- (1) A leak was made in the induction pipe and compensated for by strengthening up the low speed jet, explosions obtained were more numerous and violent than under standard conditions. (2) Leak as above tried in various parts of the induction system; wherever the leak may be the results are always the same as in (1); the larger the leak the more violent the explosions. (3) Three exhaust valves set open by reducing tappet clearances; no effect. (4) All tappets set with sufficient clearance to do away with valve overlap; no effect. (5) High speed jet closed up; no effect. (6) Petrol turned off before coasting downhill; no explosions. (7) Baffles fitted in all inlet ports and at the joint of the carburetter to hot spot bend, to prevent any petrol being sucked up the walls of the induction system; this had no effect. (8) Doris scheme done away with; no effect. At the present time the conditions to be complied with to reduce explosions to a minimum, as shewn by our tests are :- Contd. | ||