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).
The method for adjusting the E.A.C. Carburetter.
| Identifier | ExFiles\Box 66a\1\ scan0038 | |
| Date | 29th January 1925 | |
| R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. S E C R E T. Expl. No. REF: He/EAC/L/P29.1.25 E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. ADJUSTMENT OF CARBURETTER. The following are some notes on the method of adjusting the EAC. Carburetter. The final adjustment should be made with the car on the dynamometer because the carburetter will then be operating under similar conditions of temperature of fuel and air to when it is on the road. Nevertheless, these notes apply equally as well to carburetter adjustment when the engine is on the test bench. As air and fuel temperature have considerable influence upon carburation, it is essential for correct adjustment that the engine is at its normal running temperature and the jacket water at approximately 80°C. It is assumed that the carburetter has been built up and tested according to the previous instructions. It is very important that the air piston works quite freely in the suction chamber and that it has the specified clearance. A carburetter cannot function satisfactorily with a badly working air valve. Another important point is the air valve spring, and as stated before, it should just allow the suction chamber cover to rest on the suction chamber and by slightly raising the valve, the cover should lift with the spring As an initial setting of the low speed jet, unscrew until it is free (clockwise) i.e. the jet valve completely shuts off the low speed jet. Then turn (anticlockwise) until the jet contd :- | ||