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).
Letter from Maurice Olley regarding misfiring issues caused by the vacuum tank and the results of tests on different pipe arrangements.
Identifier | ExFiles\Box 77\4\ scan0036 | |
Date | 27th September 1927 | |
X5883? ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. OY4R.92727 September 27th, 1927. Mr. E.W. Hives, Rolls Royce Ltd., Derby, England. Dear Mr. Hives: Re: Vacuum Tank and Misfiring. The following note on Vacuum Tank and Misfiring should be interesting, also refer to my note Fuel Feed, OY4.R.92227. "At Chassis 2001 it is proposed to connect the suction pipe from the vacuum tank to the centre of the induction pipe, attaching it to the pilot jet base, in an endeavour to reduce the mis-firing period which occurs whenever "dumping" takes place. Chassis 252 RM{William Robotham - Chief Engineer} misfired badly for 100 feet whenever "dumping" occurred, the "dumping" taking place regularly every 500 ft. The installation of the new pipe arrangement entirely cured the misfiring and it was possible to drive the chassis at 6-7 miles per hour for four hours. It was also driven at 3-4 miles per hour for one mile. The only effect on the slow speed running of the action of the vacuum tank, was to very slightly reduce the speed of the engine for a few seconds. We have not been able to detect any difference in the operation of the engine at slow speed or in fact any speed, whether using: (a) Suction pipe connected to the rear of throttle chamber (b) Suction pipe connected to the pilot jet base. In conclusion, the improvement in the slow running is so great, that I do not think we should hesitate in making arrangements to equip every phantom with either of these schemes." Very truly yours, Maurice Olley | ||