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).
Electrical and road test results on a Vauxhall engine.
| Identifier | ExFiles\Box 147\5\ scan0136 | |
| Date | 8th July 1937 | |
| -7- Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}11/R.8.7.37. Example of test on Vauxhall Engine. "It was found when using the side electrode plug in conjunction with a Lucas coil that the voltage was 8 kilo-volts with plug gaps of .018 at 600 R.P.M. and 13 kilo-volts with plug gaps of .032"." Later: from results on a Vauxhall engine. The results of the experiments show that missing a part throttle between 10-30 M.P.H. on level road is materially affected by:- (a) The type of plug used (side or end electrode). (b) The type of H.T. coil used. (c) The amount of suction advance. Note. The graphs submitted with this report show kilo-volts against R.P.M. running light (no load). Road Testing. All road tests on petrol consumption are carried out with what they call the 5th wheel in operation. This is a normal cycle wheel which is suitably clamped to the running board driving a trip gauge in conjunction with a model 44 Weston magneto and Weston D.C. Voltmeter (Model 1) which is claimed to be accurate to 1/4 of 1%. It can be appreciated that accuracy should be essential for road consumption figures when it is realised that the percentage differences which we are looking for can be accounted for in the variation of normal stock speedometers. For measurement of the fuel used, the "Zenith mileage tester" (12 volts) 1/10 Imp. gallon. Other information supplied by Vauxhall's relative to our test bed work at present. | ||