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).
Tests on petrol consumption for the 40/50 chassis, including road tests and mixture adjustments.
| Identifier | Morton\M22\ img134 | |
| Date | 28th October 1920 | |
| Handwritten top: Hs{Lord Ernest Hives - Chair}, ON 6 EX RETURNS 28 MPG FROM DERBY TO WW (180 MILES, AT 28 MPH AVERAGE SPEED OPEN CAR 2 1/2 TONS AUW.). WHERE THE PETROL ACTUALLY GOES. RET Typed routing list: To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to Bn.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to EP.{G. Eric Platford - Chief Quality Engineer} c. to PN.{Mr Northey} c. to C. c. to EWT. for R.R. Inc. c. to H.{Arthur M. Hanbury - Head Complaints} Handwritten reference/date: Hs{Lord Ernest Hives - Chair}2/LG 30.9.20 Hs{Lord Ernest Hives - Chair}1/LG28.10.20 Typed document body: X.3056. RE PETROL CONSUMPTION ON 40/50 CHASSIS. In our memo. Hs{Lord Ernest Hives - Chair}2/LG30.9.20. we pointed out that it was possible to obtain very remarkable consumptions on our present 40/50 chassis. We have since, on a run from Derby to West WitteringHenry Royce's home town, averaged 28 M.P.G. with an open-touring car weighing complete 2 1/2 tons, at an average speed of 25 M.P.H. over 180 mls. We have lately carried out a number of tests on 6.EX Car to find how the petrol is used. The car was run with thin oil throughout the transmission - castrol oil in the engine. These tests were carried out under the same road conditions i.e., over a level piece of tar macadam road - dry condition. We first carried out a number of tests to find the most economical position of mixture and ignition. We found it was not economical to run with a starving or very weak mixture. We obtained the best consumption when the mixture was adjusted to give full power at a particular throttle opening; we found this by setting the throttle in a certain position. We then adjusted the mixture so that we obtained the maximum speed - if we made it weak so Contd. | ||