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).
Petrol consumption for the 40/50 chassis, detailing modifications to achieve 35-37 MPG.
| Identifier | Morton\M22\ img124 | |
| Date | 30th September 1920 | |
| HS{Lord Ernest Hives - Chair}, ON HOW TO GET 35MPG FROM A SILVER GHOST. REF Hs{Lord Ernest Hives - Chair} 1/LG 28.10.20 (6EX) 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 Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} 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} Hs{Lord Ernest Hives - Chair}2/LG30.9.20. X.3056. RE PETROL CONSUMPTIONS ON 40/50 CHASSIS. We think it may not be generally known what remarkable petrol consumptions we can obtain on a present standard 40/50 chassis if we go out to obtain the maximum miles on a gallon of petrol irrespective of other points. We have, on 6.EX Car, run 35 to 37 miles on a gallon of petrol. The average speed worked out at 25 M.P.H. With the present price of petrol and the prospect of it still increasing in price, it might be thought worth while to make a demonstration of the miles which can be covered on a Rolls-Royce car to a gallon of petrol. We do not think any of our competitors can approach the mileage we can obtain. To obtain these consumptions, the first essential is to get a free running car. This means that there must be the minimum loss in transmission, wheels and tyres. The only other alterations we make to the car itself is that we get the ignitions more advanced, remove the clutch brake, the dynamo drive and the fan belt. Thin oil is used for lubrication on all parts of the car. When the car is ready for the test, it is so free that it is possible to push it about easily with one hand | ||