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).
Comparative report on petrol consumption and performance tests of cars 3.B.50 and 28.G.VI at Brooklands.
| Identifier | ExFiles\Box 108\2\ scan0247 | |
| Date | 10th June 1939 | |
| 650 1320 8006 To By.{R.W. Bailey - Chief Engineer} from rm{William Robotham - Chief Engineer}/wym.{G. Harold Whyman - Experimental Manager} C. Hs.{Lord Ernest Hives - Chair} C. Da.{Bernard Day - Chassis Design} C. Da{Bernard Day - Chassis Design}/Iv. RE/wym.{G. Harold Whyman - Experimental Manager}S/WH.10.6.39. 3.B.50 and 28.G.VI. AT BROOKLANDS. The above 2 cars were taken down to Brooklands Track on Wednesday last for comparative petrol consumption tests and performance tests on 3.B.50. 3.B.50 car was fitted with Cast Iron Engine Unit E.68 No.4, compression ratio 6.45 : 1, Camshaft EB.4482, Standard Wraith tin plated pistons .010" oversize, Rear axle ratio 11 x 41, Dunlop Fort tyres 7.00 x 16, Pressures 45 lbs./sq.in. Weight of car complete - 38 cwts. 0 qrs. 3 lbs. 28.G.VI. standard Wraith engine, compression ratio 6.25 : 1, Rear axle ratio 8 x 34, Dunlop Fort tyres 6.50 x 17. Weight of car complete - 38 cwts. 3 qrs. 7 lbs. Both engines run on Castrolite oil. Petrol consumption figures were taken on the run down to Brooklands, and the return journey, with the 2 cars maintaining similar speeds, and gave the following results:- 28.G.VI. 3.B.50. Derby to Brooklands - 12.55 m.p.g. 14.84 m.p.g. Brooklands to Derby - 13.65 " 14.97 " 3.B.50 car was run with Twin and Single exhaust systems and 2 sizes of S.U. carburetters with the results, as shown on attached sheet. rm{William Robotham - Chief Engineer}/wym.{G. Harold Whyman - Experimental Manager} | ||