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).
Horsepower curves of foreign cars, specifically the Buick and Marmon, and plans for re-testing.
| Identifier | ExFiles\Box 32\5\ Scan155 | |
| Date | 20th May 1921 | |
| X1692 To R A E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to BJ & CJ. c. to EWT. for R.R. Inc. Hs{Lord Ernest Hives - Chair}1/LG20.5.21. X1692 X 3717 HORSE POWER CURVES OF FOREIGN CARS. Attached please find curves showing HP. obtained on the Dynamometer with various foreign cars. The Buick and Marmon tests were taken a considerable time ago. Since then we have decided to test all cars without Silencers. At the first opportunity we will repeat the test on the Marmon car; we think there must be some error, in the way the efficiency falls off at low speeds. This is possibly due to the carburetter or faulty ignition timing. The reason for the Buick HP. falling off rapidly at high speeds, is very possibly due to the Silencer. It will be seen that the power efficiency of the Marmon car is very good indeed. Hs.{Lord Ernest Hives - Chair} | ||