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).
Standard performance test results on various hill climbs for a 12-G-W 25 HP engine.
| Identifier | ExFiles\Box 29\3\ Scan349 | |
| Date | 13th July 1920 guessed | |
| STANDARD PERFORMANCE TESTS ON 12-G-W 25 HP. Stanton hill. - Ticknall hill. - 66 secs. Piston hill. - Special Engine. Performance test with 11 tooth axle. Standard carb. S.U. Carb. Stanton hill 21.6 secs. 20.4 secs. Ticknall " 59.2 " 56 secs. Piston " 57 secs. 55 secs. Special engine. Performance test with 12 tooth axle. Standard carb. S.U. Carb. Stanton hill 23 secs. 23 secs. Ticknall hill 58.6 secs. 56.2 secs. Piston hill 63 secs. 61.9 secs. Special engine 112° camshaft. Compression ratio 5.45 to 1. Timed .8" B.T.D.C. | ||