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).
Performance comparison report between standard and long duration camshafts, detailing hill climb and acceleration tests.
| Identifier | ExFiles\Box 66a\2\ scan0231 | |
| Date | 20th October 1927 | |
| To Hs.{Lord Ernest Hives - Chair} from GWH.{George W. Hancock - Head Chateauroux} X8090 20.10.27. RE. PERFORMANCE BETWEEN STANDARD AND LONG DURATION CAMSHAFTS. X8090 X1725 Tests with the two camshafts for acceleration shews a better performance with the present standard camshaft up to speeds of 40 m.p.h. after which the long duration camshaft shews a better performance. The tests shewn are an average of four tests. Standard m.p.h. Long duration m.p.h. % increase Stanton Hill. 25 28 12 1st. Ticknall Hill. 49.3 51 3.4 2nd. Ticknall Hill 30 1st.gate. 31 3.3 56 finish. 54 3.5 Time. 1-3 4/5 secs. 1-1 3/5 secs. 3.4 3rd. Ticknall Hill. 32.2 37 14.9 Time. 41 2/5 secs. 37 4/5 secs. 8.7 Acceleration tests. 10 m.p.h. 20 m.p.h. 30 m.p.h. 40 m.p.h. 4 4/5 10 4/5 18 Long duration. 4 1/5 9 2/5 15 Standard. 2.5 % 12.96% 16.65% Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} | ||