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).
Graph and analysis of engine performance, focusing on Mean Effective Pressure and detonation characteristics.
| Identifier | ExFiles\Box 123\5\ scan0282 | |
| Date | 1st February 1939 | |
| -4- ③ As CURVE ① But STD PISTONS .030 BELOW CYLINDER BLOCK 6.25:1 COMP RATIO ---- MAX POWER x---x NON DETONATING MEP IGN MEP lbs/□' IGN ADV. °BTDC R.P.M. Curve (3) with the cylinder head as designed but incorporating the increased transfer throat area PD.292 - 1.75 sq.in. - 6.25 : C.R. a maximum MEP of 126 lbs/sq.in. is developed at 2000 r.p.m. and from 1000 r.p.m upwards the engine is clear of detonation at full throttle. At 3000 r.p.m it will be seen that it is necessary to over advance by approx. 15° to bring in detonations. Below 1000 r.p.m. the engine detonates on full power and at 750 r.p.m. the power has to be dropped by approx. 4 lbs/sq.in. by retarding to be clear of detonation. Continued. | ||