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).
Engine power outputs, camshafts, and carburettors for the P.II, 25 HP, and Phantom models.
| Identifier | ExFiles\Box 182\M19\ img186 | |
| Date | 30th September 1931 | |
| To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to Hy.{Tom Haldenby - Plant Engineer} PN.{Mr Northey} ORIGINAL. Hs.{Lord Ernest Hives - Chair}4/KT.30.S.31. X5090 X7090 X5770 X7770 ENGINE POWERS. We have been able to obtain a maximum of 180 HP. from a P.II. engine using camshafts with R.{Sir Henry Royce} engine cams, low depression carburetter and open exhaust. Briefly the position is that on the 25 HP. we have at the moment a satisfactory camshaft to give us the power, but we require an improved carburetter and induction system, and exhaust system. In any case, on the Phantom we have the twin carburetters, but for that engine we have no satisfactory camshaft. The recent test shews that there are no serious constructional alterations required such as gas passages, valve sizes, in order to obtain substantial power increase at high speeds. Hs.{Lord Ernest Hives - Chair} | ||