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 test results for the Phantom II and 25HP engines, highlighting requirements for improved components.
| Identifier | ExFiles\Box 13\2\ 02-page075 | |
| Date | 30th May 1931 | |
| Copy 87090. 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 By.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} Hs.{Lord Ernest Hives - Chair}4/KT.30.5.31. ENGINE POWERS. X.5090. X.7090. X.5770. X.7770. We have been able to obtain a maximum of 180 H.P. 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 serous constructional alterations required such as gas passages, valve sizes, in order to obtain substantial power increase at high speeds. Hs.{Lord Ernest Hives - Chair} | ||