Power-output graph for a 4¼ Litre Bentley, comparing an Overhead Camshaft conversion unit to the standard engine.
| Identifier | ExFiles\Box 113\5\ scan0217 | |
| Date | 2nd March 1941 guessed | |
| UNIT No: 23. 4¼ LITRE BENTLEY. POWER- OUTPUT. OVERHEAD CAMSHAFT CONVERSION UNIT. S.20. ① O-H-C. ENGINE. 6·5 : 1 COMP: RATIO OPEN EXHAUST ①a AS ① BUT WITH STD: EXH: SILENCER. ② STANDARD 4¼ LITRE ENGINE OPEN EXHAUST. ②a AS ② BUT WITH STD: EXH: SILENCER B.H.P. B.M.E.P. R.P.M. C.T.S | ||
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).