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 graph comparing the BHP and BMEP of a 3 1/2 Litre and a 4 1/4 Litre engine against RPM.
| Identifier | ExFiles\Box 82\4\ scan0292 | |
| Date | 4th May 1936 | |
| BENTLEY MAY. 4. 1936 ① 3 1/2 LITRE - ENGINE 8.35:1 COMP. RATIO (1935 - T.T.) ② 4 1/4 LITRE - ENGINE 9.0:1 COMP. RATIO (1936 DEVELOPMENT) (UP TO MAY 4) BOTH CURVES TAKEN WITH RACING EXHAUST SYSTEMS FITTED. BUT IN THE CASE OF THE 4 1/4 LITRE ENGINE. A NEW EXPERIMENTAL SYSTEM WAS USED (RM.{William Robotham - Chief Engineer}75 MANIFOLD WITH 3" BORE STRAIGHT THRO EXHAUST PIPE.) B.H.P. B.M.E.P R.P.M. C.T.S. | ||