Performance graph comparing different Bentley cylinder heads, showing Brake Horsepower and B.M.E.P. against R.P.M.
| Identifier | ExFiles\Box 86\1\ scan0056 | |
| Date | 10th March 1934 | |
| B.V.22 COMPARISON OF CYLINDER HEADS (BENTLEY) UNIT:- B.4.A ① ALUMINIUM CYLINDER HEAD (COMPRESSION RATIO 7.38 : 1) ② CAST IRON " (COMPRESSION RATIO 7.38 : 1) ③ " " " INLET TAPPETS .011 EXHAUST .009 NO AIR SILENCER INLET 1.450 OPEN EXHAUST EX 1.200 ④ Standard Head E.B.615 INLET 1.40 COMP. RATIO 6.45 EX 1.30 B.H.P. B.M.E.P (LB/SQ") R.P.M. VALVE TIMING (.020 CLEARANCE) T.D.C. 3° 7° EXH INL 51° 45° RHL 10.3.34 | ||
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).