Blueprint graph comparing power (BHP) and BMEP against RPM for different piston types and compression ratios with a Bentley camshaft.
| Identifier | ExFiles\Box 148\1\ scan0163 | |
| Date | 1st May 1939 | |
| PISTONS POWER S. 83 MAY. 1939 W. III N°4 (BENTLEY CAMSHAFT) " INDN. SYSTEM) ① R.R. SPLIT SKIRT C/R = 6.0 : 1 ② AEROLITE (FLAT TOP) C/R = 6.0 : 1 ③ " (200 BUMP) C/R = 6.5 : 1 ④ " (330 ") C/R = 7.0 : 1 ⑤ " (470 ") C/R = 8.0 : 1 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).