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).
Comparison graph of standard and 'R' type camfollowers for a Bentley engine.
| Identifier | ExFiles\Box 3\6\ 06-page297 | |
| Date | 4th July 1935 | |
| COMPARISON OF STANDARD & 'R' TYPE CAMFOLLOWERS (BENTLEY) UNIT: B.4 HIGH COMPRESSION ALUMINIUM CYLINDER HEAD COMPRESSION RATIO . 7.30 : 1 EXHAUST VALVES 1.200 DIA. INLET VALVES 1.500 DIA. NO AIR SILENCER STANDARD BENTLEY CAMSHAFT E.B. 1085. AEROLITE 'RACING' PISTONS. ① STANDARD CAM-FOLLOWERS GIVING 'A' TIMING ② 'R' TYPE CAM-FOLLOWERS (.750 RAD) GIVING 'B' TIMING VALVE TIMING WITH .010 CLEARANCE 'A' TIMING T.D.C. 35° 4.5° E.I.N. E.X.C. 49.5° 'B' TIMING T.D.C. 50° 11.5° E.I.N. E.X.C. 58.5° Y-AXIS: B.M.E.P. (LB/SQ") X-AXIS: R.P.M. | ||