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).
Graph comparing the performance of a single-cylinder unit against a main engine.
| Identifier | ExFiles\Box 134\2\ scan0069 | |
| Date | 10th July 1936 | |
| BENTLEY FIG. IV COMPARISON OF SINGLE CYLINDER UNIT & MAIN ENGINE CYLINDER HEADS:- STANDARD BENTLEY E.B. 615 & E.B. 1517 VALVE TIMING:- I.O. 4°E ; I.C. 51°L ; E.O. 51°E ; E.C. 7°L C.R. = 6.4 OPEN EXHAUST BORE :- 3.25" SINGLE CYLINDER (N.A.) SINGLE CYLINDER (MAIN ENGINE DEPN) MAIN ENGINE B.M.E.P. B.H.P R P M J.L.E. 10-7-36 | ||