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 of horsepower curves and fuel consumption differences at various engine compression levels.
| Identifier | ExFiles\Box 19\7\ Scan036 | |
| Date | 19th May 1915 guessed | |
| BRAKE H.P. R.P.M. H.P. CURVES SHOWING DIFFERENCE IN H.P. BY VARYING COMPRESSION ONLY. TAKEN ON STANDARD R-R ENGINE, FITTED WITH STANDARD CARBURETTOR & INDUCTION PIPE. FREE EXHAUST & ZEPHYR PISTONS. A 59 LBS COMPRESSION B 63 " C 66 " D 69 " E 72 " F 75 " G 78 " DIFFERENCE IN CONSUMPTION BY VARYING COMPRESSION. LBS COMPRESSION LBS OF PETROL PER B.H.P. HOUR 1750 REVS. 1250 REVS. | ||