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 showing the effect of a supercharger on engine power and efficiency for a Graham Model 67 & 69 engine.
| Identifier | ExFiles\Box 173\3\ img046 | |
| Date | 1st April 1934 | |
| FIRM GRAHAM MODEL 67 & 69 SERIAL NO. TEST NO. 526-4-34 NO. CYL. 8 BORE 3 1/4 STROKE 4 DISPLACEMENT 265.4 COMPRESSION RATIO DATE FUEL GASOLINE For Details see Specification Sheet PAGES 6, 8, 14 and Log Sheet S.C. BOOK 1 S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} ENGINE TESTING FORMS HIGH SPEED, MEDIUM-POWER ENGINES CURVE SHEET - D3 EFFECT OF SUPERCHARGER ON ENGINE POWER AND EFFICIENCY 3 1/4 X 4 SUPERCHARGED ENGINE STROMBERG CARBURETOR, - 5.76:1 SUPERCHARGER RATIO, - 6.72:1 COMPRESSION RATIO A.C. CLEANER AND SILENCER --- 3 1/4 X 4 ENGINE - NOT SUPERCHARGED COMPRESSION RATIO - 6.72:1 NOTE: THESE CURVES PLOTTED FROM LABORATORY OBSERVATIONS. NOT CORRECTED FOR BAROMETRIC PRESSURE OR AIR TEMPERATURE. Mechanical Efficiency, per cent Horsepower, and Brake, Mean Effective Pressure Fuel, lb. per b. hp.-hr. Thermal Efficiency, per cent Torque, lbs-ft. R.P.M. Revised February 1928 by the Society of Automotive Engineers, Inc., 29 W. 39th St.{Capt. P. R. Strong}, New York City | ||