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).
Performance curve graph comparing the effect of a supercharger on a Graham 8-cylinder engine's power and efficiency.
| Identifier | ExFiles\Box 178\2\ img153 | |
| Date | 9th March 1934 guessed | |
| FIRM: GRAHAM MODEL: 67 & 69 SERIAL Nº: TEST Nº: 326-4-5A. Nº CYL: 8 BORE: 3 1/4 STROKE: 4 DISPLACEMENT: 265.4 COMPRESSION RATIO: FUEL: GASOLINE FOR DETAILS SEE SPECIFICATION SHEET PAGES 6 & 14 AND LOG SHEET S.C. BOOK. I. EFFECT OF SUPERCHARGER ON ENGINE POWER AND EFFICIENCY 3 1/4 x 4 SUPERCHARGED ENGINE (Solid Line) STROMBERG CARBURETTER - 5.76:1 SUPERCHARGER RATIO, - 6.72:1 COMPRESSION RATIO A.C. CLEANER AND SILENCER 3 1/4 x 4 ENGINE - NOT SUPERCHARGED (Dashed Line) COMPRESSION RATIO - 6.72:1 NOTE:- THESE CURVES PLOTTED FROM LABORATORY OBSERVATIONS, NOT CORRECTED FOR BAROMETRIC PRESSURE OR AIR TEMPERATURE Vertical Axis Labels (Left): CURVE SHEET - D.3. S.A.E. ENGINE TESTING FORMS. HIGH SPEED MEDIUM POWER ENGINES MECHANICAL EFFICIENCY, PER CENT. HORSEPOWER AND BRAKE MEAN EFFECTIVE PRESSURE FUEL, LBS. PER B.HP. HR Vertical Axis Labels (Right): THERMAL EFFICIENCY, PER CENT. TORQUE LB. FT. Horizontal Axis Label (Bottom): R.P.M | ||