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 chart comparing a supercharged and a non-supercharged Graham engine.
| Identifier | ExFiles\Box 173\3\ img085 | |
| Date | 4th April 1934 guessed | |
| FIRM: GRAHAM MODEL 67 & 69 SERIAL Nº TEST Nº 326-4-5A DATE 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. CURVE SHEET - 03 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. THERMAL EFFICIENCY PER CENT. TORQUE LB-FT R.P.M EFFECT OF SUPERCHARGER ON ENGINE POWER AND EFFICIENCY 3 1/4 x 4 SUPERCHARGED ENGINE 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 COMPRESSION RATIO - 6.72:1 NOTE:- THESE CURVES PLOTTED FROM LABORATORY OBSERVATIONS, NOT CORRECTED FOR BAROMETRIC PRESSURE OR AIR TEMPERATURE | ||