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).
Engine test data sheet for engine PII-21, detailing power curve, pressures, and timing.
Identifier | ExFiles\Box 19\3\ Scan238 | |
Date | 27th March 1930 | |
ENGINE N.o: PII-21 TYPE: Left Handed DATE COMPLETED TEST: 27-3-30 DATE REC'D ON TEST: 26-3-30 HOURS RUN DURING TEST: 5 CLEARANCE VOLUME: N.o 1 CYL.: ___ CU. INS., N.o 6 CYL.: ___ CU. INS. AVERAGE COMPRESSION RATIO: ROCKER CLEARANCE (COLD): INLETS = .006", EXHAUSTS = .006" IGNITION TIMING: (HAND CONTROL FULLY ADVANCED.) MAGNETO = 15° BEFORE T.D.C. BATTERY = 15° BEFORE T.D.C. POWER CURVE ETC. (Power & Compression Figures Corrected to N.T.P.) BAR. = 763 m/m.{Mr Moon / Mr Moore} POWER CURVE TABLE: R.P.M. | Corrected B.M.E.P | Corrected B.H.P. | PETROL CONSUMPTION (Actual PTS/HR, Specific PTS/BHP/HR) | DEPN IN MANIFOLD (INS Hg) | POSITION OF MIX. CONTROL | COMPRESSION PRESSURE (LBS PER SQ. IN.) (1, 2, 3, 4, 5, 6, AVERAGE) 3250 | - | - 3000 | 62.0 | 110.0 2750 | 71.5 | 116.2 | | | | 86.0 2500 | 78.3 | 115.7 | | | | 86.0 2250 | 82.5 | 109.7 | | | | 87.5 2000 | 87.0 | 103.0 | | | | 89.0 1500 | 92.7 | 82.2 | | | | 86.0 1000 | 93.7 | 55.5 | | | | 82.0 750 | 94.5 | 41.4 | | | | 83.0 640 | 97.3 | 36.8 DISTRIBUTION TEST: R.P.M. | LOAD WITH SIX CYLS. FIRING | LOAD WITH FIVE CYLINDERS FIRING (1. OUT, 2. OUT, 3. OUT, 4. OUT, 5. OUT, 6. OUT) | AV. LOAD DROP PER CYLINDER 2500 | 1000 | OIL PRESSURES. (LBS PER SQ. IN.): R.P.M. | MAIN | INTMD | LOW | OIL TEMP 2500 | 65 to 70 pressure 1500 | at... temperature 500 | VALVE TIMING: | .020 CLCE | N.o1 CYLINDER | N.o6 CYLINDER INLET OPENS | 10½° AFTER T.D.C. | AFTER T.D.C. INLET CLOSES | 46½° AFTER B.D.C. | AFTER B.D.C. EXHAUST OPENS | 47° BEFORE B.D.C. | BEFORE B.D.C. EXHAUST CLOSES | 4° after T.D.C. | T.D.C. DETONATIONS. (FULL THROTTLE. WATER TEMP = 80°C) SPEED AT WHICH DETONATIONS BECOME JUST AUDIBLE, @ LISTENING CLOSE UP TO ENGINE = ____ R.P.M. @ LISTENING EIGHT FEET FROM ENGINE = ____ R.P.M. Timing Gears: Fairly free from any noise. Very slight rattle at low speed when off charge. Oil Pump Gears: OK Remarks: The above power curve was taken without hot spot (except at 640 RPM). A standard silencer was fitted but no fishtail. The ignition was set for max. power at each speed as the oil relay was not connected up. Engine very free. SPECIAL PARTS FITTED. SCHEME | DESCRIPTION STAMP: R-R LTD, PAINT R, 13 DEC 1929, DERBY | ||