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 analysis and specification drawings for the Micklewood 2 Stroke engine.
| Identifier | ExFiles\Box 54\4\ Scan034 | |
| Date | 12th July 1928 guessed | |
| MICKLEWOOD 2 STROKE POWER LOSS ANALYSIS (LEFT DIAGRAM): 100% I.M.E.P. 500 R.P.M 9% SCAVENGING THROUGH ROTARY VALVE. 4% REMOVAL OF VALVE CAPS, PLUGS ETC. 29% LOST BY INDUCING CHARGE THROUGH ROTARY VALVE & EXPELLING SAME. 31% PISTON AND BEARING FRICTION. 27% B.M.E.P. B.M.E.P. LOST MOTORING (TOP RIGHT TABLE): JACKET TEMP 80°C CAUSE OF LOSS | R.P.M. 1000 | R.P.M. 500 BLOWING SCAVENGING CHARGE THROUGH ROTARY VALVE AND INTO THE CYL. | 5.2 | 4.7 GAINED BY REMOVING ALL PLUGS AND VALVE CAPS | 2.1 | 2.1 LOST BY INDUCTING MIXTURE THROUGH ROTARY VALVE AND BLOWING IT BACK THROUGH VALVE INTO CYL. | 17.6 | 15.6 LOST BY PISTON AND BEARING FRICTION. | 20.6 | 16.6 ENGINE SPECIFICATIONS (MIDDLE RIGHT): BORE 4 1/2" STROKE 5" SWEPT VOL 79.5 CU. INS CLEARANCE 32.5 CONVENTIONAL COMPR. RATIO. 3.43. DIA. OF EX VALVE 2 3/8" SEAT WIDTH 1/4" 45° LIFT .300 BEST IGNITION PT. 14° B.T.D.C. PETROL CONS AT 500 R.P.M. 1.25 PTS./I.H.P. HR. VALVE TIMING DIAGRAM (BOTTOM LEFT): DIRECTION OF ROTATION T.D.C. (Top Dead Centre) B.D.C. (Bottom Dead Centre) CROSSHEAD INDUCTION. 167° CROSSHEAD COMPRESSION 144° AIR INLET 176° AIR RESERVOIR 174° SCAVENGING 56° EXHAUST VALVE 123° AIR PUMP PORT 284° ANGLES SHOWN: 19°, 8°, 10°, 15°, 38°, 5°, 13°, 28°, 69°, 30°, 34°, 93° EXHAUST VALVE DISPLACEMENT GRAPH (BOTTOM RIGHT): DISPLACEMENT EXHAUST VALVE LIFT INS CRANK ANGLE TAPPET CLEARANCE .010" J O C | ||