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 sheet for the Micklewood 2-stroke engine.
| Identifier | ExFiles\Box 54\4\ Scan053 | |
| Date | 10th September 1922 guessed | |
| MICKLEWOOD 2 STROKE 100% I.M.E.P. 500 R.P.M 9% SCAVENGING THROUGH ROTARY VALVE. 4% REMOVAL OF VALVE CAPS, PLUGS ETC. LOST BY INDUCING 29% CHARGE THROUGH ROTARY VALVE & EXPELLING SAME. 31% PISTON AND BEARING FRICTION. 27% B.M.E.P. B.M.E.P. LOST MOTORING JACKET TEMP 80°C CAUSE OF LOSS | R.P.M. | 1000 | 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 INDUCING 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 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 Text: DIRECTION OF ROTATION T.D.C. B.D.C. CROSSHEAD INDUCTION 167° AIR RESERVOIR 174° SCAVENGING 56° EXHAUST VALVE 173° AIR PUMP PORT 204° AIR INLET 116° CROSSHEAD COMPRESSION 144° Displacement Graph Text: DISPLACEMENT EXHAUST VALVE LIFT INS CRANK ANGLE B.D.C TAPPET CLEARANCE .020 | ||