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 diagrams for the Micklewood 2-stroke engine.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan46 | |
| Date | 1st September 1924 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. 29% LOST BY INDUCING CHARGE THROUGH ROTARY VALVE & EXPELLING SAME. 31% PISTON AND BEARING FRICTION. 27% B.M.E.P. TABLE: 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 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 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: DIRECTION OF ROTATION T.D.C. (Top Dead Center) B.D.C. (Bottom Dead Center) CROSSHEAD INDUCTION 167° SCAVENGING 56° EXHAUST VALVE 173° CROSSHEAD COMPRESSION 144° AIR INLET 176° AIR FUME PORT 284° AIR RESERVOIR 114° ANGLES: 19°, 8°, 93°, 28°, 69°, 13°, 38°, 9°, 14°, 18°, 10°, 15°, 54° GRAPH: DISPLACEMENT EXHAUST VALVE Y-AXIS: LIFT INS (.100, .200, .300, .400) X-AXIS: CRANK ANGLE (90° to 270°) B.D.C. TAPPET CLEARANCE .010 | ||