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 conclusions, unit specifications, and test conditions.
| Identifier | ExFiles\Box 133\3\ scan0041 | |
| Date | 28th February 1939 | |
| -2- Conclusions - Cont'd.{John DeLooze - Company Secretary} (6) Injection pressures up to 5000 lbs/sq.in. (340 atm) are fairly satisfactory, but above this figure, wear and tear on the pump and injector become rather severe. (7) Standard performance figures show 102 BMEP at 2000 R.P.M. and 125 BMEP at 1000 R.P.M. Particulars of Unit. Bore and Stroke............... 6.00" x 8.00" Compression Ratio...14.2; Clearance volume.....17.1 cu. ins. Conn Rod. length............ 13.250" Valve lift.................. 0.475" Total area past inlet valves...... 5.024 sq.ins. Total area past exhaust valves.... 5.138 sq.ins. Piston speed at 2000 R.P.M......... 2667 ft/min. Bosch injection pump (10m/m dia. plunger). Camshaft drives are through helical splines and the phasing of the valves may be varied by 20°. The injection timing may be varied by 34°. Big end bearing.............. 3.000 dia. x 2.500 long. Gudgeon pin................. 1.250 dia. Injection nozzle central in head. Pointed top piston. General Conditions of Tests. Engine speed................ 2000 R.P.M. Max. pressure............... 1000 lbs/sq.in. Injection valve lifts at.... 2000 lbs/sq.in. Jacket water temp........... 75°-80°C. Oil temp.................... 55°-60°C. Valve timing:- I.O. 12°L; I.C. 28°E; E.O. 30°E; E.C. 10°L. Fuel injection for normal load.. .235 cc/cycle. (Assumed vol. effy. 80%; 30% excess air and air/fuel ratio 14/1 by weight). | ||