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).
Bench test report for an EAC Low Compression engine.
| Identifier | ExFiles\Box 69\4\ scan0268 | |
| Date | 13th January 1925 | |
| BENCH TEST REPORT. Y8771 TYPE OF ENGINE: EAC. LOW COMPN: ENGINE NO.: IV EAC II DESCRIPTION OF ENGINE: - COMPRESSION RATIO: 3.925-1 INDUCTION SYSTEM: Standard - Double branch EXHAUST SYSTEM: Straight through pipes Cut out open. DATE: 13.1.25 BAROMETER: 762 AIR TEMP: 15.2° VALVES: Silchrome Tulip 45° CAMSHAFT LIFT: .423" (110° LOW LIFT) TAPPET CLCE: .010" TIMING. Valves with .010" clce: Inlet. | Exhaust. 1 | 6 | 1 | 6 Opens: T.O.C. | 2.7 | 47.5 | 47 Closes: 49° | 38° | 4.3° | 9° Ignition. Pts. break fully retarded. Battery: 6° B.T.D.C. Magneto: 14° A.T.D.C. Power & Consumption. | C.O. open. R.P.M. | B.HP. | Pts/hr. | Oil press: 600 | 35.2 | | 27 | 60°C 750 | 44 | | 29 1000 | 56 | | 30.5 1250 | 70 | | 32 1500 | 82 1/4 | | 33 1750 | 94 1/4 | | 34 2000 | 104 1/4 | | 35 2250 | 109 1/2 | | 35 | 67°C 2500 2750 Dynamo. Max. output at r.p.m. Amps. Output at 2000 r.p.m. Crankcase pressure Slow running Engine gears: Very fair Oil used: Prices Motorine 'C'. Total hrs. run: 70 hrs. REMARKS:- Both ignitions were set at 22° B.T.C. with hand quadrant fully advanced to obtain maximum power at low speeds. It was not necessary to reduce the advance at high speeds as maximum power was obtained. After tests - engine fitted to Chassis No. | ||