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 engine number 7 E.A.C. II.
| Identifier | ExFiles\Box 69\4\ scan0284 | |
| Date | 30th March 1925 | |
| BENCH TEST REPORT TYPE OF ENGINE: E.A.C. II. ENGINE NO.: 7 E.A.C. II. DESCRIPTION OF ENGINE :- COMPRESSION RATIO: 4.04 : 1 INDUCTION SYSTEM: STANDARD. EXHAUST SYSTEM: TEST HOUSE PIPES. DATE: 30-3-25 BAROMETER: 761 m/m AIR TEMP: VALVES: STANDARD Sil-chrome (Specially heat heated) CAMSHAFT LIFT: TAPPET CLEARANCE: .004" COLD. TIMING. Valves with .010 cl:ce: | Ignition. Inlet. | Exhaust. | Pts. break fully retarded. Opens. 1° P.T.D.C. | 44° B.B.D.C. | Battery. 8° P.T.D.C. Closes. 38° P.B.D.C. | 6° P.T.D.C. | Magneto. 10° B.T.D.C. Power & Consumption. C.O. open. R.P.M. | B.HP. | Pts/hr. | Oil press: 650 | 37.65 | | 28 1/2 LBS/□" 750 | 43 | | 29 1/2 " 1000 | 55.8 | | 31 1/2 " 1250 | 70.6 | | 32 " 1500 | 84.25 | | 33 1/2 " 1750 | 95.8 | | 35 " 2000 | 101.6 | | 36 " 2250 | 102.2 | | 36 " 2500 | 2750 | Dynamo. R.P.M. Max. output at 1125 R.P.M. Amps. 11.5 Output at 2000 r.p.m. 7 1/2 Amps. Crankcase press: Slow running Engine gears Oil used Total hrs. run 19 REMARKS:- 5 LBS/□" Spring & valve removed from oil relief valve. At 200 R.P.M. oil drips from rockers with main at 24 LBS/□" & oil pressure to timing gears increased to 2 LBS/□"; relay oil temperature 50°C. OIL LEAKS. Bad from front rocker shaft feed pipe; cylinder head face porous. Bad from base of water pump housing nut. NOTE:- 3-4-25 New pistons E.73407 fitted (brass ring stops .075" wide). After tests - engine fitted to Chassis No: 98 N.K. | ||