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).
Data sheet for a 20 HP engine.
| Identifier | ExFiles\Box 57\1\ Scan232 | |
| Date | 5th March 1926 guessed | |
| DATA OF 20 H.P. ENGINE X5770 H.P. TREASURY RATING: 21.6 (D²xN / 2.5) COMPRESSION RATIO: 4.75 : 1 MAX B.M.E.F: 78.5 LBS/□" CLEARANCE VOLUME: 8.42 CUB. INCHES BORE X STROKE: 3" X 4.5" TOTAL ENGINE CAPACITY: 191 CUB.INS. 3,120 C.C. FLYWHEEL DIAMETER ON PERIPHERY: 13+1" FLYWHEEL CIRCUMFERENCE: 41.2" PISTON AREA: 7.07□" WATER CAPACITY - ENGINE: 8.7 PTS. WATER CAPACITY - RADIATOR: WITH SHUTTERS INCORP. STANDARD 21.75 PTS 23.25 PTS OIL CAPACITY: 1 GALL. MAGNETO TIMING RETARD: T.D.C. BATTERY TIMING: 10° A.T.D.C. VALVE LIFT: .340" CAMSHAFT ANGLE: 110° WEIGHT OF ENGINE UNIT: 651 LBS. FLYWHEEL PERIPHERY: 1" = 8.75° ONE TOOTH OF TIMING GEAR: 7.5° VALVE TIMING: VALVE CLEARANCE COLD .004" Valve Timing Diagram: IN.OP. T.D.C. (Inlet Open at Top Dead Centre) EX.CLO 12° (Exhaust Close at 12° after Top Dead Centre) IN.CLO 44° (Inlet Close at 44° after Bottom Dead Centre) EX.OP. 48° (Exhaust Open at 48° before Bottom Dead Centre) Handwritten Note: Copy & file Initials: JHH | ||