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).
Dynamometer power curves for a Wraith III engine, run in direct gear.
Identifier | ExFiles\Box 97\3\ scan0179 | |
Date | 24th June 1939 | |
DYNO POWER CURVES RUN IN DIRECT GEAR. ON 6.50 X 16 DUNLOP FORT TYRES @ 45LB/IN.² B.H.P. CORR. TO 50°C AIR TEMP. CHASSIS No 14 B V (12 : 41 AXLE RATIO) ENGINE WRAITH III No 10. CYL. HEAD EX 34205 IN. VALVE EW 1429 EX. VALVE PD 403. PISTONS P 451 A (-330 RAISED CROWN) AEROLITE CR.{Mr Cra???ster / Mr Chichester} 7.25 : 1 IND. PIPE. EXS. 1346 1.750 BORE CARBS. SU. TYPE H6 (WO 3 NEEDLES) 1.750 THROTTLE BORE. CAMSHAFT EXS. 768 (@ .030 C'L'C'E) I.O. 1.5° A.T.D.C. E.O 40° B.B.D.C. I.C. 46° A.B.D.C. E.C. 6° A.T.D.C. CURVES A.{Mr Adams} REFER TO TWIN EXHAUST SYSTEM CURVES B. REFER TO STD. B.V. SYSTEM. TEST BED CLUTCH H.P. HUB HP i.e. CLUTCH HP. - EXH. & TRANSMISSION LOSS. ROAD WHEEL DYNO HP. M.P.H. BASED ON 720 WHEEL REVS./MILE. 12 : 41 AXLE RATIO, 1.2:1 OVERDRIVE RATIO. ENGINE R.P.M. RM{William Robotham - Chief Engineer} / TAS{T. Allan Swinden} / 24.6.39 | ||