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 an engine run in direct gear.
| Identifier | ExFiles\Box 97\3\ scan0264 | |
| Date | 24th June 1939 | |
| DYNO POWER CURVES RUN IN DIRECT GEAR. ON 6.50 X 16 DUNLOP FORT TYRES @ 45LB/IN.² CHASSIS N⁰: 14 B V (12:41 AXLE RATIO) ENGINE: WRAITH III N⁰:10. CYL. HEAD: EX 34205 IN. VALVE: EW 1429 EX. VALVE: P.D. 403. PISTONS: P 451 A (.330 RAISED CROWN) AEROLITE C.R.: 7.25 : 1 IND. PIPE: EXS. 1346 1.750 BORE CARBS.: S.U. TYPE H6 (WO 3 NEEDLES) 1.750 THROTTLE BORE CAMSHAFT: EXS. 768 (@ .030 C'L'CE) I.O. 1:6° AT.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: REFER TO TWIN EXHAUST SYSTEM CURVES B: REFER TO STD. B.V SYSTEM. B.H.P. CORR. TO 50 C AIR TEMP. ENGINE R.P.M. TEST BED CLUTCH H.P. HUB HP i.e. CLUTCH H.P. - EXH. & TRANSMISSION LOSS. ROAD WHEEL DYNO H.P. M.P.H. BASED ON 720 WHEEL REVS./MILE. 12:41 AXLE RATIO. 1.2:1 OVERDRIVE RATIO. | ||