Rolls-Royce Archives
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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
  
  


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