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).
Power test results comparing different sized inlet valves for an 8.1 litre Phantom engine.

Identifier  ExFiles\Box 17\6\  Scan163
Date  8th September 1933
  
H.S. 1147
8.1 LITRE PHANTOM POWER TESTS. (P.II N° 27.)
COMPARISON BETWEEN VARIOUS SIZED INLET VALVES (STANDARD EXHAUST)
2-1 7/8 S.U. CARBS. - STD. CAMSHAFT (F.{Mr Friese} 82448) - COMP. RATIO 5.5:1.
R.R. LEAD BRONZE BEARINGS + OPEN EXHAUST.
STD. SPRINGS
② STANDARD INLET VALVES (F.82458) (1 1/8 THROAT)
③ INLET VALVES SAME AS EXHAUST (F.83700) (1 1/8 THROAT)
① LARGE INLET VALVES (F.83904) (2.000 THROAT)
TULIP LIGHTENED TO (LEC 3579)
STEM DRILLED TO (EX 12011)
NEW WEIGHT 5.32 OZS.
ORIGINAL WEIGHT 6.53 OZS.
H.S. 664/5.
DOUBLE TAPER VALVE SPRINGS
N° ① AND ② CURVES ARE AN AVERAGE OF SEVERAL TESTS.
B.H.P.
M.E.P. (LBS/□")
R.P.M.
TIMING WITH OZO CLCE
TDC
EC 4°
IO 1°
IC 51°
EO 51°
R.W.P. 8.9.33
  
  


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