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).
Performance graph comparing manifold only and full exhaust systems on a Phantom II engine.

Identifier  ExFiles\Box 179\2\  img007
Date  30th November 1931
  
RM.{William Robotham - Chief Engineer} P.40
30/11/31
COMPARISON OF MANIFOLD ONLY. C.O OPEN &
FULL EXHAUST SYSTEM
P.II COMPLETE SHORT TYPE EXHAUST SYSTEM
1 1/4" CAMSHAFT TO F.B.23448 4.65 C/R STD. CYL HEAD. 1.9" VALVE THROAT
MANIFOLD ONLY. R.R. TWIN CARBS. 1.4" DIA. CHOKES.
C.O OPEN.
COMPLETE P.II SHORT EXHAUST SYSTEM
Valve Timing Diagram: EX 60, IN 55, 15, .013 CL'CE
Axis Labels:
Left Y-Axis: B.H.P.
Right Y-Axis: B.M.E.P. LBS/D'
X-Axis: R.P.M.
Curve Labels:
FULL EXHAUST SYSTEM
EXHAUST BACK PR
B.H.P C.O. Closed
C.O. OPEN EXHAUST BACK PRESS.
  
  


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