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 showing the effect of induction pipe diameter on a twin carburetor engine.

Identifier  ExFiles\Box 179\2\  img055
Date  27th November 1931
  
RM{William Robotham - Chief Engineer} P.36
27/11/31
EFFECT OF PIPE DIA ON TWIN CARB.
114° CAMSHAFT T-H-O INLET CAMS HIGH LIFT ROCKERS
OPEN EXHAUST COMP. RATIO 4·65:1 1·3" CHOKES
INDUCTION PIPE DIA 1·875
1·550
Valve Timing Diagram:
T.D.C
Ex (Exhaust): opens 49° BBDC, closes 2.5° ATDC
In (Inlet): opens 1.5° BTDC, closes 52° ABDC
020 CLCE
Left Y-Axis: B.H.P.
Right Y-Axis: B.M.E.P. Lbs/sq in
X-Axis: R.P.M.
  
  


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