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).
Graph showing the effect of a supercharger on engine power and efficiency for a Graham Model 67 & 69 engine.

Identifier  ExFiles\Box 173\3\  img046
Date  1st April 1934
  
FIRM GRAHAM MODEL 67 & 69 SERIAL NO. TEST NO. 526-4-34
NO. CYL. 8 BORE 3 1/4 STROKE 4 DISPLACEMENT 265.4 COMPRESSION RATIO DATE
FUEL GASOLINE For Details see Specification Sheet PAGES 6, 8, 14 and Log Sheet S.C. BOOK 1
S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} ENGINE TESTING FORMS
HIGH SPEED, MEDIUM-POWER ENGINES
CURVE SHEET - D3
EFFECT OF SUPERCHARGER ON ENGINE POWER AND EFFICIENCY
3 1/4 X 4 SUPERCHARGED ENGINE
STROMBERG CARBURETOR, - 5.76:1
SUPERCHARGER RATIO, - 6.72:1 COMPRESSION RATIO
A.C. CLEANER AND SILENCER
---
3 1/4 X 4 ENGINE - NOT SUPERCHARGED
COMPRESSION RATIO - 6.72:1
NOTE: THESE CURVES PLOTTED FROM LABORATORY OBSERVATIONS. NOT CORRECTED FOR BAROMETRIC PRESSURE OR AIR TEMPERATURE.
Mechanical Efficiency, per cent
Horsepower, and Brake, Mean Effective Pressure
Fuel, lb. per b. hp.-hr.
Thermal Efficiency, per cent
Torque, lbs-ft.
R.P.M.
Revised February 1928 by the Society of Automotive Engineers, Inc., 29 W. 39th St.{Capt. P. R. Strong}, New York City
  
  


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