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 comparing intake manifold pressure and vacuum against engine RPM for supercharged and non-supercharged engines.

Identifier  ExFiles\Box 173\3\  img045
Date  1st April 1934 guessed
  
INTAKE MANIFOLD PRESSURE
3 1/4 X 4 SUPERCHARGED ENGINE
RATIO
SUPERCHARGER TO CRANKSHAFT
5.26 : 1

PRESSURE

ATMOSPHERE LINE

VACUUM

INTAKE MANIFOLD VACUUM
3 1/4 X 4 ENGINE
NOT SUPERCHARGED

CARBURETOR VACUUM
3 1/4 x 4 SUPERCHARGED ENGINE

Y-AXIS: INCHES OF MERCURY

X-AXIS: ENGINE R.P.M.
  
  


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