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

Identifier  ExFiles\Box 173\3\  img084
Date  4th April 1934 guessed
  
INTAKE MANIFOLD PRESSURE
3 1/4 x 4 SUPERCHARGED ENGINE
RATIO
SUPERCHARGER TO CRANKSHAFT
5.76 : 1

ATMOSPHERE LINE

PRESSURE
VACUUM

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

CARBURETTER VACUUM
3 1/4 x 4 SUPERCHARGED ENGINE

INCHES OF MERCURY
ENGINE R.P.M.

7 6 5 4 3 2 1 0 1 2 3 4 5 6 7

0 400 800 1200 1600 2000 2400 2800 3200 3600 4000
  
  


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