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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).
Blueprint diagram comparing the inlet valve lift of a Lorraine-Dietrich engine with a 20hp R.R. engine.

Identifier  ExFiles\Box 22\4\  Scan099
Date  18th March 1927
  
2
LORRAINE-DIETRICH ENGINE
INLET VALVE LIFT
DIAGRAM.
VALUE LIFT (INCHES)
LORRAINE
20hp R.R.
THE LIGHTLY DOTTED CURVE REPRESENTS THE POSITION THE 20hp R.R. WOULD ASSUME IF THE LIFT WERE AS HIGH AS THE LORRAINE.
* DURATION OF LIFT (LORRAINE) = 280°
* DURATION OF LIFT (20hp R.R.) = 312°
* NO TAPPET CLEARANCE.
DEGREES OF MOVEMENT OF CRANKSHAFT (MEASURED FROM TOP OF CAM).
  
  


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