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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).
Diagram comparing the exhaust valve lift of a Lorraine-Dietrich engine and a 20 HP R.R. engine.

Identifier  ExFiles\Box 22\4\  Scan097
Date  18th March 1927
  

LORRAINE-DIETRICH ENGINE.
EXHAUST VALVE LIFT
DIAGRAM.
VALVE LIFT (INCHES).
LORRAINE
20 H.P. R.R.
THE LIGHTLY DOTTED CURVE
REPRESENTS THE POSITION
THE 20 H.P. R.R. WOULD
ASSUME IF THE LIFT WERE
AS HIGH AS THE LORRAINE.
* DURATION OF LIFT (LORRAINE) = 280°
* DURATION OF LIFT (20 H.P. R.R.) = 328°
* NO TAPPET CLEARANCE
DEGREES OF MOVEMENT OF CRANKSHAFT (MEASURED FROM TOP OF CAM).
  
  


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