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 inlet valve lift of a Lorraine-Dietrich engine against a 20 HP R.R. engine.
| Identifier | ExFiles\Box 5a\5\ 05-page019 | |
| Date | 18th March 1927 | |
| LORRAINE-DIETRICH ENGINE INLET VALVE LIFT DIAGRAM VALUE LIFT (INCHES) LORRAINE 20 H.P. R.R. THE LIGHTLY DOTTED CURVE REPRESENTS THE PROPOSED 20 H.P. R.R. WITH ACTION OF THE LIFT WHICH IS AS HIGH AS THE LORRAINE DEGREES OF MOVEMENT OF CRANKSHAFT (MEASURED FROM TOP OF CAM). *DURATION OF LIFT (LORRAINE) = 280° *DURATION OF LIFT (20 H.P. R.R.) = 312° *NO TAPPET CLEARANCE | ||