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 | |
| ① 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). | ||