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 showing a 20 HP engine power increase due to long duration valve lift when using the standard carburettor.
| Identifier | ExFiles\Box 5a\5\ 05-page056 | |
| Date | 11th July 1927 guessed | |
| 20 HP POWER INCREASE DUE TO LONG DURATION OF VALVE LIFT, WHEN USING THE STANDARD CARBURETTOR ENGINE N° 11-GTE COMPRESSION RATIO - 5.15 TO 1. CADUCE VALVES (1-410 DIA) SPECIAL LONG DURATION CAMSHAFT THE DOTTED CURVES REFER TO RESULTS OBTAINED WITH STANDARD CAMSHAFT (OTHER CONDITIONS BEING SIMILAR). Left Y-Axis: BRAKE HORSE POWER Right Y-Axis: BRAKE MEAN EFFECTIVE PRESSURE (LBS/SQ") Bottom X-Axis: R.P.M. OF ENGINE Curve Labels: B.H.P., B.M.E.P. | ||