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).
Comparison of engine valve timing results for various Goshawk engine and camshaft combinations.
| Identifier | ExFiles\Box 48\4\ Scan104 | |
| Date | 16th July 1923 | |
| E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} X4226 Hs{Lord Ernest Hives - Chair}1/LG16.7.23. GOSHAWK TIMING. X.4229 X.4238 X3942 X.4226 X.3310 The results given on the Charts were all taken on Goshawk 1. engine with Goshawk 1. Cams. The average Goshawk 11 timing was with the nearest approximate which can be obtained with Goshawk 1. Cams. The average Goshawk 11. timing taken on Goshawk 11 engines is as follows :- Average Goshawk 1. G.1 Cams. G.11 Timing. Best. I.O 12º I.O 12º I.O 5º B.D.P. I.C 53º I.C 49º I.C 32º E.O 49º E.O 39º E.O 42º E.C 5º E.C 5º E.C D.P. You will see this closely follows the drawing figures. We ought to have made it more clear that the average Goshawk 11. timing was the best average which could be obtained with Goshawk 1. Cams. With Goshawk 11. timing and cams, we should expect slightly worse results than with the best average Goshawk 11 timing obtained with Goshawk 1. cams. With regard to the new Camshaft. We imagined that we were having a longer exhaust valve cam with less angle between the valves; the inlet valve remaining the same length as at present except that it would open earlier and close earlier and that there would be a slight overlap between I.C and E.O. I.O 5º B.D.P. I.C 36º E.O 45º E.C 10º Hs.{Lord Ernest Hives - Chair} | ||