Analysis of engine performance concerning power, detonation, and ignition settings with different camshafts and compression ratios.
| Identifier | ExFiles\Box 102\5\ scan0034 | |
| Date | 26th April 1930 | |
| -2- Hs {Lord Ernest Hives - Chair} /CHP.1/ML.26.4.30.Cotnd. (with 5.75 C.R.) shews a marked increase in power over the standard engine at speeds above 2000 R.P.M. From the point of view of detonations, the 112º shaft in the 5.75 C.R. engine is noticeably worse than standard; but if the ignition is slightly retarded, so as to effect a drop in power of not more than 2%, this engine becomes slightly better than standard in this respect. The ignition setting for these conditions is 10º before T.D.C. when the hand control is in the fully advanced position. It is suggested that an engine similar to the above should be tried in a car, as the increase B.M.E.P. above 2000 R.P.M. should noticeably improve the acceleration at that point. The 116º camshaft (having the same long duration cams as the 112º shaft) has been tested on the 5.75 compression ratio engine: a power curve of which will also be found on V.840. The effect of testing these camshafts with the same compression ratio is indicated on curve V.761. Hs {Lord Ernest Hives - Chair} /CHP. | ||
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).