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).
Summary of findings on engine performance relating to exhaust systems, camshafts, and valve areas.
| Identifier | ExFiles\Box 102\5\ scan0133 | |
| Date | 24th June 1932 | |
| -3- We find that the 'resonance' type of exhaust system with less back pressure reduces the 'roar' due to early opening inlet valves, so that slow running now more or less dictates this feature. SUMMARY. We believe we can further improve the power characteristics of our engines by altering the camshafts to take advantage of resonant intake and exhaust silencers. Results show that we ought to be able to get all the power we want with valve areas of 2.2 sq.in/litre or thereabouts. Curve Rn.{Mr Robinson}69 confirms Peregrine results that the toe of the camshaft drops the low speed M.E.P. without giving anything back at the top speeds. HS{Lord Ernest Hives - Chair}/En. | ||