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).
Camshaft performance comparison, compression ratios, engine detonation, and testing of a large bore turbulent head 'China' engine.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan110 | |
| Date | 5th November 1929 | |
| Hs{Lord Ernest Hives - Chair}/ACL/AD5.11.29 contd. -2- found that the 115° was the better camshaft if each were compared in conjunction with a compression ratio having a similar margin from detonations at low speeds. It might be worth testing this point on the test bed by varying the compression ratio - by means of thickness of cylinder head gasket - with one camshaft so that detonations became of the same audible intensity as with the other camshaft. The fuel could be "doped" with paraffin and the same method employed as when finding the detonation point on the aero engines. The engine upon which we have carried out these experiments and which, at present, is fitted with the 110° camshaft, is now to be placed in a car so that we can compare its road performance with the Std. production "China" engine. We have now got a large bore turbulent head engine of 5.25/1 compression ratio - the same as 16-G4. at W.W. - on the test bed. This engine is now being run in and tomorrow we hope to supply a power curve. Hs{Lord Ernest Hives - Chair}/ACL. | ||