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).
Engine performance improvements, carburetter testing, and the potential for a twin-valved engine.
| Identifier | ExFiles\Box 147\5\ scan0046 | |
| Date | 2nd September 1913 | |
| R9/P 2.9.13. COPY. Sheet. 3 to increase the power and decrease the consumption per horsepower at high engine speeds. It would be necessary with such a test, when running at the high speed, to use the larger carburetter, other- wise I fear that the engine would be capable of taking so much gas that our usual standard carburetter would be past its range. We must not forget that we are not building a racing engine for our usual work, and if we want a racing engine, and racing conditions, we shall have to put such an engine in hand, and in these days the only thing to do is to use twin valves, and I have thought that a twin valved engine can be made very nicely out of our present engine or 4 X 6. This I will look into if it is thought worth while. With reference to consumption in the standard trials, since the consumption was so surprising, I should have thought that whoever was the author of it would have got it checked before advertising it. I might lead to some unpleasant contradictions. With reference to future tests of petrol consumption, this will be done I expect by the engine testing depart- ment when they have their new dynamometer in work. However, it can be done with the present old dynamo. It is no use expecting anything more than very poor consumption at these high engine speeds, and I think it | ||