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).
List of questions concerning the design and performance characteristics of 2-stroke sleeve-valve engines.
Identifier | ExFiles\Box 134\5\ scan0155 | |
Date | 26th September 1940 | |
COPY. Wd.{Mr Wood/Mr Whitehead} from Rm.{William Robotham - Chief Engineer} 2-Stroke Engines, ============= Confirming our discussion with you the other day. We are interested in the following points in connection with the 2-stroke operation. 1. You have enormous port areas on your sleeve-valve engine. How much can you reduce the port area on the exhaust side before you get an appreciable loss in power? What is the answer to the same manoeuvre on the inlet side? It is interesting to note that the G.M. poppet valve has a throat area about one third of your sleeve valve. 2. If a very sudden opening does have any appreciable effect on power, can Kadenacy claim any patent on this particular manoeuvre? It seems to me strange if one can patent any particular valve type. 3. Can you, with your sleeve-valve engine, get an appreciably larger inlet port or better timing than if the piston uncovered the port only and you had no sleeve? 4. I would like to see a curve of B.M.E.P., against boost pressure for the engine as you at present have it. What do you consider is the minimum boost at which the engine will operate satisfactorily? 5. What do you consider to be the minimum piston speed at which the engine will two-stroke consistently? Rm.{William Robotham - Chief Engineer} | ||