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).
Various design options for compression ignition engines, including sleeve, double piston, and Junkers types.
| Identifier | ExFiles\Box 179\1\ img128 | |
| Date | 28th November 1931 | |
| To. RG.{Mr Rowledge} } FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} } C H Parkinson R9/M28.11.31. Sent off 30.11.31 C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} COMPRESSION IGNITION ENGINES. XU 33. It was realised that we had made very little progress recently, also that Farnboro' had made very little progress for some time with a plain 4 cycle engine with solid injection, fine spray nozzle, and I mentioned the following sequence of ideas: That if we cannot get high speed, high mean pressure, and a robust engine, from the present scheme, we must try something different. Apparently supercharging alone would not make the difference and Mr. Ricardo told us that we cannot get away from the fine injection without using the swirl, which means port inlets, so it will be realised that we are driven to either: (1) A 4 cycle sleeve engine. (2) Or a 2 cycle engine with a combination of piston intake and valve exhaust. (3) Or double piston engine. (4) Or single sleeve 2 cycle. Since Mr. Ricardo himself is working on (4) it looks as though it would be a definite advantage for us to be allowed to make a model cyl. of either (2) or (3). This we hope will be decided whenever we meet Mr. Pye and Mr. Tweedie. HS.{Lord Ernest Hives - Chair} informs me that RG.{Mr Rowledge} favours the double piston - (3) - (Junkers type) but as this has certain limitations in the combustion chamber shape and position of the injection I am not sure that it would prove the best move. It is however definitely worth careful attention provided the piston used for the exhaust is not liable to overheat and gum. I pointed out to HS.{Lord Ernest Hives - Chair} certain advantageous features we had found possible on the Junkers type of engine and we believe that this would make both a light and smooth running engine, if it develops no insurmountable characteristics. As the situation stands it would be easier for us to combine a piston intake and valve exhaust, 2 cycle arrangement, than any other owing to the fact that we have no unit suitable for double piston work. These are points for consideration at, and before, the proposed meeting, and on Wednesday I have arranged to see Mr.Ricardo at his Works at Shoreham on this subject. R.{Sir Henry Royce} | ||