Modifications for the Phoenix combustion chamber high power head.
| Identifier | ExFiles\Box 111\2\ scan0237 | |
| Date | 31th August 1937 | |
| SECRET. 10HH. also 1129. HPS. {Horace Percy Smith - Experimental Factory Mgr} from Rm {William Robotham - Chief Engineer} /Ed. {J. L. Edwards} 800 Rm {William Robotham - Chief Engineer} /Ed {J. L. Edwards} 9/R.31.8.37. PHOENIX COMBUSTION CHAMBER. We send you herewith a sketch showing various modifications to the single cylinder high power head, LeC.5368, necessary to adopt it to the O.H.I. Phoenix, and we should be glad if you would have one head made as soon as possible, as it is urgently required. The main points are:- (1) Valve inclination considerably reduced, making necessary (a) shorter rocker, and moving rocker centre towards exhaust side of engine. (b) push rod inclination decreased. (c) modification to cores for inlet ports and rocker box. (2) Plug inclined approximately as shown, and exhaust plug omitted. (3) The throat area to be kept approximately the same as before, and not in any case to be less than 1.50.sq.in. (4) C.R. to be adjusted to give 6.4 with a .062" C. & A. {Mr Adams} gasket. It is recommended also, that along with the new head, a complete set of details, such as studs, etc. be put through to save the trouble and time Rm {William Robotham - Chief Engineer} /Ed. {J. L. Edwards} | ||
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).