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).
Modifications and performance targets for the Phantom induction pipes and engine components.
| Identifier | ExFiles\Box 66a\2\ scan0136 | |
| Date | 30th August 1926 | |
| To Hs{Lord Ernest Hives - Chair}/ACL. from R.{Sir Henry Royce} c. to BJ. RG.{Mr Rowledge} X8070 R1/M30.8.26. PHANTOM INDUCTION PIPES ETC. X. 8070 X. 8050 X. 8080 We are very pleased with the progress you are making. Cold distribution is in all our engines extremely important. We think that an increased area of the slot into the manifold should be tried. It is very possible that it would be an advantage to even lengthen the 6" say 25%, and put up the width 25%, and also heat should be added so as to compare the pipes for power when heated. The investigations should be continued to find out how it is the MEP. is so low at all speeds in this engine. We had hoped from aero engine results to have obtained 100 MEP. at 2500 r.p.m., and correspondingly greater MEP. at slower speed, rising to a max. of say 125 at about 1500 r.p.m., with about 4.5 compression ratio. In all cases Claudel and our own carburetters should be compared, and also grouping in three as well as six, for instance, the slot entrance to the induction pipe grouped in three, with two carburetters of smaller size might be passably convenient, both Claudel and RR. type. The compression ratio might be increased but this we should do in conjunction with the alum. cyl. and head. The system of construction of liner and inserted valve seats has promised to be satisfactory in E.16. It is now to find whether the improved shape of the head and turbulence are advantages, and we would also like to know if there is any hope of getting any more power by altering the cams to the most recent form adopted for F.10. where the overlap is increased by making the exhaust cam longer, the angle between the cams being 108º. Confirm by getting a hot water jacketed pipe on the road: it may give better consumption also. Simple ordinary hot water should be all that is needed for so good a pipe. R.{Sir Henry Royce} | ||