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).
Design choices for the India 3 engine, focusing on the cylinder head, induction system, and carburettor.
| Identifier | WestWitteringFiles\R\January1928-March1928\ 146 | |
| Date | 21th March 1928 | |
| ORIGINAL R.{Sir Henry Royce} } FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} } (At Le CanadelHenry Royce's French residence.) BY.{R.W. Bailey - Chief Engineer} } REC'D, & DESPATCHED FROM WW. 24.3.28. R1/M21.3.28. C - to BJ, WOR{Arthur Wormald - General Works Manager}, RG{Mr Rowledge}, FL. INDIA 3. ENGINE. Y5770 X5080 Y5050 YJ070 You send me quite a lot of good schemes to choose from. Though this is very urgent we must have the very best scheme, because it will be the least expensive in the end, and because we hope the alterations will last a long time. Valves must be 1.350 inlet, 1.250 exhaust. Head - ("SS{S. Smith}") EAC.10. pattern. I do not think we should make any part of the induction system integral with cylinder block, and we should make the head as simple and light as possible. This appears to me to give us LeC. 2531. and 2530., whichever test shews the better. I hope it will be LeC.2531., because there is less of it. Try with slot 4" long because the 6" you shew does not make a good shape (this is the underfed type.) I have the impression that for cold distribution Derby prefer top fed weir type. Distribution is more important than last fraction of high speed power. I hope and expect that we shall soon get a straight through upright carburetter which will go well on LeC. 2530. I have all the parts fairly practical, and a working drawing is needed. I am very sorry but are you sure we cannot use box key for head studs with LeC. 2531. and 2530., when the induction pipe is off, and if not, are there no slight modifications - small deep nuts for instance, or studs rather further apart, or joint slightly nearer centre by valve moved slightly over - here and there, until this is possible? R.{Sir Henry Royce} | ||