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).
Mr. Royce's proposals for modifications to the water-heated throttle system.
| Identifier | ExFiles\Box 66\2\ scan0192 | |
| Date | 12th June 1926 | |
| To Hs. {Lord Ernest Hives - Chair} from E. {Mr Elliott - Chief Engineer} c. to BJ. 48230 E1/M12.6.26. WATER HEATED THROTTLE. X. 8230 X. 8060 Further to memo. R1/M11.6.26., Mr. Royce would like you to try an inner extension on the present jacket connection with the exhaust branch which twists round and faces in towards the gas bend on the cyl. head so that this extension pipe receives direct puffs from the gas stream given off by No.4. cyl. Also to avoid overheating at full throttle Mr. Royce proposes transferring the exhaust butterfly valve to one of the jacket pipes, so that coupled to the accelerator pedal it can be used to shut off or moderate the supply of heat to the jacket, and at the same time should no longer be a source of trouble since it will be working under entirely different conditions. Its dimensions should of course be modified to suit the 3/4" dia. jacket pipes at present in use. When the engine is doing its max. power there should be no flow or very little flow pass this valve, and it should remain quite cool. Personally I am of the opinion that we shall not get sufficient heat, or sufficiently quick warming up, with these induced flow exhaust heated jackets unless we increase the size of the jacket pipes, but Mr. Royce is very averse to using larger pipes until we have tried every possible means to get sufficient heat conveyed with the existing pipes. E. {Mr Elliott - Chief Engineer} | ||