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).
Experiments to improve petrol consumption by heating the throttle and carburetter.
| Identifier | WestWitteringFiles\N\October1925-December1925\ Scan115 | |
| Date | 25th November 1925 | |
| R.R. 235A (100 T) (S.H. 159. 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 ORIGINAL. TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} Copy to GJ. " DJ. R4/M25.11.25. PETROL CONSUMPTION. X459/X8080 X8230 Please thank Mr. Rowbotham for his very able and complete report on petrol consumption. It had been worrying me that we were gradually using more and more petrol. His explanation is quite satisfactory. We shall be glad if you can arrange to make experiments with the temperature of the throttle. I have suggested to E.{Mr Elliott - Chief Engineer} that we take the hottest water we can from the cyl. and pass it through a superheater on the exhaust pipe on its way to the throttle bend. If we could add enough temperature to get it up to boiling point we think it would be more satisfactory than the exhaust heating, for various reasons. It will be noticed probably that the added heat to the water will be taken out by the ingoing carburated air. Another investigation you can make is to feed the carburetter with warm air from a heater on the exhaust pipe. This could be detachable in summer time. It will be interesting to see whether the extra heat to the throttle bend is better than extra heat to the air entering the carburetter. Probably for a given rise of temperature it would be difficult to see the difference. In these experiments thermometers should be inserted in the various parts of the induction system. R.{Sir Henry Royce} | ||