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).
Carburetter heating, comparing the advantages and disadvantages of reverting to a water-heated throttle system.
| Identifier | ExFiles\Box 66a\1\ scan0051 | |
| Date | 1st May 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 48080 REF: HS{Lord Ernest Hives - Chair}2/LGL.5.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to C.J. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} RE: CARBURTTER HEATING. X8080 X766 X2768 The advantages we can see from reverting to the water heated throttle is that we get rid of the choke valve in the exhaust pipe which is liable to stick open and so allows very little heat to the carburetter, and it is liable to either squeak or rattle. We cannot say that it is going to make any difference to the over-heating problem. We shall lose also the advantages of exhaust heating. (1) Starting up from cold. Unfortunately quite a lot of people never experience starting up a car from dead-cold and take it on the road - they receive it in a warmed-up condition. With the water-heated throttle it is impossible to get the car under way for a period of time. If it is attempted the engine will pop, splutter and stop. To avoid this the usual practice is to leave the starter carburetter working. This is the worst possible thing to happen because raw petrol is poured into the cylinders. We agree that we would like the minimum amount of heat to the carburetter but as we shall not overcome the over-heating troubles by this move, we strongly recommend caution before we change cars wholesale. The distribution on the 40/50 car, until the carbur-etter is warm, is poor. contd :- | ||