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).
The operation of the carburetter system, focusing on exhaust and water heating during startup.
| Identifier | ExFiles\Box 66\2\ scan0120 | |
| Date | 23th November 1925 guessed | |
| -2- connection from the exhaust to this latter jacket, and, if necessary, a valve in the main exhaust for choking purposes would be inter-connected with the starter carburetter control, so that the first action in operating this control would be to place the valve, or valves, in the position by which the exhaust would be driven through the carburetter jacket, a further movement of the control putting the starter carburetter into operation. On starting up the car as at present, the starter carburetter would be turned off immediately the main carburetter would operate, but the control would only be half-closed, thus leaving the exhaust heating on until some rise of water temperature is clearly indicated on the thermometer, when the control would be fully closed, completely cutting off the exhaust heating from the carburetter, and thereafter leaving the water heating to provide the whole of the heat required. It is felt that in the case of the water heating, without some such device, it will take very considerably longer to get the car underway and to warm it up to a condition where it will function properly without a lot of popping in the carburetter, etc. To get it underway it will require probably a period of three to four minutes running on the starter carburetter, instead of 20 to 30 seconds as usually obtain at the present; thus, adding considerably to the chances of serious dilution of lubricating oil and in particular, of washing this oil off the cylinder bores during this period. (Sgd.) CWB. | ||