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).
Tests and modifications to a boiler and vaporiser system to resolve cold starting and fuel mixture issues.
| Identifier | Morton\M22\ img162 | |
| Date | 10th October 1922 guessed | |
| Contd. -4- boiler, but there is no doubt it did so, because we fixed a bottle in the vent pipe and collected the petrol which was travelling from the boiler into the induction pipe. We practically overcame missing fire caused by this condition by fitting restriction having only 1/16" hole in the vent pipe. We have tried vapouriser scheme made to drawings supplied by Springfield - we found that these had the same limitations as we have already stated. The Springfield scheme provides for big capacity boilers. Their argument is that when starting up cold they are necessary. We think this is very probable, as they are using a pilot jet which is not adjustable and is always set to give ample strength under the most severe conditions; also as they have no exhaust heated throttle, it will be necessary for this pilot jet to be left working for a considerable time. The boilers we have been using were arranged to obtain the maximum heating surface with a small capacity, but this did not prevent us getting liquid petrol through it. All our tests show that by far the worst time for collecting liquid petrol is when the engine is started up cold. Under that condition one has the main carburetter mixture control set strong, and in addition one has a pilot jet which must be adjusted to give a very strong mixture. With exhaust heated throttle, we find that the pilot jet never need be in operation more than a minute. Contd. | ||