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).
Cold weather engine starting issues, proposing a pilot jet for new chassis and other remedies for existing cars.
| Identifier | ExFiles\Box 31\3\ Scan004 | |
| Date | 6th November 1914 | |
| COPY. COPY. To J.{Mr Johnson W.M.} from R.{Sir Henry Royce} Copy to EP.{G. Eric Platford - Chief Quality Engineer} Copy to WDR. for Mr Hives. 9/11/14 Copy to Na.{Mr Nadin} R16/IB61114. November 6th. 1914. With reference to the easy starting of our engines in cold weather, Mr Ionides, of course, can work on this if we think any good will come of it, but we are putting in quite another arrangement for our new chassis in the form of a very small pilot jet which, in effect, will use the engine as a priming pump. We have tested this and find it very successful. In our existing cars it is difficult to make any very serious alteration for the number we have to complete. Certainly the best thing we have tested is the use of the small cock on the top of the suction chamber of the extra air valve. This seems to be most successful in preventing the engine from stopping after the usual induction pipe priming has been performed. A fault, however, that I think very often occurs, which is nothing to do with the carburation, is that when the engine is cold and the valve stems are at all sticky from cylinder oil being deposited upon them, they often hold up somewhat until the engine gets warm, causing a failure after firing one or two cylinders. The quickest and safest way of dealing with this trouble is to take out the plugs over the exhaust valves, and while the engine is cold turn it round slowly and pour a little paraffin on the top of each [Handwritten on left margin]: 1449 | ||