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).
Letter discussing the design and operation of a pilot jet for starting the car, particularly in cold conditions.
| Identifier | ExFiles\Box 74\2\ scan0067 | |
| Date | 4th July 1922 | |
| X4387 Expl: Office, Rolls-Royce Ltd., Derby. England. X4387 / X4390 4th. July 1922. OY. from Hs.{Lord Ernest Hives - Chair} I was pleased to hear that your Service Inspector liked the appearance of 49-SG{Arthur F. Sidgreaves - MD} and had no complaints as regards the running of the car. I think that you will find the pilot jet and the control for the pilot jet is much neater than the drawings I have seen of your scheme. An arrangement you sent to me show'd a tap which was intended to be operated by the foot. We should not imagine that that would be a very good permanent scheme. It does not appear right for the driver to have to scuffle round the passengers feet in order to start the car. In cases where cars are used in exceptionally cold districts, we would recommend that the customer is advised, if there is any trouble with starting, to use the pilot jet in connection with a lighter spirit. We think that we have an advantage in the fact that the pilot jet is an entirely separate carburetter and can be connected up to any independent fuel supplied. I have noticed in some of the S.A.E. Journals that some of the American Engineers have advocated starting up on a light fuel. I believe, on the parts we have sent out for the exhaust heated throttle, we have not shown the method of running the pipe from the pilot jet to the float chamber. We do not run it on the top of the induction pipe similar to the primer, but we | ||