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).
Advantages of the adjusting needle for the pilot jet on the Goshawk carburetter.
| Identifier | ExFiles\Box 5\4\ 04-page052 | |
| Date | 29th June 1922 | |
| To E.{Mr Elliott - Chief Engineer} From Hs.{Lord Ernest Hives - Chair} c.c. to CJ. c.c. to De. c.c. to BY.{R.W. Bailey - Chief Engineer} c.c. to EF. X4228 Hs{Lord Ernest Hives - Chair}3/LG29.6.22. GOSHAWK - CARBURETTER. X4228 Referring to your memo. El/MED.6.22. We have found that there is a definite advantage in having the adjusting needle for the pilot jet with the largest diameter so that it will not pass through the jet. This is similar to the low speed jet on the 40/50 H.P. and Goshawk and the pilot jet on the 40/50 H.P. The advantage is that one can always find the right adjustment. In the case of the 40/50, we can practically guarantee to adjust the low speed jet correctly to a mechanical setting. This adjustment is that with the cone just resting on the jet, the milled nut is then turned 35 minutes. If it is found that the car will not run on this mechanical setting, it generally proves that there is some other fault - such as - leaking induction pipe etc. In the case of the starter carburetter, we think this is a very big advantage. If a driver has difficulty in starting his engine, it is very nice to be able to check that the adjustment of the pilot jet is correct, if it is altered, one can always find the same position again, if there is a stop to work from. Hs.{Lord Ernest Hives - Chair} | ||