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).
Carburettor tests concerning petrol flow, needle valve, and return spring mechanisms.
| Identifier | ExFiles\Box 93\2\ scan0106 | |
| Date | 8th October 1935 | |
| -2- HS{Lord Ernest Hives - Chair}/Swd1.5/KW.8.10.35. Working under 2 lbs/sq.in. petrol pressure, we find that .025" needle movement gives a flow of 60 pts/hr. which is slightly in excess of what is required, and .015" movement gives a supply of 30 pts/hr. The needle valve should be capable of flowing in excess of 60 pts/hr. to be on the safe side. Tests have been carried out with the jet return spring and we find that providing there is no binding in the mechanism, a 3 lbs. spring in place of the original 5 lbs. return spring is sufficient to lift the piston to normal and return the mechanism after richening up. These tests were carried out on single carburetters. Various faults which can occur in the action of the rack and pinion operation of the mixture control have been demonstrated to E/FSN, who is dealing with the job. HS{Lord Ernest Hives - Chair}/L.H.Swindall. | ||