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).
Notes on carburetter adjustment, mixture control, and fuel distribution issues.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan192 | |
| Date | 29th January 1925 | |
| contd :- -7- to the use of the mixture control - which is intended for use in this respect as well as a compensation for atmospheric temp. variations - in order to maintain proportionality. The air valve has been made of large diameter and light weight in order to obtain early lift and thereby get a wide range, but unless it is working freely and the diaphragm adjusted to obviate loss of movement before effectively opening the diaphragm ports, full advantage of the design is not obtained. A previous report (Hs{Lord Ernest Hives - Chair}/ACL/LG29.1.25) has been furnished dealing with the adjustment of the carburetter but the following are a few additional notes. Before any adjustment is made to the carburetter it should be ascertained that the engine is correct in other respects. The ignition should be set to operate correctly, the sparking plugs in perfect working order and the valves must seat firmly - particular notice being taken of the inlet valves - also the induction system should be free from leaks. It is absolutely useless to adjust the carburetter if any of these other factors are at fault. DISTRIBUTION AND FUELS. Uneven distribution- which could be caused by a poor grade of petrol or a cold hot-spot - could give rise to symptoms which might be mistaken for faulty metering of the carburetter and although correct metering tends to promote good distribution it will not correct an induction system which is at fault. To guard against this contd :- | ||