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).
Trial and function of a Stewart-Warner 'Booster' and vacuum pump for fuel feed systems.
| Identifier | ExFiles\Box 40\3\ Scan076 | |
| Date | 25th June 1928 | |
| X 3575 OY9.R.6.25.28 June 25th, 1928. TO: Mr. Ainsworth Mr. Knapton Mr. Nadin (England) cc - Mr. Ross Mr. Hives(England) Mr. Darling Mr. Soutter FROM: Mr. Olley RE FUEL FEED - SECTION 7140 Stewart-Warner 'Booster' and Vacuum Pump. We shall shortly receive 6 Stewart Warner 'Boosters' and one Stewart Warner vacuum pump both for use with Stewart Warner (or 'Autovac') vacuum feed systems. Both of these are devices to increase the vacuum at the tank under full-throttle running conditions. BOOSTER. The first is in the form of a constant air leak into the intake pipe, and requires adjustment of the carburetter for low speeds. The fitting is mounted at the center of the intake manifold, and the tank connection is made to the booster instead of to the pipe direct. The restriction-nipple at the tank must be removed. The fitting consists of a small 'scent-spray' injector (with two carefully made venturi-nozzles) causing increased suction at the tank by virtue of taking in more air than is normally taken by the vacuum feed. Since however the mixture taken into the manifold during operation of the tank is not over-rich, the effect is rather to speed up the engine than to cause it to choke. We should try this on 364-FM and MX{John H Maddocks - Chief Proving Officer}-3 and also find its effect at full throttle and low speeds on the glass tank on dynamometer. If successfully five of the six boosters should be given to B.W.A for use in cases of failure of the feed in service. One should remain on MX{John H Maddocks - Chief Proving Officer}-3 for prolonged test. (Continued) | ||