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).
Carburetor testing, comparing Zenith and Stromberg models and discussing road test results on a Phantom.
| Identifier | ExFiles\Box 5\4\ 04-page246 | |
| Date | 1st June 1932 | |
| -3- HS{Lord Ernest Hives - Chair}/ACL.1/BLL.6.32.Contd. Zenith 140 miles was done with the accelerating pump and 140 without and a careful check made of the fuel consumption. No difference could be detected in either case. We think the injection for accelerating should have its action continued for a short time after the throttle is snapped open to follow the acceleration of the engine. In the Zenith this is obtained by raising the fuel above the injection jet which continues to discharge until the fuel has fallen to the jet level. see appended print. The latest Stromberg aero carburetter has a spring loaded plunger which continues its injection for a short period, under the action of the spring after the throttle has been snapped open. We will try to get a picture of their scheme and forward it on. The question of pressure balance is naturally not so important as in aero carburetters but it will be remembered we had some erratic affects on the expanding Tulip type carburetter on Phantom due to the draught from the fan into the air intake when tested on the road. We are continuing road tests on the Twin Zenith and when we have improved the metering, will forward a report of the performance. HS{Lord Ernest Hives - Chair}/ACL. | ||