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).
Continued report on carburettor modifications, discussing mixture distribution, throttle response, and material changes for weight saving.
| Identifier | ExFiles\Box 20\9\ Scan075 | |
| Date | 7th January 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Swd1.4/MA.7.1.36. Cont'd.{John DeLooze - Company Secretary} Although we wish to confirm these figures, we do think that the above modifications would be worth while, if only for an experimental try out. The distribution at high speeds is almost identical in both schemes, the rear cylinders tending to be slightly weak. This result is reversed if the carburetter be turned round which we have found is not confined to the air intake bend, but partly due to the position of the discharge from the accelerator pump jets, relative to the choke. Both systems have the same failing in that, if the throttle be shut quickly from low speeds full power, there is a momentary richness. Full throttle distribution is good if the mixture be the weakest maintained for maximum power, but a feature of the carburetter is that with a normal mixture strength at high speeds the mixture is rich at low speeds full throttle. The hot spot box which we instructed in brass to enable the fitting of a jacket round the riser portion weighs 13 lbs. According to the LeC. this is called for in cast iron and we should like to know if it can be made in alum as it would be an appreciable saving in weight. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||