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).
Carburation improvements and performance results for the Goshawk I engine.
| Identifier | ExFiles\Box 32\5\ Scan157 | |
| Date | 31th May 1921 | |
| X1697 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}1/LG31.5.21. X.3481 X.1692 RE. GOSHAWK 1. X.4305. Attached herewith is a Curve shewing the latest horse power taken on Goshawk 1 both on the Test Bench and Dynamometer. On this curve we also give a comparison of the M.E.P. obtained on the Goshawk, Marmon and 40/50 chassis. We have compared it with the Marmon car because this car has given the best M.E.P. of any car we have tested so far. We have greatly improved the carburation on the little Goshawk. We have made up a R-R Carburetter with a butterfly valve and smaller air valve. We have made a new induction pipe using a pipe 1.5" diameter instead of 1.625" as we have used before. We have arranged a real effective hot-spot close up to the carburetter. We can appreciate on this engine a very great improvement with the hot-spot in operation. It is possible to maintain a steady and even torque at 300 R.P.M. full throttle. Improving the carburation has made a great difference to the car on the road. On hills which it would not climb on top gear, it now climbs easily. The improvement in torque at low speeds, however, has made the pulsations of the engine very much more manifest. Previously, if the throttle was open fully at low speeds, the engine felt smooth and the picking-up was without much vibration, now, however, the vibration is quite marked. contd:- | ||