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).
Preliminary cold distribution tests conducted on Weir type induction pipes for the Phantom model.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan099 | |
| Date | 3rd January 1928 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} OY. ORIGINAL Hs{Lord Ernest Hives - Chair}/ACL1/LGL3.1.28. WEIR TYPE INDUCTION PIPES ON PHANTOM AND GENERAL DISTRIBUTION. X8070 We have carried out some preliminary cold distribution tests on the kk lighter Phantom with the two weir type induction pipes using the std. chassis carburetter and obtained some promising results. As far as these bench tests go both schemes are an improvement over the standard system giving steadier torque under wide open throttle at low speeds without hot spot heating. The built-up weir pipe however gave slightly inferior results to the single cast weir pipe. Both pipes give a very slight increase in power output over the whole range but this only amounted to one and a half per cent. The distribution tendency with both these pipes using the standard carburetter was for the end cylinders - Nos. 1 and 6 - to be rich while the centre cylinders appeared weak. This however was not so marked as with the standard system. The built up weir pipe was tested with and without the washer which formed the projecting lip inside the main distributing pipe and it was found that this lip improved the distribution. The built up weir pipe had a short bend connecting the carburetter with the distributing pipe and it was proved that by substituting this for the longer bend belonging contd g- Projecting lip improves distribution. | ||