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).
Tests of Weir type induction pipes for the Lighter Phantom engine.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan185 | |
| Date | 20th February 1928 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to EY. CY. ORIGINAL. Hs{Lord Ernest Hives - Chair}/ACL1/LG20.2.28. TESTS OF WEIR TYPE INDUCTION PIPES +8070 FOR LIGHTER PHANTOM. Two types of induction pipe were tested :- Sch.965. Horizontal portion of induction pipe and fishtail cast in one piece (with and without nozzle in fishtail). Separate hot spot pipe giving a carb. position of 4.5" (approx.) higher than standard. Sch.980. Horizontal portion of induction pipe and fishtail bolted together (nozzle may be fitted in fishtail). Separate hot spot pipe giving a carb. position of 4.5" (approx.) higher than standard. Conditions of test. Lighter Phantom engine No. AU.25 - compression ratio 4.63 - anti-detonating head - standard camshaft - standard test bed exhaust system - standard carb. (except Test.E.) SUMMARY. (a) For standard carburetter, the best results are obtained with the one piece pipe and fishtail (Sch.965). (b) The presence of a nozzle in the fishtail tends to flatten the peak of the power curve, but to increase low speed torque. (c) When using the vertical Claudel Hobson carb. the taper nozzle is very important, the distribution being very dependent on it. (d) The longer the hot spot pipe the less apparent is the influence of the nozzle. (e) On all the systems tested, the action of the hotspot made no material difference to the power output. contd :- | ||