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).
Experiments to determine the reason for explosions in the silencer on the Phantom model.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan048 | |
| Date | 13th August 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c.c. to EJ. Wor.{Arthur Wormald - General Works Manager} c.c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c.c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c.c. to OY. ORIGINAL hs{Lord Ernest Hives - Chair}/ACL1/LG13.8.26. X8230 X930 X8080 EXPLOSIONS IN SILENCER ON PHANTOM. We have carried out some experiments with the object of determining the reason for explosions in the silencer on the Phantom. There are three distinct forms of the trouble which may be put in the following order of importance :- (1) Coasting down a hill - or on the level - with the throttle not quite shut at certain speeds and throttle openings the explosions become very severe and frequent. (2) Coasting with the throttle shut and obtaining explosions as the throttle is opened again before the engine starts to drive the car. (3) Closing the throttle when coasting when an explosion takes place after the throttle is shut, but usually not more than one or two. Another case occurring in practice is that of coasting with an apparently closed throttle and obtaining continuous explosions as in case (1). Experiments shew us that if this happens then the throttle does not shut correctly. In order to reproduce as near as possible, on the Phantom test engine, the conditions encountered on the road - we fitted it up so that it could be driven at any speed by means of a belt from another engine and at the same time operate under its own power at any required throttle opening. contd :- | ||