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 a non-return valve in the 'Phantom' vacuum feed system to reduce engine fading.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan49 | |
| Date | 3rd October 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF Hs{Lord Ernest Hives - Chair}/AJL/LGL3.10.25. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL c. to C.J. B.J. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} ORIGINAL 'PHANTOM' VACUUM FEED. X8510 X5579 We have carried out the tests suggested in DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}1/M28.9.25 in which a non-return valve was placed between the petrol tank and the autovac, in an attempt to diminish or eliminate the fading effect noticeable in the engine when the autovac functions. It was previously found that this is due to the induction pipe mixture becoming richened up every time the autovac is exhausted of air. It was thought that by placing a non-return valve in the petrol supply pipe, the failing might be remedied to some extent, owing to the fact that the pipe would not have to be fitted up with petrol every time the autovac functioned, and so reduce the quantity of carburetted air sucked into the induction pipe. The tests show however that no advantage can be gained in this respect if a non-return valve be employed. The best means we have so far of reducing the effect of the autovac on the running of the engine, is the valve supplied by The Autovac Co. which partially cuts off the autovac when the engine is idling. Hs{Lord Ernest Hives - Chair}/AJL. | ||