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 with a venturi suction drain to remove petrol accumulation in supercharged engine volutes.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan068 | |
| Date | 23th January 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/ACL (Held up). c. to SB.{Mr Bull/Mr Bannister} c. to RC.{R. Childs} c. to WH. ORIGINAL SUPERCHARGED ENGINES - SUCTION DRAINING OF THE VOLUTE. X 4550, X 4459. Experiments have been made with the venturi suction drain for the volute and tests shew that this method promises to be a successful method of getting rid of petrol accumulation in the volute during the warming up period. The principle of the scheme is the same as the 'Vacuum Booster' used with the Stewart-Warner Autovac. It consists of a very small venturi one end connected with the induction pipe and the other open to atmosphere. At the minimum section of the venturi a lead is taken to the bottom of the volute. With a correctly proportioned venturi, the suction exerted at the min. choke section is higher than in the induction pipe, hence it is possible to lift accumulated fuel from the base of the volute to the induction manifold. We have had this operating on an engine on the hangar and although these tests have not proceeded far, the results look promising. At the same time we are making some tests using a Phantom engine to supply the induction pipe depression. This is a convenient method of developing this apparatus. So far with a small venturi having a min. diam. of only .062 we are able to register a suction of 6 ins. Hg. more than the induction pipe depression. This is a static reading - | ||