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).
Letter from Autovac Mnfg. Co. Limited discussing the performance of a Venturi with a Non Return Valve.
| Identifier | ExFiles\Box 40\4\ Scan034 | |
| Date | 22th August 1921 guessed | |
| - 2 - The Venturi fitted with Non Return Valve and coupled up to the exhaust pipe --- the vacuum on the apparatus when working shewed 4" and 6" static. The petrol was lifting 3'8" through 12ft tubing and delivered at the rate of 9 galls. per hour, also 5'6" through 12 ft of tubing and delivered 6 galls per hour. The loss of power through passing the exhaust gas into the induction pipe was hardly perceptible. We have had one of these fitments upon a car for 4 months and have traced no ill effect upon same. Enclosed is blueprint showing assembly of same. We remain, Yours faithfully, FOR AUTOVAC MNFG. CO. LIMITED. S.Royle. Manager. | ||