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 C. T. Weymann regarding the supply and fitting instructions for their 'Exhauster' device, including details of a new venturi tube modification.
| Identifier | ExFiles\Box 40\3\ Scan017 | |
| Date | 13th April 1922 | |
| Copy C. T. WEYMANN, 20, Rue Troyon, Paris. Paris, 13th April, 1922. In answer to your letter of the 5th inst, we hasten to send you the "Exhausters"which you have ordered. Should you have any difficulty in fixing these, we should be obliged if you will kindly apply to Mr.Lenoir, Rotax Works, who will place himself at your disposal on our behalf, and will give you any information you may need. Mr.Lenoir will also bring to your notice our new device which permits of the reservoir of the "Exhauster" being almost entirely suppressed. As you know, a reservoir of a capacity of 1-2 litres must be fitted around the "Exhauster" in order that when the engine is running slowly and at full admission, the depression is insufficient to assure the regular working of the "Exhauster". This is obviated by placing a small venturi tube in the induction pipe, this tube is fixed on a flange, the incoming gas passing through it continually, instead of acting directly on the induction, acts through the venturi. In this way the "depression" is considerably increased without affecting the running of the car, as you will readily see when testing this. This device enables the capacity of the reservoir to be reduced to 200 cms. The following firms use our apparatus with this device:- Excelsior. Lancia. Minerva. Ballot. (Racing cars) Mr.Lenoir will confirm all this. C. T. WEYMANN. | ||