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 The S.U. Carburetter Co. Ltd. responding to issues with a thermostatic carburettor.
| Identifier | ExFiles\Box 121\4\ scan0239 | |
| Date | 29th November 1938 | |
| TELEPHONE: BIRMINGHAM EAST 1171. TELEGRAMS: FLEXCARBUR, BIRMINGHAM. THE S.U. CARBURETTER CO. LTD. PROPRIETORS:- MORRIS MOTORS LTD. VISCOUNT NUFFIELD, CHAIRMAN. OLIVER BODEN, O.B.E. VICE-CHAIRMAN. T.C. SKINNER, M.I.A.E. MANAGING DIRECTOR ADDERLEY PARK, BIRMINGHAM, 8. YOUR REF: Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation} 5/JH. OUR REF: BC/HJ. 1487. 29th November/1938. Messrs. Rolls-Royce Ltd., DERBY. For the attention of Mr. Salt, Car Experimental Dept. File Dear Sirs, Replying to yours of the 28th inst., describing trouble experienced with the Thermostatic Carburetter, regarding the sticking needle under severe frost conditions, this is probably due to ice forming around the suction disc - in service this generally happens only when the car is left idling for a fairly protracted period and not when driven - therefore, we recommend that at these severe temperatures the car should not be left turning over when the thermostatic carburetter is in action. Regarding the trouble with the main jet adjustment, this is very illusive and candidly we have not been able with any certainty to pin down the cause on the occasional troublesome unit. We have a positive "push-pull" assembly in the experimental stage, but so far nothing has been decided about it. However, if you are chary of adopting the present main jet assembly there is no reason why you should not use what we call the Invicta type adjustable jet - blue print assembly herewith marked in red - this is also a push-pull. Yours faithfully, for THE S.U. CARBURETTER CO. LTD. B. Cooper | ||