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. Company regarding carburetter slow running issues and non-standard pistons for the 3.5 litre Bentley.
| Identifier | ExFiles\Box 121\4\ scan0088 | |
| Date | 2nd December 1935 | |
| STATION: ADDERLEY PARK, L.M.& S. RLY S.U. CARBURETTER FLEXIBLE SILENT THE S.U. COMPANY. PROPRIETORS: MORRIS INDUSTRIES LTD TELEPHONE NO EAST 1171 (6 LINES) East Works, Bordesley Green Road. Adderley Park-Birmingham, 8. General Manager: T. C. SKINNER. TELEGRAMS:- FLEXCARBUR, BIRMINGHAM. Your Ref. ............ Our Ref. BC/NK. 2nd December 1935. Messrs. Rolls-Royce Limited. D E R B Y. Dear Sirs, For the attention of Mr. Bowering. As you probably know, to obtain the best slow running on the present pair of 1 3/8 carburetters on the 3.5 litre Bentley, we found it necessary after quite a number of tests, to fit special non-standard suction pistons having a very much smaller clearance round the small diameter, and also a special depth of recess in the bottom of the piston. On the 12 pairs of 1 3/8" carburetters, for which we have just received your order, we think that it is quite possible that again it will be necessary to fit a non-standard piston, and naturally we should like this settled before supplying these 12 pairs. The previous three or four sets of 1 3/8" carburetters which you had in September or October were fitted with a standard brass piston having the standard clearance and recess, and it is of course possible that you may obtain the best slow running with the standard piston. We are sending to you under separate cover one pair of special pistons which are similar to the previously supplied standard type, differing only -1- | ||