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 to the Zenith Carburettor Co. Ltd. proposing an altered carburettor position to cure engine flooding on gradients.
| Identifier | ExFiles\Box 122\2\ scan0292 | |
| Date | 7th December 1937 | |
| 1033 Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}8/JH. 7th December, 1937. The Zenith Carburettor Co.Ltd., Honeypot Lane, Stanmore, Middlesex. For the attention of Mr.A.E.Palmer. Dear Sirs, 30 H.P. D.C.42. With reference to our modification, Rm.{William Robotham - Chief Engineer}467, will you kindly see that your experience on the E.E.C.42 is applied i.e. we find it essential that the idle metering screw is concentric for correct control and that it may be necessary to spot face the body, as on the E.E.C.42, to keep the spring square. The writer is proposing the alter the position of the above carburettor on the engine, i.e. the floatchamber being in line with the engine, float to the front and needle at the rear. The main idea being to cure flooding on gradients. Preliminary tests show no appreciable difference in straight forward acceleration or on right and left hand turns, the latter tests having been carried out on our skid pan. With regard to gradients, this position is clear from flooding both up and down on a maximum of 1 in 4. At the moment we are awaiting bench test results on the effect of part throttle distribution, as the throttle butterfly is at a right angle to the induction pipe having little or no riser between. We enclose sketch Rm.{William Robotham - Chief Engineer}473 of the proposed position and would welcome your comments. Will you kindly let the writer know if you have any objection at all to this position of the D.C.42 on the 30 H.P. | ||