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 S.U. Carburetter Co. regarding pump endurance testing, wear analysis, and enclosing oscillogram prints.
| Identifier | ExFiles\Box 149\3\ scan0027 | |
| Date | 18th February 1939 | |
| 1263. Experimental Dept. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}1/BA. 18th,February.1939. S.U.Carburetter Co. Adderly Park, Birmingham. For the attention of Mr.Leslie Kent. Dear Sir, We thank you for your letter and note your remarks with interest. The contact plate referred to in my last letter was .022" thick and the area of contact about .588 sq inches. There was no evidence of welding and all the wear seemed to be due to arcing and abrasion. We would be willing to run one of these pumps on endurance as soon as you have a sample to spare, and could arrange to send it to you for examination afterwards. We enclose a print of the oscillograms of current and voltage of the high pressure pumps as promised, which are more or less self explanatory.(A) shews the cast iron H.P. pump with and without the additional resistance for quantity and (B) the present production H.P. pump with the steel coil housing. The current values are not really comparable as the speed of the pump did not remain constant, and it was necessary to alter the time base to synchronize. However, they do give a fair idea of the conditions at the points at the end of the stroke,and in actual working conditions with petrol the current value is probably higher and also the induced voltage. It was only possible to make the pump run sufficiently,part by running dry and partly throttling the delivery. The effect of the additional resistance coming in is clearly visible in (A) and do attempt was made to find continued. | ||