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 Rolls-Royce of America discussing test results and issues with the Imco Autopulse fuel pump.
| Identifier | ExFiles\Box 41\1\ Scan026 | |
| Date | 13th November 1926 | |
| ROLLS-ROYCE OF AMERICA, INC. SPRINGFIELD, MASS. X3800 Oy3-E-111326 November 13, 1926. Mr. E.{Mr Elliott - Chief Engineer} W. Hives, Rolls-Royce, Ltd., Derby, England. Re Imco Autopulse Dear Mr. Hives: We have your reports on this. I have used a single one for a year on my own car with excellent results - but we know that it will not quite take care of full-throttle demands, so the double unit should properly be used. Hulley has had one for six months on the dynamometer working in conjunction with a Brown and Barlow type (orifice and standpipe) flowmeter. It has proved itself very reliable in both installations, with the following reservations. (1) The die cast metal used for the top is too soft so that the inlet union is very liable to leak air. Air leaks on the intake give the galloping and noise you refer to. When properly installed the device makes not much more noise than the clock on the dash board, in our experience. But it must not be mounted on the dash, otherwise noise is objectionable. (2) The single type mounted on the gasoline pipe does not seem to have a good enough ground. Corrosion of the union faces sets in after a time. A separate ground connection from the case is desirable. A bad ground connection gives weak and erratic action. We should think that the duplex instrument was very promising as a feed for the car but should be rather specially mounted, say on a non-metallic base (with separate ground connection) to avoid noise. | ||