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 discussing the modification of distributors, a locating groove issue, and the advantages of an oil-filled coil design.
| Identifier | ExFiles\Box 168\3\ img293 | |
| Date | 12th December 1940 | |
| Elec 6119 12th December, 1940. Re/EC/LT. Messrs. DELCO REMY & HYATT, Ltd., 111, Grosvenor Road, L O N D O N. S.W.1. For the attention of Mr. B. Rushton. Dear Sirs, We thank you for your letter of the 22nd November and the enclosed drawing No GA/11375. We were very pleased to learn that you could modify the three distributors now in our possession, and we are sending them to you under separate cover. We have instructed our Order Office to issue a covering order for this work. There is still a small point which troubles our Drawing Office: The position of the locating groove will not allow for the fitting of a hexagon headed locating screw, and they have asked for this position to be lowered. A drawing showing their requirements is enclosed. The three distributors we are sending you have no groove yet, so, as far as we can see, this modification will cause you no trouble. We notice in the S.A.E. journal that the Chevrolet has made some big changes in their electrical system: an oil filled coil of higher output, increased capacity across the contact points, steeper cam lobe on the "break" side and a polarity reversing switch. We suspect that the last has been forced on them by excessive contact point wear, caused by the increased primary voltage overloading them. We like the idea of the oil filled coil since, as in high tension transformers, the windings are efficiently cooled and at the same time effectively sealed against corona attack. We shall be looking for a good coil of this type for one of our future models. We recently had the opportunity of examining one of your B.80 type distributors after 30,000 miles on the road. This unit has given no trouble and the wear on the shaft is negligible. We have noticed that these distributors, having bronze bushes for the shaft bearing, are definitely superior to the plain type with regard to wear. Yours faithfully, | ||