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).
Test report on a Springfield De Jon ignition coil that failed during a standard heating test.
| Identifier | ExFiles\Box 164\5\ img038 | |
| Date | 2nd February 1931 | |
| E.7.C X6101 Ref. No. W877 Date 2-2-31 X.Nos. 6101 Springfield De Jon ignition coil This coil has been tested on the bench and failed during the standard heating test which our own coils pass easily. The symptoms were a short circuit or a relatively low resistance H.T. leak, in the secondary circuit. It is quite possible that the windings themselves are OK but the insulating properties of the secondary insulation have been affected due to the heating. This coil however does not get so hot internally as the Delco Remy coil we recently tested. Our experience of past R.R. coils which have burnt out in service is that there must be a good temperature margin to ensure satisfactory performance in customer's hands in all conditions. These V.S.A. coils are all hermetically sealed in their case which may affect | ||