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).
Comparing a Delco Remy ignition contact breaker unit and coil against an in-house design, focusing on spark energy.
| Identifier | ExFiles\Box 163\7\ img072 | |
| Date | 11th July 1926 | |
| EFC. X4284 EFC/T1.7.26. X4652 X4284 DELCO REMY IGNITION Recently we obtained from The Delco Remy Co. a Remy contact breaker unit with nearly closed iron coil, on which apparatus we have made some observations. Some of the results are contained in my assistants reports WB.{Mr Brazier/Mr Bell}80 and WB.{Mr Brazier/Mr Bell}87, copies herewith. The available spark energy from this Remy (see WB{Mr Brazier/Mr Bell}80) appears to be very much less than our own, and it appears, that engine ignition, using this coil, would be stopped by placing the hand on the coil, in the same way in which we used to be able to stop the ignition of the engine in the early days of the improperly cured bakelite material used for the coil cases, at the same time feeling the effect. Rightly or wrongly our method has been to provide sufficient spark energy in the first instance to overcome contingencies, so as to ensure regular sparking, and now we are gradually by the use of (1) Finer primary coils, (2) Larger ballast resistance reducing the amount of energy available until we find a reasonable practical limit. The taller ignition coil was at the time of its institution a means of increasing the available spark energy, not by actually increasing the consumption appreciably, but amongst other things by getting the outside of the secondary winding more remote from the case, since which time the moulded cases | ||