Plug for Oil-engine to Producer-gas Conversions
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EA.-Simms Device for A.E.C. and Leyland Power Units Which Involves No Alteration to Cylinder-head Castings
WE have made reference on a previous occasion to the contribution to the development of producer gas as a fuel for road vehicles that is being made by E.R. Plugs, Ltd., Angel Road, Edmonton, London, N.18, and by Simms Motor Units, Ltd., Oak Lane, Finchky, London, N.2. Now we can announce a joint effort of these two concerns— the E.R.-Simms plug for conversion of oil engines to electric ignition when using gas fuel.
The device is designed to replace the injector valve without any alteration to the engine, and has, up to the present, been standardized for Leyland and A.E.C. Comet power units. The types for these two engines are designated, respectively, D80 and D35. The accompanying drawing shows the former; the latter is much shorter, but similar in most other respects.
As will be observed, the body, in so far as the major part of it is concerned, is the same as the injector body. At the inner end', however, it is threaded externally to take a standard 14-mm. spark-plug body, and it replaces, in effect, the ordinary plug gland nut. There is no thread on the plug body, but the usual soft washer is used in normal manner to make the joint with the cylinder head.
Within is a standard plug body having a push-type terminal,, into which the h.t. lead is inserted. Inside the " injector " body is a mica sleeve, to prevent internal flash-over. A push-fit in the bore and abutting on the mica sleeve is a loose collar, and against this a rubber seal ring, which, when compressed by the final gland nut, which screws into the outer end of the body, grips the lead and makes a water-tight joint. For use in conjunction with this sparking plug, Simms Motor Units, 'Ltd.. offers ignition equipment comprising contact-breaker, distributor, coil, etc., specifically designed for taking the place of fuel-injection apparatus and suitable for functioning as auxiliaries to power units having the high compression ratio customary in the case of conversion from oil fuel to producer gas. This may be as high as 12 to 1, so insulation is stressed the more highly.