Jun/Jul 2008

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Gas Engine Ignition

By Chas. H. Wendel

Atkins, Iowa 52206

With the invention of the gas engine as such, came many problems, one of the greatest being that of a dependable ignition system.

In the earliest gas engines, an electric spark was used to fire the charge. Electricity then being comparatively little understood, the troubles experienced with this mode of ignition led to its being abandoned in favor of first the slide-valve method of ignition, and later of the hot-tube method.

The slide-valve method consisted of a small reciprocating slide valve which had a pocket that was put in communication alternately with the fresh mixture and the cylinder. When this pocket was filled with the fresh mixture, a further movement of the valve brought it into contact with a small external flame which ignited it. As the slide-valve continued its travel it was brought into communication with the cylinder when ...

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