I spent a couple months digging through German history books to find the details. Understanding machine translation of German can be a puzzle but I got through it. This article goes back to the time and the people who started the whole thing. It is an account of the invention of the 4-stroke internal combustion engine. It changed the world.
Ignition:
One of the important and to some people mysterious systems is the ignition. This article starts with auto ignition early history and ends with the GM HEI.
Ignition 2:
All the details about the GM HEI system plus information about modifying it for high performance use.
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