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Originally Posted by Wally
So, if I unerstand correctly, its an ignition system with a build-in knock sensing and automatic retarding device?
Clever! You then don't have to 'listen' for knock with all of its difficulties on an aircooled engine (see other thread :-) )
Greetings,
Walter
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Hello,
Yes, in a way. But it's far from simple. A very, very high current is sent through the sparkplug, just prior of ignition. The sparkplug then acts as a sensor as it measures the "density" or the way the mixture ionises (sp?). I really don't know how to say it otherwise. The rate of ionization determines the moment of the ignition. It doesn't really retard but it's more some sort of time-travelling
because it shifts the ignition forward or backward according to the ionization. Goal is to have the PPP (peak pressure point) around 30 degrees ATDC IIRC.
Well, that is what I know about it, maybe someone with more indepth knowledge can chime in?
Cheers,
Richard