electronic spark ignition for model engines
Alan Gorham email (remove spam text)
Thanks for the reply, it gives me a start if nothing else!
I have my own trick for finding TDC - remove the glowplug and insert a piece
of dowelling down the plughole until it touches the piston crown.
Turn the crankshaft until the dowel does not rise any higher and then put a
mark on the dowel where it exits the cylinder head. A tiny 'pop' or scratch
can be made on the end of the crankshaft denoting TDC.
Your suggestion seems to give a little bit of ignition advance. I was hoping
that someone had either heard of a reasonable ballpark amount of advance for
a model engine or had done it themselves. I will be the person flicking the
prop here and IIRC too much advance can lead to a nasty bite!
>In a car you will see the spark pulse around 10 degrees before TDC - this
is adjustable by turning the distributor (this is the equivilent of
>rotating the mount of your hall effect sensor) I suspect you may need less
of an angle in this engine as the flame front will move across the
>combustion chamber in considerably less time than in a car due to size
>Hope this helps
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