Posted by Bob M on October 30, 2009 at 06:54:05 from (151.190.254.108):
In Reply to: Re: Pertronix Ignitor posted by John T on October 29, 2009 at 14:57:46:
Hey John - I agree with you 100% - despite your preference being toward those GREEN tractors(!).
I could have better explaining my statement about the Pertronix and its higher voltage spark. I should perhaps written this:
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The Pertonix has the CAPABILITY to provide a higher voltage spark. However unless the gap at the spark is opened up, the spark voltage seen at the plugs is unchanged with the Pertronix.
However the Pertonix' higher voltage capability can be utilized to reliably jump a LONGER spark gap. Also with the right coil the Pertronix can produce a greater spark current. This combines to develop at a longer, hotter spark in the combustion chamber. This in turn provides more reliable better ignition of the fuel/air mixture - particularly if the mixture is a slightly rich or lean.
(This incidentally is what drove car manufacturers to electronic ignition in the 1970's - the ability to fire a leaner than ideal mixture. The longer and hotter spark the spark, the more fuel mixture is initially ignited, and thus a flame reliably propogated through the entire fuel/air charge.)
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The Pertronix is not without a few disadvantages however:
If other ignition components - plug wires, distributor cap, external plug insulators, etc - not in good shape, increasing the plug gap so higher voltage can be developed at the plugs may result in the spark jumping someplace other that at the plug gap. (We learned this on the 3020 with a worn out distributor cap on a damp morning.)
Likewise old, worn out plug wires and dirty external plug insulators will make then engine look like a July 4 fireworks display in the dark as stray HV current dances over this stuff.
Also if the engine has other issues causing it to foul plugs/misfire (rich carb, oil burning, low compression, sloppy distributor drive, etc) the Pertronix will not improve the situation any.
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