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Farmall & IHC Tractors Discussion Board |
Re: Does it matter,coil wiring
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Posted by Janicholson on July 17, 2007 at 06:08:37 from (66.173.50.62):
In Reply to: Does it matter,coil wiring posted by BEL@IN on July 17, 2007 at 02:06:48:
The spark across the plugs consists of a series of rapid bursts of electrons which initialize their path through the fuel charge by building up voltage until the force of the volts exceeds the resistance of the fuel/air mix. As the spark is essetially pulsed DC elecrticity, it is polarized. If it jumps from the ground electrode to the center electrode, most of the burst of charged gasses (plasma) in the spark will be near the cooler part of the exposed parts of the plug. This has been proven in testing under lab conditions to begin the flame travel in the fuel/air mix less efficiently than when polarized correctly. How much effect this has changes from engine to engine, plug to plug within the engine, and fuel to fuel (and other factors).
The effect was large enough to be noticed by manufacturers and engineers when point and coil ignitions replaced make and break, viabrator, and hot tube ignition in the early 1900's, even with much less sophisticated dynos. I hope this makes sense. A tractor engine may not seem to run any differently, but it is.
Some think that if it is firing on all cylinders it is working perfectly, Not true, spark intensity and polarity make a difference. JimN
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