| [GMCnet] Tid Bit. Will a high voltage output coil make my engine run better. [message #340713] |
Thu, 07 February 2019 13:48  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Talking in general term. Not specific voltages. A standard ignition coil can puts out 12,000 volts. An after market high out put coil may state that it has the potential to put out 30,000 volts. Maybe they both cost the same. Well. Is the 30,000 volt coil a better deal? At idle. The spark will jump the spark plug gap at a point that the voltage can over take the resistance that exist at the gap. This will happen at a few 1,000 volts. As the throttle open further. And more air/fuel enters the combustion chamber. Then the piston comes up to compress that mixture. Our GMCs have a compression ratio of around 8 to 1. This means that the air volume that is pushed in by the outside atmospheric pressure. Is 8 times greater then the combustion chambers volume in the engine head. When the piston is at the top of the compression stroke. The density of the air/fuel charge is at the maximum. Thus the resistance for the electrons to travel across at the spark plug gap increases. Next the coil has to produce a higher voltage. This maybe in the 6 to 7,000 volt range. The 30,000 volt coil's extra capacity will not ever be needed, and can't ever be of any value to you. I use a pure stock GM coil on my race engine. At up to 8,000 RPMs. With a compression ratio of up to 13 to 1. The HEI system coil operates at a higher voltage then the points controlled units. This is due to a wider spark plug gap. Bob Dunahugh
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