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Spark Plug Gap
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[QUOTE="jmics19067, post: 476974, member: 27963"] yes I agree 100% but what I was trying to say was that I believed that the points closing is what triggers the discharge not the gap which is what I thought you where saying. :think: a lot of G.M. products<I know nothing to do with dirt bikes but I thought you should know> with HEI ignitions are supposed to be gapped at .045 or .060 depending on what the sticker on the radiator shroud says. the more voltage the coil can produce the larger the gap can be . I am only making this statement based on the fact that early gm products with points usually had a gap of .032 with coils rated about 15,000 to 30,000 volts. Where the HEI coils can produce 40,000 to 60,000 volts and some vehicles have a gap of .060 twice the voltage twice the gap? I am assuming that the combustion chambers are of the same type and design for those two different vehicles. Now I can conjecture that turbulance in the combustion chamber has a major influence on spark gap only because of experiences welding in a shop compared to welding in high winds. The electrode in an arc welder has to be held closer to the work to maintain a decent arc in high winds compared to still air and I am assuming the same properties of an arc apply to both instances. I do believe what Woodsrider says about a larger gap delaying the timing slightly. I can not back it up with anything except that it just make sense to me. I am thinking that the energyfrom the coil has to wait a moment to "ball" up at the spark plug electrode to cross a larger gap compared to "leaking" across a smaller gap. I also believe what Rich has to say about whats happening inside the combustion chamber. If you think about a stale fuel that isnt at a perfect stoichemetric<?> ratio near the plug it isnt going to burn as easily. Anything else that plays into the role is way beyond my knowledge or understanding at this point. one of the neatest things <although terrible to work on>I have ever seen in a combustion chamber was on a Honda Prelude engine from the early 80's I think. If you can imagine this poor description; The carburator was a three barrel two were progressive and fed thru a typical manifold into a combustion chamber right above the piston. The third barrel of the carb was fed thru a different intake manifold into this litttle pocket right next to the spark plug. The casting of the head had a drilled wall between the two kinda like a screen. It was a four valve head two for the exhaust one for the typical intake and one for the pre combustion combustion chamber<?>. [/QUOTE]
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MX, SX & Off-Road Discussions
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Spark Plug Gap
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