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Discussion Forum

Spark plug gap

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Dave

05-17-2003 18:44:19




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A friend of mine just put a 40,000 v coil on his tractor (wd allis). What gap should he run on his spark plugs?. Would it be different for a 55,000v coil on a IH 400? He was told that with a MSD box, the gap would be .080, is this in line??? With a normal gap, do you get any benefit of the hot coil?? Thanks!




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TimC

05-19-2003 06:37:06




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 Re: spark plug gap in reply to Dave, 05-17-2003 18:44:19  
It will also matter about the cylinder pressure. If I were around 175 to 225 then I would run 60.
If I were 275 to 350 then I would run 30. I understand that extreamly high compression is harder to jump the gap. I have never seen a problem with an msd before except that it likes to jump around in the distributor eaiser than a normal system with a normal coil.



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Doug in OR

05-18-2003 16:08:16




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 Re: spark plug gap in reply to Dave, 05-17-2003 18:44:19  
.080 isn't uncommon for a high voltage coil. Remember though, once the plug fires (at about 5,000 volts), your system cannot develop any additional voltage. The better way to tell how hot a spark you get would be to know how many joules the coil will make. Voltage doesn't measure energy, joules does.



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