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 Posted: 08-30-2006 01:21 pm
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Ron Mau
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Location: Davenport, Iowa USA
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I have been having problems with my spark plugs going bad and not firing. I have switched to Petronix ignition with the high output coil. I use NGK BP7ES, I have them gapped at 45 thousands.I was at 35 when my problems started.

What plugs is everyone using with the petronix ignition? And what gap are you set at?

Ron Mau

 

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 Posted: 08-30-2006 02:12 pm
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Jensen Healey
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BP6E(S or Y) Is a better heat range for the JH. I use Autolite 64's with good sucess.

Do your plugs show any visible signs of failure?

Kurt

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 Posted: 08-31-2006 03:30 pm
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Judson Manning
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NGK BPR6ES is what I'm using in all of my engines.  I gap them .025" to 0.035" based on the ignition system.

The gap will be determined by the c/r of the engine and the output of the coil.  The higher the c/r, the smaller the gap; the higher the coil voltage the larger the gap.

A simple Pertonix distributor kit doesn't give you any more coil output.  Neither does using the Lucas 'sport' coil or any other aftermarket coil.  Ok, maybe you do get a little more, but it's nothing like the ridiculous voltages produced by an MSD, et.al. type of ignition system.

The only time I'd go above 0.035" is if I was using stock c/r pistons and an MSD type of ignition system.

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 Posted: 08-31-2006 10:32 pm
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John Kimbrough
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Ron, check out my web site below.  I had the same problem with my stock JH with pertronix ingnitor and high voltage coil.  I gapped them at .045 to get the engine running smoothly, then backed them off to .040 and have had no more fouling problems

http://home.comcast.net/~jrkengr2/

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