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Restoration & Repair Tips Board

Re: flamethrower coil pertronix for john deere 420

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Dean Olson

06-18-2012 16:22:59

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I had one on a Farmall Super C and couldn't tell any difference in performance. It lasted about a year and a half and failed. I put a new cheap stock type Napa coil back on. Been fine ever since.

I seem to remember that a given engine only needs "X" amount of voltage to start the air/fuel mixture burning and that anything beyond that is wasted.

I think that stock for your 420 will be fine.

Unless of course you have a blower,turbo, and are dumping huge quantities of fuel in it:)

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John T

06-18-2012 16:49:19

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 Re: flamethrower coil pertronix for john deere 420 in reply to Dean Olson, 06-18-2012 16:22:59  
Dean, youre pretty much on track,,the voltage necessary to arc jump current across a given gap is a function of the gap thickness and the medium (fuel and compression) in which it fires. When the coil fires its voltage ramps up b ut only until its high enough to fire the plug and no higher and in a stoc k engine that may be 5K to 15K volts or so depending on gap and c ompression. The HV coils advertised to fire at 40,000 volts =dont mean they fire at that voltage, if only 10,000 fires ther plug thats all they go to but if you widen the gap and/or raise the compression 30 to 40K may be necessary

John T

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36 coupe

06-19-2012 16:01:47

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 Re: flamethrower coil pertronix for john deere 420 in reply to John T, 06-18-2012 16:49:19  
40 K in a 9n distrubutor cap would be a disaster.The rotor would break down an arc to the distrutor shaft.I think all cylinders would have spark at the same time.The ignition wires would arc over.I have worked with 25 to 30K in color Tvs for 40 years.25 K can jump a 1 inch gap in open air.Just take a look at A gm HEI cap or the cap in a 96 and later Ford.

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John T

06-19-2012 19:08:59

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 Re: flamethrower coil pertronix for john deere 420 in reply to 36 coupe, 06-19-2012 16:01:47  
EXACTLY, thats why most of the hype and sales adds are full of it lol Typical firing voltages are wayyyyyyy less then 40 K

John T

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