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Harry Ferguson Tractors Discussion Forum
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Advantage of hotter coil

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Randyr

07-22-2007 09:26:05




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What is the advantage of putting on a higher voltage coil, like the Pertronix 40,000 volt coil? If the engine runs ok with the original one, will it make more power with the hotter one?
And, if the plugs foul up in time, will it allow the gaps to be opened up a bit and keep them cleaner? I already have a Pertronix ignitor, and it runs better with it. Now I'm just thinking about the coil.




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Randyr

07-23-2007 06:57:43




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 Re: Advantage of hotter coil in reply to Randyr, 07-22-2007 09:26:05  
Yup, I've come to the conclusion that it ain't worth it.
Thanks for the advise.



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Gerald J.

07-22-2007 16:56:25




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 Re: Advantage of hotter coil in reply to Randyr, 07-22-2007 09:26:05  
The hotter coil will probably let all those with in half a mile using an AM radio or a TV set to know you have the tractor running because of the extra ignition noise it will create.

Gerald J.



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CENTAUR

07-22-2007 14:09:46




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 Re: Advantage of hotter coil in reply to Randyr, 07-22-2007 09:26:05  
Jerry/MT gave you a very good answer.I will reiterate that a higher voltage coil only means you have( 40,000 volts available)but you never will need it.The only time a coil will produce that kind of voltage is if you have a completly open secondary circuit,(infinite)resistance. CENTAUR



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Jerry/MT

07-22-2007 12:41:12




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 Re: Advantage of hotter coil in reply to Randyr, 07-22-2007 09:26:05  
None of these devices will "make more power". They will just give you the power you are supposed to be getting and are not because of a weak spark or misfire. Since these engines are low compression,low rpm machines, I see no advantage what so ever to a 40,000 V coil. First of all, the spark will fire at the vlotage required to ionize the gas mixture and that's not necessarily 40,000 volts. It's more like 10-12,000 V on the outside, more likely around 9,000 V.(Reference: Internal Combustion Engines by E.F Obert, 2nd edition) Having the additional voltage capability may allow you to open up the gaps, or run with some fouling, and still have the plugs reliably fire. If you think that's a good idea and worth the additional cost, then you should get the hotter coil. Your stock coils can probably put out 20,000 V and on these engines that's plenty of margin, in my opinion. If you are going to take advantage of the Pertronix 40 KV coil, I believe you need the Ignitor II to use that coil which costs a bit more. I have the Pertronix on my TO-30 with the NAPA IC-14B coil(~$15)and I am satisfied with the system performance.

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