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8N 12v spark plugs

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Mike 8N-B

03-07-2001 07:10:33




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What should I be using for spark plugs? I have an 8N-B that had been converted to 12v.




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chuck

03-07-2001 07:46:34




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 Re: 8N 12v spark plugs in reply to Mike 8N-B, 03-07-2001 07:10:33  
I don't think that anything changes relative to the spark plugs when you change the low tension side to 12volts. I did it years ago and if I'm not mistaken the plugs that I put in 5 years ago are Champion H10s. They run fine. I used the Autolites a for a few years before that. I have found them to be equal in performance if the ignition system is good. The Genese (sp?) electronic ignition and a 12 volt coil has made my ignition system "bulletproof" (simple). I haven't even looked at the plugs since I put them in way back when. The only problem I did run into was a miss one day that I traced to a corroded coil-to-distributor wire end.

chuck
436244

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Mike 8N-B

03-07-2001 07:33:45




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 Re: 8N 12v spark plugs in reply to Mike 8N-B, 03-07-2001 07:10:33  
I hate when people jump the gun. I just did. I found my answer in the archives.
Looks like AutoLite 216 / 437 gapped to .025, is the way to go.



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Claus

03-07-2001 09:14:35




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 Re: Re: 8N 12v spark plugs in reply to Mike 8N-B, 03-07-2001 07:33:45  
.025 is the "Aunt Tilley's gap" This is for people who do not take care of their tractor. If your tractor ignition and engine are in good shape you should go to .030 . This will give better combustion. Of course .025 is more tolerant of poor igntion, since it will fire at a lower voltage but at a cost.
Happy Motoring
Claus



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bert

03-07-2001 15:08:06




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 Re: Re: Re: 8N 12v spark plugs in reply to Claus, 03-07-2001 09:14:35  

I read Claus' comment about gap and a light bulb came on over my head.

H 12s come pre-gapped at .030 (yes I check every one) and all this time I've been sweatin' the gap thing.

I've put in all new electrics, filed every contact till they shined, sprayed on that red stuff and now I find I was gappin' too tight.

This tidbit never surfaced when I searched the archives.

Thanks, Claus, for the plainspeak.

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Claus

03-07-2001 16:46:23




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 Re: Re: Re: Re: 8N 12v spark plugs in reply to bert, 03-07-2001 15:08:06  
What I did not want to start, was to advertise that everyone should gap their plugs at .030. The Keyword was an engine in good condition both electrically and mechanically. Remember when the plug electrodes wear, it will take a higher voltage to achieve dilectric puncture. (arcover) this is because voltage likes sharp electrodes. That is why Ford recommends .025 to .028. This gives some slack and allows older plugs or a little contaminent not to interfere with the firing of the plugs. If you experience missing after a while with the .030 gap, then it might be prudent to decrease the gap a couple of thousands. Newer electrical systems are capable of a much higher voltage/current and you will find the gaps greatly increased. .040 and higher.
Happy Motoring
Claus

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Mike 8N-B

03-07-2001 15:29:53




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 Re: Re: Re: Re: 8N 12v spark plugs in reply to bert, 03-07-2001 15:08:06  
Yes, Thanks Claus. I have not seen this before, but when the new plugs go in I will gap them to .030.



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