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Ford 9N, 2N & 8N Discussion Forum
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12 volt conv. question

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nateskate

04-18-2008 17:21:43




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my 48 was converted to 12v when I bought her. she has the old balest resistor running to a 6 volt can type coil. i recently while trying to find a problem, put on a 12 volt coil. the coil says that it needs a resistor. I thought that the ballast resis would work. And she ran real good but now after a little while mowing she begins to spudder and spit. so I switched back to the 6 volt coil and she runs fine but not as much power. what should I do? i like the power of the 12v can but dont quite know how to wire it.

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Brian Bell

04-18-2008 17:36:30




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 Re: 12 volt conv. question in reply to nateskate, 04-18-2008 17:21:43  
Easiest thing to do is buy a true 12v coil and get rid of the resistor all together. Search the archives or stay tuned and someone will surely post a NAPA part number for you.



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nateskate

04-18-2008 17:40:19




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 Re: 12 volt conv. question in reply to Brian Bell, 04-18-2008 17:36:30  
Would that be normal for the 12v coil to give me a noticable amount of power more?



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Dell (WA)

04-18-2008 18:55:49




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 Re: 12 volt conv. question in reply to nateskate, 04-18-2008 17:40:19  
Nate..... ..Bryan told you correctly, gitta real 12v roundcan coil (NAPA IC14-SB recommended) and use NO RESISTOR ever. Use the same points (gap = 0.015), use the same condenser, use the same sparkplugs (gap = 0.025). You just gett HOTTER sparkies when compared to the OEM squarecan 6v coil. Why? 'cuz function of coil design.

What you seem to not understand is this; someone has "farmerized" yer frontmount 4-nipple distributor squarecan ignition coil to use a 6v-roundcan ignition coil plus a 12-to-6v converting resistor. Change the 6v-roundcan coil to a real 12v-roundcan coil and use NO RESISTOR. Understand?

Face-it; the OEM 6v-squarecan ignition coil is barely adequate at best, and so someone more clever than you, decided to "fixxitt" with a roundcan coil. Well as clever as someone might have been, they still tried to do it on the cheap by using a 6v roundcan coil plus a 12-too-6v converting resistor. Electrically that works but not as good as using a real 12v roundcan IC14-SB ($15, cheap). Your call.

As to yer question..... ."Would that be normal for the 12v coil to give me a noticable amount of power more?"..... ..well iff'n yer 6v roundcan coil was NOT matched with a correct 12-to-6v converting resistor; (there are many 12-to-6v converting resistors)..... then YES yer 12v coil could give you more power by NOT missing every firing stroke. Usually weak sparkies are more noticeable with HIGH-RPM engines; tractor engines are NOT high-rpm engines..... ....HTH, Dell, yer self-appointed sparkie-meister

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nateskate

04-19-2008 04:43:46




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 Re: 12 volt conv. question in reply to Dell (WA), 04-18-2008 18:55:49  
So, I am kinda slow at these thangs. I do understand which coil to buy but you say take the resistor off and out of the loop. (this, what i am calling a resistor is long, white, attached to the firewall and has the wire going to the coil attached to one side and two wires attached to the other side. the back of the resistor is a small 1.5 inch bar with coiled wire running its length.) is this the beast I must remove when putting on the napa coil?

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Dell (WA)

04-19-2008 07:59:53




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 Re: 12 volt conv. question in reply to nateskate, 04-19-2008 04:43:46  
Nate..... ....that is correct, white ceramic thingy is a HOT resistor and NOT needed with a real 12v coil like the NAPA IC14-SB..... .Dell



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West Coast Bob

04-19-2008 09:50:21




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 Re: 12 volt conv. question in reply to Dell (WA), 04-19-2008 07:59:53  
Dell

Is the spark plug gap the same on a Magneto ignition as it is on the front mount point ignition ?

I plan to use the autolite 437's

Also since if I have your attention here what is the correct clearance between the Axle pin and the pressed in axle bushing ? As using the bushing that can be had off eBay and the pin I also received from eBay the clearance looks to be .030 to .035 or so.

Way too loose from my perspective but then this is my first 1944 2N Ford tractor.

I will post pics of this ongowing saga later tonight.

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Dell (WA)

04-19-2008 14:34:23




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 Re: 12 volt conv. question in reply to West Coast Bob, 04-19-2008 09:50:21  
WC Bob..... ...magneto or coil, sparkie gap = 0.025. 437's are good choice.

Dunnno about yer frontaxle kingpin clearances. Its a "dry" pivot point..... ...Dell



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