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Farmall & IHC Tractors Discussion Forum
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Hey Rusty Farmall

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Red Dave

09-11-2007 12:13:31




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I did a little hunting around for some information on the 386/388's. Autolite calls them a "suppressor" plug.

Here's a link, but you'll have to scroll down almost halfway (page 20) before you get to them.

3116's are listed on page 31 as "non resistor" for Checker Cabs?

I really don't know how much, if any, difference it actually makes.

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jonnny2006

09-11-2007 16:34:04




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 Re: Hey Rusty Farmall in reply to Red Dave, 09-11-2007 12:13:31  
I was a D-18, D=21 guy For along time....Never really had a problume with them except once in a while i got one that was bad out of the box and then i had to run an old plug till i went to the store to return it, when it happend i usually ran a old plug and forgot to get a new one. I now run the 386's as i never had a bad one yet. I think the wires would make a bigger diffrence as the local parts store guy threw his hands up when i asked him which were better champions or autolite. I always run steel plug wires and not the carbon type.( I think the steel or copper core wires are most important to run with a magneto) As far as the 386's and the d-21's are concerned I cannot tell any diffrence in how the tractor runs as i still have a few tractors using the d-18 or d-21's. the parts book at this place recomended the d-15 d-18 or d-21 be used in the H. The cross match for the D-21 is the 386 autolite. I am now going with the autolites. But really as long as they work out of the box I dont think its makes one bit of diffrence. I do wonder which one will last longer???

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RustyFarmall

09-11-2007 14:45:10




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 Re: Hey Rusty Farmall in reply to Red Dave, 09-11-2007 12:13:31  
O.K., for what it's worth, I went to the Tisco website and looked up both the 3116s and the 386s, and the 3116s are a non-resistor plug, and apparently the 386 and the 388 are of the resistor variety.



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Janicholson

09-11-2007 12:43:12




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 Re: Hey Rusty Farmall in reply to Red Dave, 09-11-2007 12:13:31  
The resistor plug (supressor) causes the firing voltage of the plug to be about 10 to 15% higher than non resistor plugs. (resistance adds to the effective resistance) of the spark gap. The resistance also reduces (substantially) the emission of radio frequency interference caused by the wir acting like an antenna broadcasting the spark as radio waves). It can increase ith intensity of the spark a bit like holding the wire away from the plug terminal. I hope this helps. JimN

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Red Dave

09-11-2007 12:52:18




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 Re: Hey Rusty Farmall in reply to Janicholson, 09-11-2007 12:43:12  
Thanks Jim, I knew that part. The part I'm unsure of is just how much difference it really makes using resistor vs non resistor plugs on a magneto ignition. Both will work. I've used both on a magneto and I think the 3116's (non-resistor) run a little better than the 386/388's (resistor). But I have no objective data to back that up, just my very subjective ear.

But, thanks for the answer.



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RustyFarmall

09-11-2007 13:14:22




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 Re: Hey Rusty Farmall in reply to Red Dave, 09-11-2007 12:52:18  
Red Dave, thanks for the link. I printed out the 12 pages that have listings for farm tractors, and after studying on it for awhile, I think it looks like the 3116s are recommended for pretty much all of the IH letter and number series up through the 450, and the 386 is recommended for the 460, 560, 656 etc. I'm still scratchin' my head.



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chadd

09-11-2007 13:55:01




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 Re: Hey Rusty Farmall in reply to RustyFarmall, 09-11-2007 13:14:22  
Sounds like the changeover corresponds to the point when the tractors changed over from 6V to 12V, or am I wrong?



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RustyFarmall

09-11-2007 14:12:30




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 Re: Hey Rusty Farmall in reply to chadd, 09-11-2007 13:55:01  
Hey, I think you are on to something. I was trying to make the connection based on whether the tractor had a magneto or battery ignition and since the 3116s were to be used on all letter series up through the 450 that theory just wasn't holding true. But when the switch was made from 6 to 12 volts seems to be when the plug numbers switched also. Interesting.



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