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Farmall & IHC Tractors Discussion Forum
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differnce between spark plugs????

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sHan,TN

03-20-2006 19:37:04




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long time no post, lol can anyone tell me the difference between a Autolite 386 and Autolite 3116 like heat diff etc. i want to get the right one for my 42 H thanks




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Dellbertt

03-21-2006 05:55:38




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 Re: differnce between spark plugs???? in reply to sHan,TN, 03-20-2006 19:37:04  
About 10 years ago I switched to Delco C85 or C87 (little hotter)for all my older Reds (and Greens) and am not fouling plugs at all. I put the Champions in the trash where they belong.



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thanks

03-21-2006 04:57:13




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 Re: differnce between spark plugs???? in reply to sHan,TN, 03-20-2006 19:37:04  
thank you



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sammy the RED

03-20-2006 20:32:13




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 Re: differnce between spark plugs???? in reply to sHan,TN, 03-20-2006 19:37:04  
Use ---> Champion D-21



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John T

03-20-2006 19:45:16




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 Re: differnce between spark plugs???? in reply to sHan,TN, 03-20-2006 19:37:04  
Han, I believe the 3116 is a slightly hotter heat range plug then the 386 but a tad colder then the 388, HOWEVER whats more important is the 386 is a resistor plug while the 3116 is a NON resistor plug. Its especially important on Magneto Ignitions to use wire core plug wires and non resistor plugs so one doesnt waste energy in the resistances versus discharging it all across the plug gap where its needed the most. I recommend NON resistor plugs in the old Mag or Coil Ignitions plus a heat range hotter then specified if the tractor is used for parades and light duty or the engines worn which can help reduce premature plug fouling.

John T

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sHan,TN

03-20-2006 19:52:11




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 Re: differnce between spark plugs???? in reply to John T, 03-20-2006 19:45:16  
i should have said it is not a mag. i have a new set of wire core plug wires and wanted to put in some new plugs butt i dont want to burn any holes in the pistons i dontuse the H for much except to mow about 2 acres of grass every now and then. thanks for the help..



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John T

03-21-2006 08:41:10




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 Re: differnce between spark plugs???? in reply to sHan,TN, 03-20-2006 19:52:11  
I dont see much channce of burning holes in the top of a stock H piston from use of 3116 or even far hotter plugs. Nowwwww ww if it were souped up running extreme high compression and exotic fuel at high RPM at high temps and maybe fast timing, you may have a worry, but a low compression H at relative low operatign temps and regualr gas at slow RPM I seriously doubt a 3116 plug is ANYYYYY YYY problem

John T

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