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Discussion Forum
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Need hotter spark

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JEB

03-13-2002 18:48:01




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I have an Int 350 that fouls the plugs. If I pull a wire from the cap and hold it 1/2" away the plug fires just fine. What causes this? What can I do to get hotter spark?
I have changed the plugs, wires, & cap and they foul within the hour.




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Kendall

03-14-2002 14:35:41




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 Re: need hotter spark in reply to JEB, 03-13-2002 18:48:01  
I agree with Bob Kerr, If you got black smoke, you're running too rich. The soot from the unburned fuel is fouling your plugs.Tune your carb, rebuild if necessary.



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Dave

03-14-2002 07:21:08




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 Re: need hotter spark in reply to JEB, 03-13-2002 18:48:01  
Many people do not understand the heat range's of Spark plugs The heat range of a plug deals with how fast the heat is transferred from the electrode of the plug ,,therefore if you keep the electrode hotter they will stay cleaner by burning off any fouling,but you have to be carefull not to get too hot of a plug or it will damage plug from too much heat ,,so you have to adjust in small increments when changing heat ranges hope this helps Dave

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Steven@nd

03-13-2002 19:55:43




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 Re: need hotter spark in reply to JEB, 03-13-2002 18:48:01  
When our 544 does that it is time to regap the points. You didn't mention anything about the points in your post. OR make the switch to the electronic ignition, I hear they are better for avoiding the fouling.

Steven



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Dan

03-13-2002 19:16:51




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 Re: need hotter spark in reply to JEB, 03-13-2002 18:48:01  
What is fouling your plugs fuel or oil?



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andy

03-13-2002 20:04:53




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 Re: Re: need hotter spark in reply to Dan , 03-13-2002 19:16:51  
I had a 706 that would start fouling plugs within one-half an hour. I started increasing the temperature range by replacing with hotter plugs. Nothing worked until I put in Champion Y or D 21's I believe. Anyway the "21" is right. This tractor was burning 2 - 3 quarts an hour. No problem ..... these plugs stayed clean! I know ... some do not like Champions. But they really worked. It looked like a diesel sitting there running the corn dryer. You might ask yourself what the real problem is and can it be fixed easily? The problem with the 706 was a plugged air intake system. The restriction caused to much vacume on the intake stroke. This actually sucked the oil up along the piston. There was a bunch of straw, leaves & stems in the pipe leading to the air cleaner. Couldn't see the restriction until extensive examination. Anyway the restriction is removed and the 706 is back to normal!

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JEB

03-14-2002 05:59:43




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 Re: Re: Re: need hotter spark in reply to andy, 03-13-2002 20:04:53  
I think it's fuel fouling the plugs, I get black smoke out exhaust. Have replaced plugs with CH D21's, points, cap, wires, none of which helped.
Compession is OK.
When running I pulled wires to isolate which plug had the most problem, and when one particular wire was 1/2" from the cap and arching across the gap the engine ran great like this for hours.



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Bob Kerr

03-14-2002 09:56:35




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 Re: Re: Re: Re: need hotter spark in reply to JEB, 03-14-2002 05:59:43  
I would forget about the ignition and fix the carb first, If you are getting black smoke lean out the mixture. If that doesn't help, rebuild the carb. Too much fuel causes black smoke, and it also will cause cylinder wall wear from the excess fuel "washing" the oil off the walls. Then after you get that straightened out run it for a while as you normally do and them pull out the plugs right away and look at them. They should be fairly clean at the gap area and the porcelain should be a very light tan color if you have fairly new plugs.If the gap area is black or grey, go with the next highest heat plug, But remember,IH engineering did all the homework on plug heat range and brand of plug,so use what the book says to use for that engine.

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Dave_D

03-14-2002 09:30:41




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 Re: Re: Re: Re: need hotter spark in reply to JEB, 03-14-2002 05:59:43  

My farmall B would only run on 1 cylinder until I switched to D21's. There was a post a while back that said the No foul plugs that are sold in JC Wittney do the same thing as what you are doing by holding the plug wire away from the spark plug. I also heard of taking a blown fuse and putting inline to do the same thing.

Good Luck



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