Spark plug gap

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Model T Ford Forum: Forum 2014: Spark plug gap
Top of pagePrevious messageNext messageBottom of page Link to this message  By Donald Curtis on Friday, December 05, 2014 - 02:31 pm:

Spark plug gap should be .020 .025 .030 .035? I have been told all of the above. What is correct?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange on Friday, December 05, 2014 - 02:32 pm:

Try them all and stick with the gap that makes your car run the best! :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange on Friday, December 05, 2014 - 03:31 pm:

I forgot to mention - my new Champion X plugs came pre-gapped at 0.025 inch (I checked them all before installing them), so I installed them that way and my car runs fine with them. I was too lazy to try other gaps to see if they would be better.

It takes more energy from the ignition system to force the spark across a wider gap, making for a "hotter" spark. However, if the ignition system cannot provide that higher energy, the plug will misfire and performance will suffer. The only way to find the "best" gap for your car is to experiment. :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Donald Curtis on Friday, December 05, 2014 - 04:17 pm:

Mark thanks for the info, mine came with .035 gap I will try that and will respond with my results.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dennis Seth - Ohio on Friday, December 05, 2014 - 04:20 pm:

Don't let Dean Yoder gap your spark plugs! If you don't believe me look at the thread where he is gaping the spark plugs on Rob's car! :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dwight Romberger on Friday, December 05, 2014 - 05:18 pm:

If you want to keep it factory correct, the manual says "1/32" or the width of a well-worn dime" But if you don't care about authenticity, you can set it wherever you want.

(Sorry, I couldn't resist)


Top of pagePrevious messageNext messageBottom of page Link to this message  By William L Vanderburg on Friday, December 05, 2014 - 07:57 pm:

All cars are different. But the manual does state that they are to run at 1/32" regardless of what Champion says.

My car will not run smoothly at .025


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Tomaso - Milton,WA on Friday, December 05, 2014 - 08:16 pm:

My original ignition cars like .030 and my distributor cars (I know !) like .035.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Harold Schwendeman - Sumner,WA on Friday, December 05, 2014 - 08:45 pm:

Yeah, but your distributor cars really don't really give a dang how many thousandths crankshaft end play you have!


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