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Tractor Pulling Discussion Forum

Spark Plugs, Heat Ranges, and Pulling Engines

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04-05-2004 10:25:22

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From talking to tractor pullers and other motor heads, there seems to be a misunderstanding about what a "hot" spark plug is. Some of us who didn't know better (me at one time) were mistaking what we thought meant "hot spark" for "heat range". My question is: As a motor steps up from stock to modified, what change needs to be taken in spark plugs and ignition? I was running a D21 Champion (or AC equivalent) in my stock MM U. As I increase air flow, compression, engine size, and RPM, should I use a cooler plug such as D15Y? Clue me in experts...

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04-05-2004 10:36:48

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 Re: Spark Plugs, Heat Ranges, and Pulling Engines in reply to Mopower, 04-05-2004 10:25:22  
The best thing you can do is click on this link and read all 5 pages. Then you will know everything you need to know about plugs. My second hand info would confuse you.

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04-05-2004 20:45:08

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 Re: Re: Spark Plugs, Heat Ranges, and Pulling Engi in reply to CASEPOWER, 04-05-2004 10:36:48  
Hey CP, that is a pretty good answer for a hillbilly. Grins. Ray

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04-05-2004 13:59:11

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 Re: Re: Spark Plugs, Heat Ranges, and Pulling Engi in reply to CASEPOWER, 04-05-2004 10:36:48  

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04-05-2004 18:51:02

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 Re: Re: Re: Spark Plugs, Heat Ranges, and Pulling in reply to dctom, 04-05-2004 13:59:11  
Yea, But you are old hehe

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04-05-2004 21:06:15

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 Re: Re: Re: Re: Spark Plugs, Heat Ranges, and Pull in reply to RoyG, 04-05-2004 18:51:02  
You are too Roy HeHeHe!!!!!

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