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Spark plug heat/numbers

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Scott Green

01-16-2003 16:36:25

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Hi again everyone , another question here. For years , as I understand it , the higher the number , the hotter the plug. I have a neighbor who is trying to tell me that Champion spark plugs(which I'm not fond of) now go the other way. The hotter the plug , the lower the number. He was told that at the auto parts. Another neighbor backs him up. What benefit would this change give champion? I still don't believe it. Does anyone know of a web site where I can check this out. Has anyone here herd of such a change? Thanks , Scott

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Joe (Wa)

01-17-2003 20:53:27

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Re: Spark plug heat/numbers in reply to Scott Green, 01-16-2003 16:36:25

Hi Scott, I always thought that the length of the positive electrode protruding from the insulator determined the heat range of a plug. In other words having two plugs with equal length electrodes, the one with the shortest insulator is the hotter plug.....or is that the colder plug??....Getting old ain't all that much fun. Joe

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Ben in KY

01-17-2003 22:05:20

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Re: Re: Spark plug heat/numbers in reply to Joe (Wa), 01-17-2003 20:53:27

Joe, I believe the shorter the insulator the colder the plug.

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deadeye

01-16-2003 23:22:27

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Re: Spark plug heat/numbers in reply to Scott Green, 01-16-2003 16:36:25

I'll send you an e-mail with attch.

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Skinner

01-17-2003 20:08:28

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Re: Re: Spark plug heat/numbers in reply to deadeye, 01-16-2003 23:22:27

Heck, could you share the info with all of us? I was under the impression a D16 was hotter than a D14, hope I don't have it backwards as well....

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CNKS

01-18-2003 08:45:29

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Re: Re: Re: Spark plug heat/numbers in reply to Skinner, 01-17-2003 20:08:28

The D series plug numbers increase with heat range, ie a D16 is hotter than a D14. Looked at auto plugs on their web site -- those numbers make no sense to me.

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