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Author Topic:   plugs, reading and heat range.
JohnG
Dirt Maniac

Total posts: 137
posted September 12, 2005 04:21 PM  
I ran some ngk 7 heat range plugs and one autolite 135.

the 135 should be hotter according to cross reference.

the 135 looked black and really really rich. the ngks were perfectly browned...

Looking down the end the ceramic is clearly diff lenghts in the two plugs.. I realize I shouldnt mix and match plugs etc, but broke a ngk and had the 135 new at the track.

seems like this is opposite to me, I should be richer looking on the colder plug shouldnt I??

guess i wont be swapping plug brands after I have the jetting figured out. with the 135 I need to go down about 3 jets..

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