Favorite Spark Plugs?
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
I've done a lot of spark plug dyno testing on street motors and seen very little if anything between brands or styles, and I've tried a lot of both. I've seen more difference with gap than with what kind of plugs they were. How many miles they go, I don't know. I never let them get that old.
Running nitromethane the only plug I found that would hold up was Autolite. The ceramic insulator broke on every other brand I tried. Ceramic is real tough on exhaust valves and seats when it goes through. The nitro burners respond to cut back straps and indexing quite well. They do have some newer Champion Top Fuel plugs I have only a little experience with.
Even though I never found much power doing it on street motors, I am kind of **** and still cut back the straps and index the plugs on my street cars and bikes. I'm not picky about brands for the street though. Because they worked so well for racing if I lean towards any brand it would be Autolite.
Running nitromethane the only plug I found that would hold up was Autolite. The ceramic insulator broke on every other brand I tried. Ceramic is real tough on exhaust valves and seats when it goes through. The nitro burners respond to cut back straps and indexing quite well. They do have some newer Champion Top Fuel plugs I have only a little experience with.
Even though I never found much power doing it on street motors, I am kind of **** and still cut back the straps and index the plugs on my street cars and bikes. I'm not picky about brands for the street though. Because they worked so well for racing if I lean towards any brand it would be Autolite.
Last edited by v2racing; Feb 2, 2011 at 04:07 AM.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Melting Slicks
Joined: Apr 2008
Posts: 2,625
Likes: 242
From: Russell Ontario
St. Jude Donor '09
I have changed so many plugs and I don't see much diff. in any , I even won a set of Splitfire plugs I tried in the vette, and could not tell the difference, so it's like oil use what you like.Ron
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
when I first went to Crane digital multi spark/Crane super magnetic coil/Taylor 10.4mm pro race Wires. You could just about arc weld with the fuzzy glowing spark it would produce. I would gap my plugs to .046 0 .050 and after a summer time of driving the gap would be over .070 and the center electrode rounded down.
So I moved up to Platinum and they just last. It took me awhile to figure out the old short reach peanut plug number 10 year or so ago. then I moved up to aluminum heads with 3/4 deep reach and it took awhile to figure out the correct number becuase no common vehicle uses them. And they don't have a section called "After Market DART. BRODIX, AFR heads"
So now I just use them on every non-power boosted motor I'm around that you can get them for.
Last edited by gkull; Feb 2, 2011 at 04:58 PM.
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