Racing vs OEM Spark Plugs - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 31st, 08, 06:52 AM Thread Starter
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DeAngelo
 
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Racing vs OEM Spark Plugs

I noticed that racing plugs have a smaller strap and less insulation, thus making a colder plug. Why is the strap smaller? How does that affect use? What difference does it make if I get an OEM plug vs racing plug within the same heat range? Thanks!
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post #2 of 5 (permalink) Old Dec 31st, 08, 10:32 AM
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The Driver
 
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Re: Racing vs OEM Spark Plugs

Your compression ratio will determine the heat range of the plug. I run AC R43TS in my 454 with 11.25:1 compression. If it was around 9.5 to 10.25 I would run a "4" heat range (AC R44TS) and if it was 8.0 to around 9.5 I would run a "5" heat range (AC R45TS). Don't know anything about "racing" plugs, other than there are a lot of gimmick spark plugs being produced.
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post #3 of 5 (permalink) Old Dec 31st, 08, 10:58 AM
DjD
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Re: Racing vs OEM Spark Plugs

Higher compression is indicative of more HP so the more compression the colder the plug. There are more ways to make power than raising compression so as a rule of thumb go 1 range colder than the factory recommendation for every 75 hp increase over the stock engine. The plugs insulator wicks heat from the chamber, a colder plug wicks more heat and a hotter plug wicks less.

Here's a great but of spark plug tech, page 2 gets into heat ranges...
http://www.ngksparkplugs.com/tech_su...x.asp?mode=nml

...Dennis

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Last edited by DjD; Dec 31st, 08 at 05:55 PM.
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post #4 of 5 (permalink) Old Dec 31st, 08, 11:14 AM Thread Starter
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DeAngelo
 
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Re: Racing vs OEM Spark Plugs

Thx! Long story but here is the Reader's Digest version: I have a 383 with 9 1/2 to 1 compression and Holley aluminum heads that had Autolite race plugs. It worked fine. A mechanic told me to go to a warmer plug and it seemed to work but now it pings at above 3500 RPM or so when I get on it. I have regular Autolite 3923's in it now with the timing only at 11 degrees. Total is about 32 degrees with an HEI MSD distributor. I may go back to the racing plugs coz I don't worry about fouling because I don't "baby" it. Or I may go to the 3922's since they are one step colder. I hate to go through the hassle of changing the plugs if I have to do it again if the 3922's don't work. I would then go to the racing plugs. maybe I should just go straight to the racing plugs and skip going to the one step colder 3922's. Thx! DeAngelo
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post #5 of 5 (permalink) Old Jan 2nd, 09, 09:09 AM Thread Starter
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DeAngelo
 
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Re: Racing vs OEM Spark Plugs

I received the new motor with Autolite AR3933 plugs. I am going back to those plugs. Thx. D
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