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Re: NGK Plugs...Power level...Beaudreau??
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Posted by Beaudreau (more from Beaudreau) on Sun, 24 Jun 2001 09:20:17 Share Post by Email
In Reply to: Re: NGK Plugs...Power level...Beandreau??, John, Sat, 23 Jun 2001 18:49:13
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The problem with running colder plugs in a street car is that the plugs are prone to foul, especially at extended periods of idle. Basically the rule for any motor that has the propensity for detonation is: too run the coldest plug the engine will tolerate under low load conditions. Finding a plug that prevents fouling and does not cause pre-ignition or detonation by staying too hot while still developing max grunt will mean that you've found the ideal heat range plug for your engine, experimentation is the only way to find this plug.

The best place to start is with a plug one heat range colder than standard. Has the engine got more power - without poor running due to the plugs fouling up? Can you advance the timing without getting detonation? Are the plugs as clean as a whistle when pulled after driving? If the answer is 'yes' to all these, try one heat range colder again. Eventually you'll get to the stage where the plugs start to foul, and you can then work backwards to pick which plugs work best for you.

If you're prepared to blip the throttle occasionally to clear the plugs and you drive the car fairly hard you may find that two heat ranges colder plugs on a hi-po engine are fine. The advanced timing that you should be able to run without detonation or pre-ignition (giving more power) will be a very worthwhile trade-off for a slightly grumbly idle.

Part of this post was taken from a members only AutoSpeed article. I hope you find this information useful.

p.s. Eric Z. is right about 16 valves needing NGK BCPXXX plugs. BCP8ES is the coldest I have been able to source in the BCPXXX plug size.

AutoSpeed

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