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Spark Plug Gap

 
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Old 05 May 2003, 11:29 pm
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Default Spark Plug Gap

Any thoughts? [:I]
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Old 05 May 2003, 11:45 pm
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[:I]'Bout What???
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Old 05 May 2003, 11:57 pm
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Believe it's .048-.053
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Old 06 May 2003, 11:41 am
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About changing the gap after upping the boost. Makes sense to me...
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Old 06 May 2003, 01:50 pm
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You may try as low as .042 according to other discussions of plug changes for turbo 2.4L in PT. Stay away from dual tip, splitfire, or non copper dual or triple electrode designs.

The #440 Copper Champion seems to be the most durable, and least like to cause detonation or "diesel effect" from too small of an electrode heating up enough to ignite fuel without a spark.

It also should be a little "colder", with the electrode more recessed, which, again is less likely to heat up to the point of misfire in a Turbo or Super Charged engine.

There was quite a bit of discussion on the PTCC site, and posts by MX-5 seemed to be very accurate in explaining the differences and what the outcome would be from different types of plugs.
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Old 07 May 2003, 10:56 am
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Quote:
quote:Originally posted by Dalite

posts by MX-5 seemed to be very accurate in explaining the differences and what the outcome would be from different types of plugs.
Thanks for the compliment!
Although I've been reading this forum for over a year, I didn't have anything to say until now.

I'm the guy who got the #7440 double platinums to market. I do not use them on any forced induction or NOS setup. Stay with the #440 standard copper plug. The 3032s are single platinum in a colder heat range.

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Old 08 May 2003, 09:46 am
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talking to my turbo buddies they said that the stock plugs are usualy ok the way they are.. wires are the thing to upgrade.. but I dont know if the ones that come stock still work well after boost is turned up or not..
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Old 08 May 2003, 10:19 am
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When you are running a gap that is over .040 to .045, any plug failure is murder on the wires. Electronic ignitions are capable of producing so much spark to match the wider gaps, that plug misfire makes the cable the weakest link, by forcing it to carry higher energy than it is designed to carry other than for short durations. If you want the performance to stay at the top of it's game, you could consider changing the wires out to a larger core, and reducing the gap slightly...
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Old 09 May 2003, 03:47 pm
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A turbo car running .050 is pretty crazy. Once you raise your boost, you will have a higher chance of blowing out your spark at about 15psi or so. ON my surpa I would miss alot on high rpm high boost so i went from stock .043 to .032 and the car became a happy camper.

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