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Old 03-09-2009, 09:27 PM   #1
S L O W W R X
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Default JDM Version 8 Head...Spark Plug question

What plugs are you guys running in your JDM heads, I think mine ended up with the wrong plugs in them and I can't seem to find which plug is right wrx or sti or a different plug all together.
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Old 03-09-2009, 10:14 PM   #2
seanathanq83
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i would like this too, i am building my v8 207 at the moment
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Old 03-09-2009, 11:05 PM   #3
mick_the_ginge
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The JDM 2.0 heads use the shorter WRX plug
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Old 03-09-2009, 11:07 PM   #4
seanathanq83
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is there a certain heat range? or is it the stock wrx heat range
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Old 03-09-2009, 11:16 PM   #5
mick_the_ginge
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Stock is a 6, most run the 7, very few run the 8
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Old 03-10-2009, 12:49 AM   #6
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Quote:
Originally Posted by mick_the_ginge View Post
The JDM 2.0 heads use the shorter WRX plug
Thanks I thought that was the case but when I pulled them out I was starting to second guess myself.
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Old 03-10-2009, 02:01 AM   #7
FuJi K
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I think I will be running plugs for STi so it's further away from the head... reducing the hairline cracks. The piston's dome does NOT come up more than the block deck.
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Old 03-10-2009, 10:37 AM   #8
mick_the_ginge
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Quote:
Originally Posted by FuJi K View Post
I think I will be running plugs for STi so it's further away from the head... reducing the hairline cracks. The piston's dome does NOT come up more than the block deck.
You better hope that the exposed threads don't carbon up otherwise you are going to destroy the spark plug hole threads when you try and remove them.
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Old 03-11-2009, 03:33 PM   #9
Pavlo
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Stock = PFR6B (good quality platinum plug)
Cooler = PFR7B (one grade cooler than above)
Cooler still = BKR8EIX (iridium 8, but really a long life plug rather than a performance plug)
Race = R7434-8 (hand assembled, dual irdium retracted electrode race plug)
Mad mofo race = R7434-9 (cooler version of above)
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Old 03-11-2009, 06:14 PM   #10
seanathanq83
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are the race versions NGK also? where can you get those
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Old 03-11-2009, 06:40 PM   #11
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Old 03-11-2009, 06:55 PM   #12
Rasmusson14
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Coppers.......cheap and very reliable spark. Switch out every other oil change.
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Old 03-11-2009, 07:04 PM   #13
seanathanq83
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yea i used copper and with all the tuning and adjusting i have done, i can tell they are getting fouled out, i really need to change them, i will be going back to regular heat range and iriduims, but when i get the engine built i will be using 1 step colder, maybe race who knows
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