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Old 05-30-2007, 03:00 PM   #1
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Default colder plug part #

Curious what plugs you guys found that are 2 steps colder than stock. I went to the O'Rieley's and they didn't have any NGKs colder than heat range 5.

It's quite possible though that their guys behind the counter were complete idiots. I had to argue with them for a few minutes that the last 2 digits in the spark plug part number were the gap, not the heat range.
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Old 05-30-2007, 03:05 PM   #2
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lol...i hate whenever people that work at like napa and **** dont know what they're talking about... no matter what , they win the argument though. psh.
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Old 05-30-2007, 03:08 PM   #3
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Old 05-30-2007, 03:13 PM   #4
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Depends on what is called out as stock. 95 Miata is called out as BKR5E, so two steps colder is BKR7E.

'91 Miata is called out as BKR6E, they only have one step colder(BKR7E)
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Old 05-30-2007, 03:28 PM   #5
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Ben, in regards to NGKs....to higher the number to lower the heat range....94-06 miatas have BKR5E form the factory....which are warmer plugs than the 90-93 which utilize BKR6Es.
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Old 05-30-2007, 03:29 PM   #6
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yeah i'm seeing that now. i got a set of heat range 5 plugs, should have gone to 7.

i wish i were allowed to be stupid and ignorant about the **** that i sell.
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Old 05-30-2007, 03:33 PM   #7
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I know the feeling...I knew that damn FMU was faulty but wanted to sell it like i didn't know there was a problem....BTW it's in the mail :gay:
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Old 05-30-2007, 04:06 PM   #8
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thanks for (finally) getting it to me. cuz you know I need it n all.

I done ordered me some ngk zfr7f-11 . They are extended reach heat range 7. Which is the coldest ngk copper plug I could find that would be correct for the miata. They cost about $.25 more/each compared to the bkr7es-11.

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Old 05-30-2007, 04:27 PM   #9
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Quote:
Originally Posted by Ben View Post
thanks for (finally) getting it to me. cuz you know I need it n all.
dont you ahve 10 other miatas that can make use of it?
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Old 05-30-2007, 04:43 PM   #10
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no. I have 1 running miata, 1 miata carcass with a few parts left, and 1 extra miata engine.

I've had a 96 and an 90 in the past.
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Old 05-31-2007, 08:31 PM   #11
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OK, no detonation with the ngk zfr7f-11 plugs on a WOT pull through 1-4, and most of 5. Had the a/c on too.

Brain, might be good to put that part # in your faq.
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