Spark Plug Question

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Jul 2, 2003 | 03:32 PM

easterisland

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Joined: Jul 2001

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From: Nashville

Spark Plug Question

I was doing a search and came up with this page.
I don't think these are correct are they? It says BR7EF's are one heat range colder than stock. I thought BR7EF's were about the same heat range as Denso IT-24's...

Jul 2, 2003 | 03:59 PM

soap

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Joined: Sep 2001

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From: Motor City

I agree with what your sayin........I thought TR-6's were 1 range colder.

EDIT........

Notice it says "with .750 thread depth"..........which I doubt we have.

NGK

PART# / HEAT RANGE

TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Cooler

PART# / HEAT RANGE w/ .750 THREAD DEPTH

R5671A-7/ 4091/ Stock Heat range
BR7EF/3346 / 1 Step Cooler
R5671A-8/ 4554/ 1 1/2 Steps Cooler
R5671A-9/ 5238/ 2 Steps Cooler
R5671A-10/ 5820/ 3 Steps Cooler

--Joe

Last edited by soap; Jul 2, 2003 at 04:28 PM.

Jul 2, 2003 | 04:17 PM

cyntaxx

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Joined: Apr 2002

Posts: 5,298

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From: here

Hmm I've been wondering that myself. Should I go with TR6s with a 4# and 75 shot or BR7s?

Jul 2, 2003 | 06:22 PM

1BADTK

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From: President HALO

BR7EF's are shorter than TR6 so they must be colder. Just look at the tip depths, you will see the difference. This way you don't need to be guessing.

Jul 2, 2003 | 06:33 PM

georgia-SVT

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Joined: Jan 2003

Posts: 414

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From: Valdosta Ga.

NGK Heat range!!!!

The stock NGK plug is a TR5 any "7" heat range is two colder than stock.I and bkr7e plugs in my SC Miata but you could use the bkr7e11 only difference one was .35 and the other was .43
Jeff

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