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Old 09-12-2003, 02:16 AM   #1
gtwagon941
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2014 Audi S Q5

Question NGK Copper Spark Plugs

I need the part number for the NGK plugs that are appropriate for my 98 GT. I want the COPPER plugs, NOT the platinum or iridium or anything else. I have them on the car right now but I can't find the part number anywhere online and I don't really want to go to the trouble to pull a plug to get the number if I can't get the plugs right then to finish the job.

Thanks in advance.

Jared
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Old 09-12-2003, 05:57 AM   #2
richeich
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I'm running the BKR5E-11 on mine. NGK stock no. 6953 (they seem to find them quicker on the shelf with this number).

I think that's one step colder than what's actually the correct 'factory' plugs. So the right one would be actually a BKR6E-11.
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Old 09-12-2003, 08:46 AM   #3
Legacy777
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yes the 6 ones are the ones you want.

If you run 5 and don't have some serious mods to warrant them, you will hinder performance, mileage, etc.
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Old 09-12-2003, 03:35 PM   #4
gtwagon941
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thank you both. I just picked em up at Napa for under 6 bucks.

Now I only hope my brother shows up with the tools.
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Old 09-15-2003, 10:55 AM   #5
DerFahrer
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Don't know if this is too old, but I suggest gapping the plugs right in the middle of the specified range, for a stock setup. I have found this to work best with my 1991 Legacy.

Too small of a gap will cause misfires, knock etc. because the spark won't reach the a/f mixture, but too big of a gap will cause misfires because the spark will get blown off the electrode by the intake charge...
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Old 09-15-2003, 02:17 PM   #6
2.5GT
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Default Wrong info!!

richeich, you might wanna change out your plugs to a BKR7E-11, if you want a COLDER plug. NGK numbers their series different than other manufacturers so that the HIGHER the number, the COLDER the plug. You're actually running a HOTTER plug than stock!!

I'm running the BKR7E-11 on my turbo legacy.

See here:

http://www.extrememotorsports.com/plugfaq.htm

Here's a typical NGK spark plug part number: BPR6EVX-11.


A quick run down of the part numbers. Each letter or number has significance in the NGK part number, but the same letter may hold a different meaning depending on where it is placed. Here is a rundown of our part number:

B Thread diameter = 14 mm
P Construction = Projected Insulator Type
(K) Construction = Hex size 5/8 in, projected tip
R Construction = Resistor Type
6 Heat Rating Number = 2 Hot -> Cold
E Thread Reach = 12.7 mm
S Firing End Construction = Standard 2.6 mm diameter center electrode
(VX) Firing End Construction = High performance platinum
(K) Firing End Construction = 2 ground electrodes
(N) Firing End Construction = Special side electrode
(-11) Gap Width = 1.1 mm (0.044 in)


As you can see, our heat rating number goes up as speed, load and temperature go up. In other words, higher numbers are colder plugs. A colder plug simply has a better ability to cool itself. When combustion chambers become more violent (higher temps) due to aftermarket toys, the plug sees higher temperatures approaching its critical temperature (~900 degrees C). To avoid plug failure (burning away ground / center electrodes, or just increasing the plug's gap) some people must go to a colder plug.

The reason we cannot use a colder plug from the outset is fear of never getting the plug warm enough. A spark plug must reach what is called its "self-cleaning temperature" (or region) which generally occurs at about 500 degrees C depending on the A/F ratio. This is normally reached during high engine or vehicle speeds. This "self-cleaning temperature" allows the plug to burn off carbon deposits accumulated at lower speed and idle conditions. If this temperature is not consistently reached, you will have definite fouling problems.
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Old 09-15-2003, 04:16 PM   #7
richeich
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Heh, heh. Well... hell.

I was going to switch them out pretty soon anyway. I'll just put the right ones in. I haven't had any problems, but there's no reason to hurt performance with the wrong plugs.

Thanks-
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Old 09-15-2003, 06:15 PM   #8
White2.5GT
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Hrmm...

The plugs that came out of my 1998 2.5GT were NGK R PFR5B-11 (plats) and I replaced them with BKR5E-11 (Copper)

These should be the same heat range right? Stock listed in the Manuel was NGK heat range 5.
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