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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > M3 Spark Plugs in N20 F30?
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      07-27-2015, 12:10 PM   #1
Marshalltj
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M3 Spark Plugs in N20 F30?

I have decided to replace my BOV with the GFB version. It's on order and should be here in a week or two. I have also read about the cooler operating temps of the M3 plugs and how these cane be a good idea for engines running a tune. What are the part numbers for these plugs? And, are BMW plugs or an after market version recommended?
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      07-27-2015, 04:56 PM   #2
Stubok
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They are BMW plugs.

Here are the part numbers for the coils and plugs for the stock N20 (F30-328i) and S55 (F80-M3) engines. Notice the Coils are the same.

Part #
N20 Coil 12138616153
S55 Coil 12138616153

N20 Spark plug 12120039664
S55 Spark plug 12120039634

I actually just changed mine yesterday.

I found that the gaps are the same, well at least on my autozone sparking gap tool. I had 0.7mm (about 0.03").

The existing plugs didn't seem bad at all after 10,500miles. so not sure if it worth changing them. That said I only just started tuning the engine (GSR Flash Tune), so maybe it will help in the long run. I haven't tested things yet, so I cant tell if there is any impact on performance.

Last edited by Stubok; 07-27-2015 at 07:41 PM.
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      08-01-2015, 11:31 PM   #3
SergioK
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Key point when changing plugs on the N20:

If you notice, the coil 'tunnel' is at a different angle than the spark plug. If you use a regular socket extension you'll find that it will almost make contact at the top of the wall of the engine. The recommendation I've heard is to put a swivel on the spark plug socket so the sparkplug is torqued down evenly instead of kinked. Apparently the ceramic, and internals, on the stock N20 plugs are very fragile and the plugs can easily fracture (internally or the ceramic itself). In addition, overtorquing the plugs can also lead to internal fractures.
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      08-02-2015, 01:22 PM   #4
Stubok
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If you have a thin 5" extension you can do it straight. But yes maybe a universal joint would be a good idea.

The plug boxes say 23Nm +/-3Nm.

Which is surprisingly low, but it works.
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