Tell me about my spark plugs - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

solo_ryder · 02-11-2013, 10:40 AM

s14 sr20det.. I have had the motor sitting in my house. Pulled the plugs and they are pretty black. Not wet though, just looks like it was running rich, gap seems big and the are NGK R irridium 8's (shouldnt they be 7's?)

Thoughts?

jamg · 02-11-2013, 10:44 AM

Use copper plugs

solo_ryder · 02-11-2013, 10:49 AM

Ok, what kinda heat range should I go with? this will be a DD, might up the boost to 10-12psi. Stock everything, BB s14 turbo, arc sidemount

AdamR · 02-11-2013, 04:25 PM

Iridium are better. By those are too cold, and they look it. Get some 7s.

Croustibat · 02-11-2013, 04:33 PM

Iridiums last longer, when they dont get drenched in fuel. They may be 0.00000001% better as the electrode is smaller, but considering their price, it is just not worth it. get grade 7 coppers, 4 for 15$ or less. The irridium version will cost at least 60$.

BTW you want to setup the gap correctly, 0.8mm or smaller should do the trick. They usually come gapped at 1.1mm .

solo_ryder · 02-11-2013, 04:42 PM

Thanks for the advice guys, any ideas why the plugs look they way they do? Any sign of oil burning or does this look like a cold plug/rich condition?

jamg · 02-11-2013, 05:30 PM

Copper will melt before it puts a hole in your block. That's why I'm using them. Just in case...

AdamR · 02-11-2013, 05:51 PM

Quote:

Originally Posted by jamg

Copper will melt before it puts a hole in your block. That's why I'm using them. Just in case...

What?

Op, the plugs look too cold.

ForeignMuscle · 02-11-2013, 06:06 PM

Quote:

Originally Posted by AdamR

What?

Op, the plugs look too cold.

jamg is right.

In the event of a super lean condition in which the electrode could be melted the iridium could possible break free of the plug and beat the shit out of the pistons and combustion chamber. Copper will burn up without hurting the top end.

OP, you need p/n: BKR7-ES copper NGK plugs.

If your mixture is right and your engine is running efficient the plug will have an ash color to it. Not to white, not to dark either. Just google some pictures to help you read the plug.

solo_ryder · 02-12-2013, 02:32 PM

Thanks. I'm gonna pick up some coppers soon

*fliprayzin240sx* · 02-12-2013, 07:18 PM

BCPR7ES or BKR7ES...gap them down to .030

AdamR · 02-19-2013, 08:38 AM

Quote:

Originally Posted by ForeignMuscle

jamg is right.

In the event of a super lean condition in which the electrode could be melted the iridium could possible break free of the plug and beat the shit out of the pistons and combustion chamber. Copper will burn up without hurting the top end.

OP, you need p/n: BKR7-ES copper NGK plugs.

If your mixture is right and your engine is running efficient the plug will have an ash color to it. Not to white, not to dark either. Just google some pictures to help you read the plug.

That may be true, but I have never seen an electrode break and cause issues. I have always seen the ground strap break off. It isn't made of copper or iridium.

02-11-2013, 10:40 AM	#1
solo_ryder Zilvia Junkie Join Date: Mar 2011 Location: The True North Posts: 529 Trader Rating: (18) Feedback Score: 18 reviews	Tell me about my spark plugs s14 sr20det.. I have had the motor sitting in my house. Pulled the plugs and they are pretty black. Not wet though, just looks like it was running rich, gap seems big and the are NGK R irridium 8's (shouldnt they be 7's?) Thoughts?

02-12-2013, 07:18 PM	#11
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	BCPR7ES or BKR7ES...gap them down to .030 __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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02-11-2013, 10:44 AM	#2
jamg Nissanaholic! Join Date: May 2009 Location: GA Posts: 2,106 Trader Rating: (7) Feedback Score: 7 reviews	Use copper plugs

02-11-2013, 10:49 AM	#3
solo_ryder Zilvia Junkie Join Date: Mar 2011 Location: The True North Posts: 529 Trader Rating: (18) Feedback Score: 18 reviews	Ok, what kinda heat range should I go with? this will be a DD, might up the boost to 10-12psi. Stock everything, BB s14 turbo, arc sidemount

02-11-2013, 04:25 PM	#4
AdamR Leaky Injector Join Date: Jan 2008 Location: Owensboro, KY Age: 37 Posts: 134 Trader Rating: (0) Feedback Score: 0 reviews	Iridium are better. By those are too cold, and they look it. Get some 7s.

02-11-2013, 04:33 PM	#5
Croustibat Nissanaholic! Join Date: Aug 2011 Location: France - Toulouse Age: 41 Posts: 1,851 Trader Rating: (0) Feedback Score: 0 reviews	Iridiums last longer, when they dont get drenched in fuel. They may be 0.00000001% better as the electrode is smaller, but considering their price, it is just not worth it. get grade 7 coppers, 4 for 15$ or less. The irridium version will cost at least 60$. BTW you want to setup the gap correctly, 0.8mm or smaller should do the trick. They usually come gapped at 1.1mm .

02-11-2013, 04:42 PM	#6
solo_ryder Zilvia Junkie Join Date: Mar 2011 Location: The True North Posts: 529 Trader Rating: (18) Feedback Score: 18 reviews	Thanks for the advice guys, any ideas why the plugs look they way they do? Any sign of oil burning or does this look like a cold plug/rich condition?

02-11-2013, 05:30 PM	#7
jamg Nissanaholic! Join Date: May 2009 Location: GA Posts: 2,106 Trader Rating: (7) Feedback Score: 7 reviews	Copper will melt before it puts a hole in your block. That's why I'm using them. Just in case...

02-12-2013, 02:32 PM	#10
solo_ryder Zilvia Junkie Join Date: Mar 2011 Location: The True North Posts: 529 Trader Rating: (18) Feedback Score: 18 reviews	Thanks. I'm gonna pick up some coppers soon