spark plug gapping
Joined: Mar 2003
Posts: 6,505
Likes: 49
From: Sellersburg, IN
I run the NGK BKR7E(very good plug for forced induction) with a gap of .028", am at 6.2 psi right now conservatively tuned, and put down 331 whp and 217 lbft of tq.
I wouldn't gap any more than .032" on any forced induction and risk miss firing if I were you.
I wouldn't gap any more than .032" on any forced induction and risk miss firing if I were you.
) 
Joined: Oct 2000
Posts: 9,033
Likes: 21
From: South of the pier, Huntington Beach, CA
Some bad info in this thread. 
A gap to large will not cause pre-ignition and the knock sensor doesn't come into play.
Bad plugs or a gap to large for conditions causes misfire, a failure to ignite.
Proper gap is important with a supercharged S2000 and that is why the thread starter asked for experienced advice.
Originally Posted by robert112
you think a few misfires is going to cause dents in the s2k's forged pistons? s2k's have knock sensors anyway it'll automatically retard the timing.
This is coming from experience. I had a 12 second s13 and getting the right sized gap is important.
This is coming from experience. I had a 12 second s13 and getting the right sized gap is important.
Bad plugs or a gap to large for conditions causes misfire, a failure to ignite.
Proper gap is important with a supercharged S2000 and that is why the thread starter asked for experienced advice.
Thread Starter
Registered User
Joined: Jul 2003
Posts: 7,840
Likes: 1
From: socal
Originally Posted by 9kFever,May 11 2006, 12:18 PM
what are the NGK 7405 series? all my research pointed me towards the 7173 copper racing plugs...
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Joined: Apr 2006
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Originally Posted by Sideways,May 11 2006, 01:41 PM
Some bad info in this thread.
A gap to large will not cause pre-ignition and the knock sensor doesn't come into play.
Bad plugs or a gap to large for conditions causes misfire, a failure to ignite.
Proper gap is important with a supercharged S2000 and that is why the thread starter asked for experienced advice.
Originally Posted by robert112
you think a few misfires is going to cause dents in the s2k's forged pistons? s2k's have knock sensors anyway it'll automatically retard the timing.
This is coming from experience. I had a 12 second s13 and getting the right sized gap is important.
This is coming from experience. I had a 12 second s13 and getting the right sized gap is important.
Bad plugs or a gap to large for conditions causes misfire, a failure to ignite.
Proper gap is important with a supercharged S2000 and that is why the thread starter asked for experienced advice.
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Joined: Jun 2005
Posts: 1,260
Likes: 0
From: Colorado Springs
Originally Posted by Spoolin,May 11 2006, 01:26 PM
I run the NGK BKR7E(very good plug for forced induction) with a gap of .028", am at 6.2 psi right now conservatively tuned, and put down 331 whp and 217 lbft of tq.
I wouldn't gap any more than .032" on any forced induction and risk miss firing if I were you.
I wouldn't gap any more than .032" on any forced induction and risk miss firing if I were you.
