After plenty of searches, there still is no consistent answer for gapping NGK coppers. Some people say to gap them to .051 inches or 1.3 mm, while others say that you throw the plugs in the way they come, and throw them out AFTER they reach 1.3 mm. Can any of the honda gods enlighten me as to the truth ???

 

Why dont you just get out your helms manual and look what the plugs are supposed to be gapped to?

 

Good idea; If I had one.

 

Get the pdf helms version. Do a seach

 

they are suppose to be pre-gapped from the factory but sometimes they are out of spec and it wouldn't hurt to check anyways. so check them. O, btw...don't gap iridiums.

 

Under my hood, there is a diagram that says Honda plugs are supposed to be gapped at 1.1mm....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Vap133 &raquo;</TD></TR><TR><TD CLASS="quote">Under my hood, there is a diagram that says Honda plugs are supposed to be gapped at 1.1mm.... </TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Vap133 &raquo;</TD></TR><TR><TD CLASS="quote">Under my hood, there is a diagram that says Honda plugs are supposed to be gapped at 1.1mm.... </TD></TR></TABLE>In my '95 Integra Helm shop manual there's a page that says 1.1mm for the B18B1 engine and 1.3mm for the B18C1.

 

Always gap new plugs, never just put them in..

The pre gapping crap they tell you is wrong..

 

.051 (1.1mm I believe) is the correct gap. Under most honda hoods they say that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">In my '95 Integra Helm shop manual there's a page that says 1.1mm for the B18B1 engine and 1.3mm for the B18C1.
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Here's your answer.

What model are the plugs you have? Some come pre-gapped and some don't have the "gap" designation in the model #. IE, there is a BKR7E-11 and a BKR7E. The last # denotes the gap, 1.1mm.

 

thats great for stock engines, what about gap#'s for engines with diffrent internals?i dont gap the plugs i just throw them in there.. i use bkr7e-11

 

.037-.038 are some magic numbers.

 

i have a stock jdm gsr motor and had my plugs gapped to .050". today i changed the gap to .040" and there was a drastic change in available power...... before the engine lagged and would not pull past 7k rpms.... now it pulls hard all through the power band. my idle is also much more stable......... something to do with the high compression blowing out the spark................. just my experience.

 

If the last 2 numbers designate the gap size, then that means every body with b18c1s should be running a 1.1 mm gap because the NGK spark plug model number that most people run here for their GS-Rs is BKR6E-11. I mean does the .2 mm really make that much of a difference ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eclipse spanker &raquo;</TD></TR><TR><TD CLASS="quote">If the last 2 numbers designate the gap size, then that means every body with b18c1s should be running a 1.1 mm gap because the NGK spark plug model number that most people run here for their GS-Rs is BKR6E-11.</TD></TR></TABLE>The owner's manual for my '95 GS-R says NGK PFR6G-13 or Nippondenso PK20PR-13 plugs. Those are Platinum.

BKR is a copper plug, right? If you want to use Cu, the only difference between BKR6E-11 & BKR6E-13 is the gap. If you can't find BKR6E-13, then all you have to do is adjust the gap.

 

cool, thanks guys

 

i usually set my gap to .044" it works fine in my ls and i find that i get the best performance with this gap on my engine

 

I wish I knew what the gap differecnes were though...I mean what does the gap length actually affect ?

 

1.1mm = 0.043"
1.3mm = 0.051"

A bigger gap makes a bigger spark, but it takes more voltage to start the spark. But the air gap takes even more voltage when the pressure's higher. So I expect boosted engines whould need a smaller gap so they don't misfire at high boost? I don't really know why B18C1 takes such a big gap since it's got a little(?) higher stock compression ratio?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JimBlake &raquo;</TD></TR><TR><TD CLASS="quote">
I don't really know why B18C1 takes such a big gap since it's got a little(?) higher stock compression ratio?
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It may be related to combustion chamber design?