Often times, someone will do something that works, others will follow and it becomes "gospel". However that does not always mean that what everyone is doing is the optimum.

One of the things that many people will suggest is running BKR8EIX plugs at the NGK supplied gap of 0.026", people will say things like "you need the small gap to avoid spark blowout" and "you can't gap irridiums".

Well, I decided that seeing as Honda thinks you should gap your plugs to 0.040", which is quite a bit larger I would give it a try.

I would love to say I have before and after dyno plots showing fantastic gains running the plugs with the larger gap but I do not. What I can say is that the car runs great with the plugs gapped to 0.040" and if you can run a larger gap without any issues (blowout etc) I can't see how this could possibly be bad. Longer spark, larger flame front, better burn.

Just some food for thought

 

Try running 20psi on E85 with a .040" gap.

 

I need a .25 gap or the car starts running like poop

Sent from my SPH-D710 using Tapatalk

 

TJ is right at higher boost that is not going to be the case and unless you have verified this on the dyno I would not be so sure it is working properly. If you are running lower cylinder pressure respectivly the spark can jump but the greater the air density in the cylinder the harder it will be for the spark to jump.

General rule of thumb is larger gap = more complete ignition but with the side effect of better chances of no igintion. IE. ignition breakup seen in many boosted cars.

 

I gap my spark plugs at .018-.019

 

Who says you can't gap Iridium plugs, NGK even has a how to page just for Iridium plugs.
https://docs.google.com/viewer?a=v&p...QwMjc1OQ&pli=1

ROD

 

Agree completely that a lot of you guys pushing big numbers may need a smaller gap.

I'm trying to break the consensus there seems to be that if you run ANY kind of FI you should immediately run a lower gap and not even experiment.

 

I agree, it's a part of tuning especially with different compression ratios and aftermarket coils and/or ignition systems. Just staying with the status quao doesn't always means its going to be the most efficient for your particular setup.

 

You want to run the largest gap possible with out spark blow out. I personally run my gap at about .024. This is on Ly 17psie85 500whp tune. Any larger of a gap the spark will. Blow out and the car will not run.

I'm sure you pump gas/ low boost/lower hp guys can run a much bigger gap

 

tried .035 worked for a month, then started to get misfires I lowered gap to .025 been fine ever since