Originally Posted by xixixi
Rob, would you mind sharing what plugs you plan on running with your nitrous setup and how much you will be spraying? I'm using NGK BKR7EIX 2667. thanks
I too will be running the NGK BKR7EIX 2667, but.......
Nitrous guys in the know tell me that in extreme conditions like detonation, the welded on Iridium tip can fail. If & when this failure happens the tip may separate from the plug, needless to say that would not be good for that cylinder/motor. With this said, keep in mind the vast majority of nitrous users report no problems running Iridium plugs. The best overall bet though may be a cheap Copper (not aluminum) core plug with a single ground strap. Then the standard length ground strap is cut down to make it shorter, so now it's off to the side of the electrode; instead of on top of it. Plug gap somewhere between .025 to .028, and of course one step colder than stock. Keep in mind that different manufactures use different ratings (higher or lower numbers) to determine hot or cold plugs. So with a NGK plug, the next higher number from stock is "colder". With an Autolite plug, the lower number from stock is colder.
This statement is from the owner of Wizards Of Nitrous (W.O.N.)
"RULES for plugs;
1) ALWAYS use NGK
2) ALWAYS buy the cheapest
3) You can then afford to buy a few spares and change them if any look different to the rest
4) NGK are without doubt the best brand available but even they accept a ONE IN THREE failure rate, so in any set of 4 plugs you potentially have 2 faulty ones.
5) Faulty plugs do not always show up under normal use or in the form of a misfire, plus it takes an exceptional person to detect an 'occassional' misfire at high rpm anyway.
6) If in doubt, CHANGE ANY plug that looks different to the rest
7) If you've tried everything else and still don't get the performance you expected, change ALL the plugs, because they can 'APPEAR' to be perfect and yet still be inadequate, especially for nitrous.
BTW no matter what you pay for plugs there is NEGLIGABLE difference in performance and the only advantage of expensive plugs is that they 'SHOULD' last longer.
Trev (The WIZARD of NOS)
30 years of nitrous experience and counting"
This statement is from a nitrous user posting on the same forum.
"IMO I'd steer clear of Iridium plugs. The Iridium tips are welded on & can & do fall off under det! They have claimed a few high ££££ engines in the past I know of & I had a very close call with a Denso Iridium plug after a very small amount of det on a dyno tuning session.
Copper core NGK's all the way for me & everyone I know that's seen the damage cause by Iridium plugs!
In the end, this is not meant to scare anyone running Iridium plugs, I've personally (Rob43) been running them for years with zero problems. In extreme situations like detonation, A LOT of other bad things can happen before an Iridium tip ever breaks off.