qwiketz

I've heard that they can help with spark blowout. Anyone use them? I'm running champions right now but am thinking of changing them out.

Mekanic

I run NGK Iridium on my DD and my truck, and plan on putting them in the vette next weekend. They're about half the price of Denso.

I like the, a lot on those apps, although neither are FI, I could feel some SOTP in the truck, may have just been new plugs and wires but who knows.

Mo_Bandy

NGK iridiums here too...

Mo

JLeatherman

I worked at a company over the summer that builds airplanes. They had some of the Denso Iridium plugs and they are an amazing plug. THey are superbly made and definitely run a hotter spark. However, I'm not really sure if they would help you with your spark blowing out. What gap and boost are you running that your plugs are getting blown out? The Denso plugs are very expensive ($30/plug for some applications) so you may want to try cheaer options first.

qwiketz

I'm currently running champions gapped at right around .035. I could tighten them up a bit, but then again, I heard the denso's are a great plug and might consider swapping them out. The denso's have that .4mm tip which is supposed to be more resistant to blow out since the spark is more focused on a smaller area. My car's hp is peaking at 4400rpm according to datamaster. With a centrifugal and good heads, something is definately up which is why I suspect blowout. I'm currently running 10psi, but that's going to change to about 14lbs real soon.

lcvette

I tried 3 different plugs, autolite 106's, NGK TR6, and NGK TR7ix (iridiums) at 20+ psi gapped at .028" the iridiums never missed a lick and held up to very rich tuning conditions without fouling.. I am SOLD on iridiums even given their high price tag of about $9 per plug.. they will outlast the std plugs available and are happy with boost unlike the platinums! I imagine the Denso Iridiums in the same heat range will do just as well!

Chris

STL94LT1

I run Denso's in my car and truck with great success. Also, the truck is running 15lbs of boost.

qwiketz

Chris, do you have the part number that you're running for the plugs?

tjwong

I use iridium plugs in all my LSx car and truck applications. In fact in some instances I will see misfire counts if I substitute an iridium (factory fill) for a standard type plug. Off all the weird spark plug gimmicks, the fine wire iridium plug design actually works.

vettetwinturbo

When I had the last SBC TT in my Vette making 750+ RWHP at 28psi we had some problems w/sprk blowout at high RPM (--along w/a multitude of other tech problems!) Right now I run Denso Iridiums in my 2JZ making 800+ RWHP at 22-30psi. Never had a problem with spark blow out by narrowing the gap slightly. Only downfall is a very small loss of power (maybe 5 hp in mt app). Plan on using them in my new Dart Little M SBC TT package as soon as I get it into my Vette.

BAM92

Mo_Bandy

I'm running AFR heads so mine requires the gasket type.

I'm running BKR7EIX stock number 2667

If you go to www.NGK.com they have a cross reference... Also look into the NGK411 area it is helpful to understand the plug number break down. They also show the "NGK" numbering system.

The only difference in the plg would / should be that you may be using taper rather than gasket.

Hope this helps..

MO