What is the number for the copper racing plugs?

Thanks
\rlr

 

Spark plug heat range is pretty much entirely horsepower and intake temp dependant. Going too many steps colder will only give you plug fouling and poor performance compared to a plug in the correct heat range when the engine is not WOT and being driven daily.

 

Look at the picture. The box is above the plug.

 

i broke 2 denso plugs trying to gap them...they're a b*tch to do. look forward to your report dave

 

I change my NGK racing plugs at least once a month. I do feel a big difference when the are fresh. Power feels much smoother.

 

Steve thanks for reminding me about this. Using the plug gapper and gauge, I found that the negative electrode on the Densos were really hard and too slippery and the gapper did not grab it well to open the gap. Here is a blurry pic of my gapper:

There are better gappers on the market but I haven't acquired one yet.
I used some strong needle nosed pliers to open the gap and that gapper to close the gap when needed. It seemed to grab it fine when closing. Doing it this way, I was never pressing on the center electrode, which I assume, is what is the most delicate.

So far, it's been about a month since putting these plugs in and they have been performing flawlessly. I plan to pull them soon to see how their doing. However, I can't honestly say that they give any more (or less) power. They perform about the same for me as did the OEM platinums and the copper racing plugs. I'm hoping with these plugs, that I won't need to think about replacing them for a very long time.

 

I was running a set of IK 24's w/ my NA setup for apprx 15,000 when they caused my engine to misfire and throw a cel...just keep a close eye on them.

 

If you're considering the Jacob's Electronic plug gapping pliers that Summit Racing sells, http://store.summitracing.com/partdetail.a...N=110&view=4095
you would probably be better off sticking with needle nose pliers and a gap gauge. I bought the pliers to give them a try and ended up breaking two plug tips with them. The pliers are very cheesy and poorly designed. They use a disc with a graduated edge, like the pocket gappers sold in most auto parts stores for under a dollar, and the instructions advise that a standard feeler gauge should be used to re-check the gap of the plugs after gapping them with the pliers.
The pliers aren't worth the $40 price tag and they're not worth the hassle in my experience.

Dean

 

Dean, thanks for the heads up and for being the Guinea Pig. I looked at those and decided that the design was not condusive to safe gapping. I guess I'll just stick with the needle nosed pliers.

 

No problem, I figured that one of us should take the leap and give them a try. Do you want to buy a slightly used set of gapping pliers? They were only used once by a little old man in Florida to break... errr, I mean gap two spark plugs.

Dean