well mazdatrix says .025 for the br10eix's. not sure if it would be the same for those or not.

I don't advise this. Don't use platinums over standard plugs, especially if you have or are using any kind of methanol in the charge. Very bad idea.

B

NGK BUR7EQ, BUR9EQ, R6725105, R6725110, R6725115 -- those are the plugs FC guys need to run. FD guys can use the B10EGV's that are using the PowerFC but that is a pretty cold plug for the street. The issue of having a resistor-type plug for use with the Haltech and Microtech setups is critical from what I understand as there's a potential for a noise problem interfering with the trigger. This is for street cars.

For anything over stock boost/stock power levels, absolutely do NOT use BUR7EQ's in the leadings. Swap them out for 9's.

Road-race guys who are seeing lots of load for 20+min at a time need a substantially colder plug; atleast 11's all around.

The issue isn't horsepower per se as that's a fallacious way to rate the use of plugs but rather is an issue of load and more-so chamber temperatures. Try those same warmer plugs on a road-race course and you'll see them be much more prone to turn into glow-plugs. Those that use AI with alcohol/water can get away with using a hotter plug as the chamber temperatures are (usually) much lower compared to gasoline-use only.

Get a stout enough ignition system and you can use colder plugs that won't foul. Bang, bang!

Spark-induced misfire due to a glowing spark plug is brutal and can be fatal to a rotary. I've seen it three times.

B

Platinum 9's all the way around are fine. Every car that leaves here uses them and I have probably sold 1000 of them.

You talking 'bout me? :biggrin:

... and they're a waste of money. Infact, with the use of methanol, they can be detrimental.

B

methanol cars cannot run the standard NGK "multi ground" plugs. you need a single electorde plug

hmmm.....same with other forms of AI? Any links to some good reading on the subject?

this only appies to full complete methanol based injection (not gas + light alky/methanol inj)

ahhhhh sorry. Anytime I hear BDC say meth I presume he's talking about meth as a form of AI.....

oops! :lol: