brad8266

iTrader: (23)

I pulled one of my plugs out, its a NGK TR6. It had a V groove in the end on the center metal thing, cant remember the proper name of it right now. Anyway anyone know why the hell it has a V groove in it, I pretty damn sure it wasnt there when I bought them. Could this be from detonation or anything else I should be worried about? I run a 150 wet shot.

blkbird_WS-6

iTrader: (14)

I'd have to go pull one out of the car to be sure, but I'm almost positive it has a V groove already .

Airwolf

iTrader: (2)

Pretty sure my last set had the groove.

brad8266

iTrader: (23)

Thanks guys, I cant believe that I didnt remember that. Well then that means my plugs are in excellent shape even through all the bottles that went through them. Apperciate the help.

brad8266

iTrader: (23)

Yeah the groove is nice and smooth as well, like it was made that way. Stupid me.

Robert56

iTrader: (2)

Cat3 is our plug guy, but here goes. the V-groove is for flame propagation. In other words to give a wider/larger flame front to ignite fuel mix more effiecently. I don't claim to be a plug expert, but I think that's the jist of it.
Robert

GREATWALLTA

Those are call NGK TR6 V Power plugs, kind of like split fire type plugs. And yes they should be stock and not from detonation. Don't worry about it pull another one out and it will look the same.

bad0211secws6

iTrader: (6)

i just got a set of the ngktr6ix iridium.i have the tr55 now but the ends keep unscrewing after 3000 miles gets real fu$#ing annoying the iridiums dont have a screw on cap i like them much better!

CAT3

iTrader: (9)

For the screw caps, I ALWAYS hold the plug with a wrench or socket (but plug in upside down) and tighten the cap with a pair of pliers, carefully to not deform, but very tight. If not, the cap will cause the plug to lose its efficiency and thus misfire pronation begins.
V-Groove = excellent plug, way more efficient than the Split fires. IX series NGK very nice, and cheaper then the Denso's.