Iridium Spark Plugs, $6.95?!

[EvilBetty]

I just got back from Advanced Auto Parts (Parts America) picking up spark plugs.  The NGK Iridium plugs were a chore to track down around here, but they said they had them in stock and the website said they were $12.99 ea.

http://www.partsamerica.com/ProductDeta ... pe=&PTSet= (http://www.partsamerica.com/ProductDetail.aspx?MfrCode=NGK&MfrPartNumber=DPR8EIX9&PartType=&PTSet=)

When I was read my total, I paid and ran for the truck feeling like I had stole something, but they had rang up the plugs for $6.95 ea.

When I got home I was freaking out because it looked like the coil contact end was missing off two of them, but I noticed it unscrews off the third.  I went back and looked at the old ones and sure enough the only have the threaded end on them too.  I've never seen such a thing.  How does that make clean solid contact inside the coil?

[Mustang]

there is a little spring clip in the connector that locks onto the threads  

[DaJudge]

You don't need the screw-on sleeve that you'd normally use on auto plugs.  The end of the coil assembly is made to connect to the smaller threaded contact on the plug. 8)

[EvilBetty]

Thanks for the info guys :)

[EvilBetty]

Those Iridium electrodes look a little delicate.  Is it ok to use a normal spark plug gapper to set the gap?

Oh and what is the correct gap on these?

[EvilBetty]

I can't find the the torque spec for the plugs in the manual anywhere.  Anyone know what it is?

[Kiwi Tiger]

Stock for my Girly
NGK DPR 8EA-9    0.031 TO 0.035in

[EvilBetty]

Apparently from what I've found you're not supposed to gap the Iridium plugs, but I did finally find in the manual the stock plugs should be gaped to 0.9mm.

But I could not find a torque value anywhere for the plugs.

[Kiwi Tiger]

nip it up, then 1/4 turn