[s-cars] Re. Spark plug

[qshipq at aol.com]

 IME with iridiums, 60k is a reasonable CI, likely more, especially on a stock application.  NGK went after 200k CI target on normally aspirated cars.  I would agree that the hiccup is not a spark plug problem if you swapped and have the same problem.  The coppers will have lower spark fire voltage, but IME with coppers in turbo apps, 10k is about my comfort limit in terms of wear.  Copper wears very quickly in turbo applications....  I'd put the iridiums back in, you were less than half the service life when you took them out.

To the comments about platinum being 'cheaper' that iridiums, that's because iridium/rhodium is more expensive in both raw material and manufacture than platinum.  The material also lasts twice as long as platinum in the combustion chamber, requires less voltage to fire, and will fire under lean conditions better, so the cost per mile on the plug comes out less...   if you do the math.

Cheers

Scott J



 


 

 

-----Original Message-----
From: Wylie Bean <theringmeister at triad.rr.com>
To: qshipq at aol.com
Cc: S-CAR list <s-car-list at audifans.com>
Sent: Tue, Dec 14, 2010 11:07 am
Subject: Re: [s-cars] Re. Spark plug


So in my case, where I installed a set of NGK BKR7E coppers (replaced 30K mile 

NGK BKR7EIX iridiums) doing some troubleshooting of a random "hiccup" under load 

(which is still ongoing) in an unchipped AAN, what do you suppose the change 

interval would be, or should I just pull them and switch back to Iridiums?



  

Wylie Bean

TheRingmeister at triad.rr.com

90 cq

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