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Old 04-06-2009, 09:57 PM   #21
flycaster
Scooby Specialist
 
Member#: 60142
Join Date: Apr 2004
Location: Bend, OR
Vehicle:
2011 WRX
Grey

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Quote:
Originally Posted by n2oiroc View Post
no way. beaten like they should be, i would guess 50,000 tops before the rings start to wear hard.
That's a good guess - if you put 2618 slugs in and set them to the usual amount of clearance (.003 - .004"), there's no way you're going to get stock-like cylinder/piston/ring wear. Every time you warm them up the pistons wobble around until they get hot and swell. That's simply the trade off for having pistons that are far more tolerant of abuse (i.e., detonation).

FWIW, I have a little over 40K on my $4K Cobb motor. It still runs great, makes beacoup power, and has good compression...but it is starting to burn more oil and the leakdown loss is, slowly, starting to go up. I figure maybe another 15K miles, 20K if I'm lucky, and then I'll have to make the decision to either rebuild/replace it and rebuild the heads, or move on to a different car.

Having said that, I'd do it exactly the same way all over again. The loss in longevity is worth, imo, the substantial increase in strength and ability to withstand the inevitable "uh oh." Simply put, I knew it was going to wear faster, but I also knew it wasn't going to catastrophically break and leave me stranded out in the boonies somewhere. The old "pay to play"...end of story.
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