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Old 06-17-2019, 12:12 PM   #7
Scooby Newbie
Member#: 363007
Join Date: Jul 2013
Chapter/Region: MWSOC
Location: MO
2008 STI


Originally Posted by BlackFighter View Post
Anyway you can stick a clean rag in the hole and hope to get some of those "particles" stuck to the rag so you can pull it out to see how hard they are? Don't want to scare you ahead of time but to me it almost looks like a busted ringland, and those particles are pcs of the ringland. No particles that should be normal. They can get stuck between the piston and cyl wall and rally score up the the walls. Plus you said the other 3 pistons looks dry with no particles?
That's a good idea, I'll try to get some of the particles out.
Would a broken ringland affect compression? I did a compression test a few weeks ago and got 120psi on all cylinders with the engine cold. The other
pistons do look dry without particles.

Piston 2:

Piston 3:

Piston 4:
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kopele is offline   Reply With Quote