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06-14-2019, 07:08 PM | #1 |
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Help with possible piston problem
Hi all,
I did a used oil analysis and it came back with excessive aluminum, iron, and lead content. I stuck a borescope camera in the cylinders and cylinder 1 appears to have oil and tiny pieces of something in it. Any idea what that could be? The other 3 cylinders looked dry. Thanks for the help!
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06-14-2019, 07:21 PM | #2 |
Scooby Specialist
Member#: 395275
Join Date: Jul 2014
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RMIC
Location: Fort Lupton, CO
Vehicle:2012 STi SWP |
From the pictures, it looks like you just have some blowby. Or are you talking about the particles near the cylinder walls?
What was "excessive" in the UOA? |
06-14-2019, 07:30 PM | #3 |
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06-14-2019, 08:26 PM | #4 | |
Scooby Newbie
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Quote:
Thanks for the help! |
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06-16-2019, 10:57 AM | #5 |
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Anyone know if the particles in the pictures are normal?
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06-17-2019, 10:01 AM | #6 |
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Location: Philly
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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?
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06-17-2019, 11:12 AM | #7 | |
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Quote:
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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06-17-2019, 12:12 PM | #8 |
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to be honest, it looks fine to me.
When I cracked a ringland, compression test showed 60 psi cold on cylinder 4. 125 on all others. there MIGHT be some scoring on the 2nd cylinder wall from the picture, but without tearing it down I wouldn't worry about it. I assume you went with blackstone? While your wear metals seem high, you cant use an UOA to identify a failure. Some people have perfect UOAs and they spin a bearing, and some people have high wear metals for years with 0 issues. My wifes brand new 2014 WRX was showing 5 ppm silver content at 10k miles. People were telling me "its gonna blow up soon" so i traded it in. Talked to the new owners not to long ago and its got 95k miles and the SB has never been replaced. They've only had to do basic repairs on it. I had a UOA done in June 2018 and it showed excessive wear. I changed oils to a "thicker more robust" 5w-40 and did another UOA December. I had 40 silver content, 110+ copper, 11 lead etc etc. blackstone flagged my copper but the oil I was using uses copper as an anti-wear additive. So I stopped doing them, because honestly I'm not going to replace an engine that is running perfectly fine now in the chance it may blow up tomorrow because a UOA said I had high wear metals. UOA are really a tool for checking how well your oil is doing, if its shearing down, if its not holding up(which is what I experienced with motul 5w-40) |
06-17-2019, 02:02 PM | #9 | |
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This new sound and the UOA have me worried. The engine seems to run well otherwise and hasn't lost any power. I have sent all this to my engine builder as well, so far the only thing he said is that cylinder 1 may have suffered detonation. |
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06-17-2019, 02:42 PM | #10 |
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How did the spark plug in Cylinder 1 look?
I would not be surprised if the noise you mention was always there but the UOA has made you more sensitive to noises since the report stated that you may have a problem. If the motor is running and compression is good then I wouldn't worry to much. |
06-17-2019, 05:42 PM | #11 |
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Yes, you have to be careful using UOA to identify a failure. Unless you tested your oil before and after it is hard to tell where the metal is coming from, and like Waddlz said, different oils can give you different UOA results.
120 psi in all 4 cyl is good news. Do a leak down test just to be sure. |
06-17-2019, 06:55 PM | #12 | |
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06-17-2019, 08:18 PM | #13 | |
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06-20-2019, 02:39 PM | #14 |
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Hard to tell but the first pictures looked like detonation marks to me. If they don't wipe off that's what I would unfortunately lean towards
Is this a stock engine or rebuild? Mileage? Mods, tuner, fuel used? |
06-21-2019, 04:01 PM | #15 |
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Check that plug very closely. If those are tiny specs of aluminium fused to that porcelain you have a detonation issue.
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06-25-2019, 10:21 AM | #16 |
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any luck getting those particles out and inspecting them?
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06-26-2019, 08:27 PM | #17 | |
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Quote:
Mods: Turbo back exhaust, equal length headers, external waste gate, AEM intake, 1050x injectors, AEM 340lph pump, Radium FPR, TGV deletes, 3 port EBCS, dual catch cans. Tuner: My dumbass with open source. Fuel: 93 What do detonation marks look like normally? Last edited by kopele; 06-26-2019 at 08:34 PM. |
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06-26-2019, 08:30 PM | #18 |
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06-26-2019, 08:33 PM | #19 |
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06-29-2019, 09:59 AM | #20 |
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Help with possible piston problem
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07-03-2019, 11:53 AM | #21 |
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01-22-2020, 11:06 AM | #22 |
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That was indeed pitting from detonation on piston 1. All pistons have the compression ring side clearance way out of spec. Does anybody know what causes that? I can't find any information about the cause online. Engine has about 15K miles on it. Thanks!
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