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So trying to trace down a smoking issue on a fresh rebuilt longblock.
Had a full longblock rebuild on my 84mm gsr motor. Had it bored over to 84.5mm with new forged pistons ring gap set and measured via the shop
Cylinder head was fully rebuilt new LMA's new valve stem seals, guides, keepers, oem valves checked etc.
Now i'm 5,000 miles into the motor and it smokes when coming to a stop on decal. Doesn't seem to really smoke much any other time though. My catch can fills up pretty quick after a week of driving with anywhere from 5psi to 28psi depending on how i'm driving. Each round trip is maybe 30mins total of drive time so I don't put many miles on the car on the daily. When I pulled the catch can lines off the back of the block one of them had this gunk in the line. Mind you my motor oil doesn't look anything like this when I drain it nor is my dipstick milky like whatever substance appears in the catch can lines.
I have checked the turbo system and there's no oil in the exhaust nor compressor housing. Turbo has a oil restrictor via Garrett's rec and the oil drain line is properly setup to drain without issue.
I'm stumped as to what the issue is and I hope it's not the rings. I have done a compression test and the numbers came back strong but I know a compression test doesn't show everything. So I'm waiting for my leakdown tester to arrive to get a better scope of what's going on with my motor. Any help or guidance on what the issue is would be greatly appreciated. I'll also throw in a little video of driving that helps show the smoking issue.
I also want to know what that nasty looking paste/gunk is in your catch can lines. I'm guessing it's just oil mixed with gas fumes, but I don't know if it's normal for it to coagulate like that - I've never cut into lines and looked.
Leakdown test is a good idea. I don't have much to offer, but very curious as well. Hope you can figure it out, good luck.
I also want to know what that nasty looking paste/gunk is in your catch can lines. I'm guessing it's just oil mixed with gas fumes, but I don't know if it's normal for it to coagulate like that - I've never cut into lines and looked.
Leakdown test is a good idea. I don't have much to offer, but very curious as well. Hope you can figure it out, good luck.
Not sure on the ring gap I'll have to ask my builder in the morning. I hope he didn't set the gap too loose.
Yeah as for the gunk I think it's just a build up of oil/gas fumes and condensation over time. I couldn't find any of it within my oil pan or anything just built up within one of the catch can lines.
I think the gunk is acceptable - as you stated it's just oil vapors, fuel vapors, and moisture/condensation. I get that in my catch can lines too, though mine has more of a blue/green tint because I'm running VR1 oil which is blue. I usually put about 3K - 5K miles on my car each year, and I try to make it a point to pull my catch can lines and catch can for a deep clean every 3-6 months, and I get a fair amount of gunk each time. My setup is a "drain back" type...so if yours isn't, you may need to clean it more often. I do end up having to rinse the catch can filter out every 4-6 weeks. I don't get any smoke out of my car.
Deceleration creates vacuum, so I'd be thinking rings or valve stem seals. Maybe the top rings are gapped correct and doing their job, but the oil control rings have an issue?
I think the gunk is acceptable - as you stated it's just oil vapors, fuel vapors, and moisture/condensation. I get that in my catch can lines too, though mine has more of a blue/green tint because I'm running VR1 oil which is blue. I usually put about 3K - 5K miles on my car each year, and I try to make it a point to pull my catch can lines and catch can for a deep clean every 3-6 months, and I get a fair amount of gunk each time. My setup is a "drain back" type...so if yours isn't, you may need to clean it more often. I do end up having to rinse the catch can filter out every 4-6 weeks. I don't get any smoke out of my car.
Deceleration creates vacuum, so I'd be thinking rings or valve stem seals. Maybe the top rings are gapped correct and doing their job, but the oil control rings have an issue?
yeah that's the answer i'm getting from several people on the rings possibly... uggggghhhh yeah I pulled the valve stem seals out a few days ago and replaced my supertech ones with honda oem on the IN and EX side and it didn't change anything smoking related. Was really hopeful that it wasn't the bottom end.
Well after pulling my turbo kit completely off today and really taking a close look I believe my turbo is blown and might be the culprit to all this smoke. What do you guys think? It's a brand new Garrett with maybe 4,000 miles on it at best.
I think you found the problem. Looks very wet inside the turbine housing. Running a properly sized oil restrictor and have the drain tube as vertical and free flowing as possible?
I think you found the problem. Looks very wet inside the turbine housing. Running a properly sized oil restrictor and have the drain tube as vertical and free flowing as possible?
Yep the exhaust housing was very wet behind the exhaust wheel. Yeah I was running the proper oil feed line and restrictor per Garrett's recommendations. Also had the oil drain line properly setup no kinks etc.
Rebuilt Engine Smoking
