Blown Rings?
Thread Starter
Teching In
Joined: Oct 2014
Posts: 37
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Blown Rings? I'm pretty sure I know the answer to this, but figured it would not hurt to ask.
2000 Ls1, stock bottom end, A&A Vortech super charger, 10 lbs of boost, 68k miles, 0w 40 Mobile 1.
This instantly happened, it did not gradually get worse.
Car has been sitting most of the winter. Sees very little street time.
I was showing of for a few friends and checking it out before a race this weekend.
Ran it up to 6000 rpms a few times.
I hit 152 mph in 5th rpms were not very high on that run.
I turn around to go back to town and car is engulfed in blue smoke.
No, it was not white, its oil. It looks like oil, it smells like oil and the back of the car is black.
I can drive around gently and I really don't see any smoke.
Under acceleration there is no smoke.
No smoke at start up, well there wasn't last time I started it.
If I run the rmps up, press the clutch and roll to a stop the car seems on fire.
This really isn't a little smoke. I am sure people will call the fire department if
they see it smoking this bad.
I ordered a PCV valve and ticker oil. They will be here in the morning.
There was oil in the intake. I also ordered a catch can it will be here later this week.
I doubt it's the PVC valve but... maybe I get really lucky.
I'm pretty sure the rings are trashed.
Do they typically just go... I thought they wore out.
What do you guys think?
2000 Ls1, stock bottom end, A&A Vortech super charger, 10 lbs of boost, 68k miles, 0w 40 Mobile 1.
This instantly happened, it did not gradually get worse.
Car has been sitting most of the winter. Sees very little street time.
I was showing of for a few friends and checking it out before a race this weekend.
Ran it up to 6000 rpms a few times.
I hit 152 mph in 5th rpms were not very high on that run.
I turn around to go back to town and car is engulfed in blue smoke.
No, it was not white, its oil. It looks like oil, it smells like oil and the back of the car is black.
I can drive around gently and I really don't see any smoke.
Under acceleration there is no smoke.
No smoke at start up, well there wasn't last time I started it.
If I run the rmps up, press the clutch and roll to a stop the car seems on fire.
This really isn't a little smoke. I am sure people will call the fire department if
they see it smoking this bad.
I ordered a PCV valve and ticker oil. They will be here in the morning.
There was oil in the intake. I also ordered a catch can it will be here later this week.
I doubt it's the PVC valve but... maybe I get really lucky.
I'm pretty sure the rings are trashed.
Do they typically just go... I thought they wore out.
What do you guys think?
Pull plugs and check them. If you had oil in the intake then all the plugs are probably going to show oil. But since it was in your intake I would suspect the pcv sucked a large amount of oil for some reason. You cant get oil in the intake from a piston issue. Unless it blows up and gets into it. Which yours didn't. You might want to pull the valve cover to see if you have a blockage in the head that's not allowing the oil to drain fast enough. I am going to bet your head is filling with oil. When you accelerate the oil is going to the back of the head, right where the PCV is located. When you coast or let off, the oil moves away from it.
Thread Starter
Teching In
Joined: Oct 2014
Posts: 37
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#3 Cylinder plug is covered in oil.
Friend borrowed my compression tester. I am trying to get it back today.
Can not find anyone with a leak down tester. Will have to get one tomorrow in town.
I live in the middle of no where.
I'm sure the rings on #3 are gone.
Time for Kyle to build me a 383. Will be calling him in an hour or so.
Friend borrowed my compression tester. I am trying to get it back today.
Can not find anyone with a leak down tester. Will have to get one tomorrow in town.
I live in the middle of no where.
I'm sure the rings on #3 are gone.
Time for Kyle to build me a 383. Will be calling him in an hour or so.
TECH Addict
Joined: Mar 2013
Posts: 2,628
Likes: 30
#3 Cylinder plug is covered in oil.
Friend borrowed my compression tester. I am trying to get it back today.
Can not find anyone with a leak down tester. Will have to get one tomorrow in town.
I live in the middle of no where.
I'm sure the rings on #3 are gone.
Time for Kyle to build me a 383. Will be calling him in an hour or so.
Friend borrowed my compression tester. I am trying to get it back today.
Can not find anyone with a leak down tester. Will have to get one tomorrow in town.
I live in the middle of no where.
I'm sure the rings on #3 are gone.
Time for Kyle to build me a 383. Will be calling him in an hour or so.
I lost number 7 cylinder compression was still 160 psi was oiling down the plug badly, parts of the piston were in the exhaust.
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Thread Starter
Teching In
Joined: Oct 2014
Posts: 37
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I have only done two cylinders at this point, just for a base line.
Engine is cold.
Compression Test:
#2 = 120
#3 = 60
#5 = 120
#6 = 110
#7 = 120
That tells me something is wrong.
Still don't know if it is a valve or piston.
Since air blows out the oil cap. The piston is gone.
If it were a valve it would suck in on he exhaust.
I think.
Engine is cold.
Compression Test:
#2 = 120
#3 = 60
#5 = 120
#6 = 110
#7 = 120
That tells me something is wrong.
Still don't know if it is a valve or piston.
Since air blows out the oil cap. The piston is gone.
If it were a valve it would suck in on he exhaust.
I think.
Last edited by frenchsquared; Apr 8, 2015 at 02:59 PM.
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Brett Foote Yea, if you have air coming out of the oil fill cap, its a piston or rings. Most likely a broke piston. Your getting air into the crankcase. Bent valve wont let air into the block. A bent valve will let air into the intake or exhaust depending on which one bent. Time to pull an engine.
Since your supercharger has basically doubled your horsepower per cube; there is a **** ton more upper combustion temperature for the pistons to deal with. GM ring gaps are pretty tight to seal the compression, minimize emissions, and last for 250K. So now the leanest/hottest cylinder butts the primary ring gap together which breaks a small piece of the strong but brittle hypereutectic piston. If this happens at a high rpm, the small piece gets crushed between the flat piston and the quench part of the combustion chamber which can cause the rod and piston to part ways...seldom leaving anything left but future beer cans.