Thought I had a vacuum leak so i took my manifold off. These were rattling around inside??? Anybody have a clue??

 

Well I'll say you're lucky your engine didn't go kaboom.

 

Check the top end?

 

I think its the top ring. 125psi on cyl #2 and 175psi on the rest.

 

Piston ring? No way that stuff could go from inside the engine, past the intake valves, and rattle around the intake manifold. it the ring broke into pieces your piston and head would be fucked right now

 

Well theres really nothing else that looks like that that would be able to get past my intercooler.
We shall find out tomorrow. Ive been working on getting the head off.

 

Mother of god...

Maybe.... something at the exit of your intercooler or charge pipe? Like a vband piece or something?

 

I use all tbolt clamps.

Theyre curved like a ring and theyre pretty hard

 

I'm guessing parts of your intercooler. Although it could be rings if one locked your intake valve open then potentially it could eject the ring material into the IM. Grab a borescope and pull the plug on #2

Also the low compression on #2 could be due to a bent rod

 

The car runs fine and doesnt burn any oil, but if i rev it up it starts missing like crazy and running super rough, then it decides to calm down and run fine again.

 

Im thinking now that it running rough couldve been everytime it sucked a piece of metal back into the cylinder and keeping a valve stuck open. The car literally drives fine except for a slight hesitation when you take off but while cruising every ten minutes itll start missing like crazy again but if you give it like 30 seconds all the power comes back and i can keep driving

 

Big bummer dude it definately looks like a ring and only makes sense with the compression

 

I just cant wait to see what the piston and wall look like

 

 

Oh my
Sorry for your loss

 

Well that's not good at all.

 

this looks familiar!

 

top ringland is thin as hell. I believe 3mm.

This is a factory 2.2 piston vs a wiseco

 

Does anyone have a recommendation for exhaust manifold gasket? I was using the lnf on on my l61 head with lnf exhaust manifold, but it looks like it doesnt cover up these weird holes in the head.

 

I have the copper one ottp sells, but my 07 bead doesn't have the "holes" under 2 and 3 exhaust ports

 

The holes are on the sides. This is an 07 head

 

Ah, I thought you were 05-06. this is what I have:
SCE Pro Copper Exhaust Manifold Gasket

Thing seals up like crazy. I've reused it many times now and haven't had a problem yet

 

I guess ill look around but thanks for the option.

 

I think you can use a stock LSJ gasket on your head, the ports look similar. I know the LNF one doesn't seal on an LSJ head either.

That sucks about the ring, that's the first time I've seen that happen on a cobalt. VVT engine? Sometimes the internal EGR function of the cam timing causes enough vacuum to pull pieces of stuff out of the intake, seen it happen on other cars but not an ecotec yet.

 

Nope this is an l61. No vvt here. And i dont think i can use the lsj or lnf head gasket...