Well I finally got my car together and tuned and it runs great. It has about 300 miles on the new motor and tranny.

This is what I have:
1998 Camaro SS
Forged 6 liter
Stock crank
Eagle rods
Diamond forged pistons
Comp cams turbo cam
LS6 intake
65lbs injectors
GT70 STS Turbo
There's more but you get the idea.

I've been driving it pretty easy and haven't been beating on it.

The other day I drove the car 120 miles to see some family and took my brother in-law for a ride. I got on it pretty hard through 1st and 2nd gear.
I left it in drive and let the computer shift it. Just your normal 0 to 80 or so run.

My brother in law looked behind us after the run and said there was allot of smoke I didn't think anything of it because the tires were spinning all the way to 80mph and thought it was tire smoke.

On the way home later that day I merged into traffic on the highway and stepped on it a little to get up to speed. I looked behind me and there was a cloud of blue (oil) smoke. I pulled over and popped the hood. Oil was all over the right side header from the pcv valve. I checked the oil level and it was still full. The car was still running perfect, no noise, no loss in power and it was running cool. I drove the car home 120 miles without any problems. I babied it and stayed out of the boost. It ran cool and didn't blow any more oil out.

The tune on the car is very conservative and has almost no knock. It has forged pistons and I'm only running 10lbs of boost. I haven’t done a leak down test yet but plan on it next week some time to see if a piston broke.

Anybody have any ideas? I can't believe I broke a piston considering their forged and the tune is right on. With only 10 lbs of boost the head gaskets should be ok.


I've heard crank case pressure is a problem with the LS1 and forced induction so I hope it's just the pcv system. I just don't understand how its been running so well and until now hasn't blown any oil out. Could the pcv valve be plugged or something? I looked at it and there is oil all over it.


Any ideas as to what could cause this??

Thanks guys

Jon

 

how is your crank case vented? you usualy need to modify the pcv set up somehow to let the presure out. either just a valve cover filter vent or like i have a hose going from a valve cover to in front of a turbo but that lets some oil back into the turbo/intake.

 

STS has a thing that blocks off the pcv during boost, other than that it is a stock pcv system. Whats wierd is it didn't leak any oil or have any issues for the first month of driving after the turbo was installed and than out of nowhere it started blowing oil out of the pcv.

I was told if I vent the valve cover with a breather cap it will not allow the pcv to work properly. Is that a smart way to do this?

Thanks for you help,
Jon

 

I run a check-valve on the PCV line.

 

i guess i really dont know that much about this. the check valve will keep boost out of the crank case but how do you relieve the presure that builds up from blow by?

if your problem just came up really fast then you may have hurt something.

 

run your pcv to a vent and plug the manifold where it was hooked up, sure you get vaccume under cruiseing but where you need the venting is under wot, thats when your crank case gets pressure, and when the check valve closes then you have no vent.....

 

Not to steal the thread but I had oil misting out of my pass. valve cover breather under boost on the dyno. My set-up is: removed all lines running to and from the valve covers/intake/throttle body, plugged them, and put valve cover breathers on the driver and passenger valve covers. The engine blew up about five pulls later. Was the engine already damaged or is my breather system wrong? I am having this guys exact same engine put in my car in about a week so I want to make sure it will be ok.
I plan on hooking up the kit and tuning it for street driving without getting into any boost for the first 500 miles. Then I will tune it for WOT and see what happens.

 

what afr were you running on the pulls?

 

11.0-11.6