rockoosi1

iTrader: (1)

Well, I believe I hurt my engine (6.0L / MP T-76) the other day. I was trying to dial in my tune @ about 12 psi on the street but couldn't get my AFRs correct. When I got back to my house I notice that I have lots of smoke coming out of the valve covers and dipstick tube. The engine seems to be running ok other than a slight miss.

I searched for PCV valves on these engines and as far as I can tell the engine just vents through valve covers correct? My guess is I have hurt a piston or at least the rings. Since it may already be toast but seems to running okay should I keep going or tear it down? I think I know the answer but figured I would post to see if anybody else has run into this problem. Thanks!

lifeisgood

iTrader: (4)

alot of people use a catch can when uping the boost on ls engines. im not very experience with that subject as far as how everything is ran, but i know its a problem.
dont be so quick to assume your engine is toast though

98Camarod

iTrader: (43)

I had the same issue with blow by. I capped everything off and ran a line from each valve cover to a vented catch can. I haven't had any problems since then.

BadgeZ28

iTrader: (28)

I need to remind myself in these situations to KISS. If you have run the car on boost for some time without this problem then I would guess the increased boost is pulling more oil into the motor and a catch can setup is a good move. I have heard guys who have taken out pistons will have the dip stick blow out part way. If it doesn't clear up, do a leak down test. Do you have the vent hose to the side of the throttle body blocked off?

black98ws6ta

iTrader: (77)

If it didnt have much at all before and now it has alot, you probably hurt the motor. Pull the plugs, and do a compression/leakdown test.

IMPATIENT 1

x2, sounds like #7 lost a ringland

CarsandWomen

iTrader: (19)

I third the motion of a compression/leakdown test, this will tell you if the motor is ok. If its good, there is a sponsor on here, Lashway Motorsports, that make a catch can built for boost with built in check valves. setup properly, it will pull vaccum on the crankcase all the way through the rpm range, regardless of what the induction side is doing. good insurance

AZZKIKR

iTrader: (2)

Mine was starting to do the same thing, installed the catch can and check valve.. Eventually lost ringland on #2 a few hundred miles later.

98Z28CobraKiller

iTrader: (17)

+1.....

rockoosi1

iTrader: (1)

So I plan on doing a compression test to confirm my suspicions. Do y'all think if all I did was damage the ring land I will be able to get by with a cylinder hone? I don't want go through getting the entire block machined and all that comes with that. If I can get by with a fresh set of forged pistons and rods that should be plenty for my goals. I'm just trying to build something that will hold about 15-18 psi of boost and still be fun to drive.

Gonoma

iTrader: (15)

that will all come down to finding out how bad the walls are IF you have to tear it down. Nobody can answer that without seeing if it is damaged

BadgeZ28

iTrader: (28)

Cheap and dirty rebuilds and 15 pounds of boost are not a good combination.

IMPATIENT 1

if the cylinders arent hurt, either back off the boost and replace the piston/rod combo in that cylinder only with a pull out piston/rod offa ebay or you can drop a grand on some hbeams and diamond pistons, beat on it like it owes ya money 625.00 for forged ls1 pistons(overbore'n to 125 over) and set of decent hbeams in the 375.00 range are pretty easy to find.