TTRotary

Ok as the title says, I'm utterly baffled here, and would appreciate any ideas.

My LS2 (Corvette) is eating 1 qt per 200 miles or so and I have no idea where it is going. The pan, front cover, and bell housing area are bone dry. There is no evidence of seepage around the gasket, the filter, or the drain plug. There is not a drop on the garage floor. I even ran the car in the garage for 20mn at different RPMS, thinking one of the oil cooler lines might be leaking under pressure. Nothing. Not one drop.

And the engine does not appear to be burning it. Had my wife do a couple of WOT runs and (tried) to follow. There was a bit of smoke, but it was rich gas, not oil.

So, where the hell can this be going?

For info, this is a H&C modded engine, 224/228 XER, CNC'd 243s, FAST, Kooks LTs, ported oil pump. It has a catch can installed, but seems to lose very little oil through there.

I'd appreciate any ideas.

JFM-jr

iTrader: (23)

That is ALOT of oil. Boy i'd sure think if it were going thru the cylinders at that rate you would see some evidence of oil burn. Have you pulled any of the plugs to check the threaded portion? Cant see the PCV system causing the motor to ingest quantities like that.

TTRotary

After reading the other thread, I think that will be my next step, along with seeing how much oil is in the intake. Then I guess a leakdown test is in order, though the motor consumed no oil prior to the cam.

The problem started recently and pretty suddenly.

There is also a fair bit of ticking going on, more than before I think. Wondering if I have a bad valve guide or something.

ShoddyHog

iTrader: (1)

This is the third LS2 thread I've read in the last few days with this same problem.

http://www.ls1gto.com/forums/showthread.php?p=6138642

http://www.ls1gto.com/forums/showthread.php?t=339155

Good luck!
Gerry

35th camaro

i have seen other type of vehicule burn oil and not smoke, when the cats get hot enough they completly burnt the oil with no smoke residue.

hellbents10

iTrader: (10)

I see you have ported heads, did you use sealant when installing the rocker bolts? The cats will do a good job cleaning up some of the oil smoke.

TTRotary

Thanks guys, that covers the smoke issue (I have the catted LTs). Hellbent, I'll look to see if sealant was used on the bolts that stick through. My tuner is very experienced, but one never knows what is going on in the mind of a guy burning the midnight oil to get an engine build done.

I suspect this might not be the issue, however, as the onset of oil consumption is recent and pretty sudden. I'm suspecting valve guides or rings. The bottom end of the motor is all factory and I think some 05 cars were affected by ring issues. Mine is a low miler (21K) so maybe it's rearing it's head now, who knows.

A leakdown test is definitely in order.

ViaBellator

iTrader: (2)

Yank the valley cover and see if it is sealing properly. The LS2 has the same pillars used for DOD on other models and most engine builders thread and plug the holes to prevent this type of oil comsumption issue.

Check this out....scroll down about two pages to "Building the LS2"

http://www.exoticperformanceplus.com/hotCars.php?car=66