SF 1HOTLS1

iTrader: (24)

So I just put in a fresh rebuilt ls6 with wiseco pistons and scat rods. Put 500 miles on with non synthetic oil. Get to the dyno dunk and after a few pulls I see oil out the breather and smoke out of it also. What do you guys think.

farmington

iTrader: (14)

Always break a motor in with conventional oil. What you have isn't looking good.

G Atsma

He is; he said NON-synthetic oil. Right about the situation though....

moekluse

iTrader: (2)

Do a compression/leak down test. What did you gap your rings to?

handyandy496

iTrader: (9)

I'm a fan of conventional oil as well if its a good one. You can google up all sorts of studies done on all of them. I would be more concerned on my machining and fitment specs in respect to piston to wall and rings. I don't like going back into a new build at 500 miles but I have done it just for piece of mind.
Might be somethin as simple as that type of breather and where it is. The breathers I have seen are away from the covers on the catch can.

ddnspider

iTrader: (26)

Smoke is normal, but can you give more info of "oil out the breather"?

SF 1HOTLS1

iTrader: (24)

The oil is minimal and it is slighly getting less worse with every pull I make. The Tuner thought maybe the rings haven't seated yet. This is on a supercharged c5z. My oil pressure at idle is around 30 on a decent 80 degree day. But when oil heats up to 220 it drops to about 25psi. These pressures seem a little low. 10 30 weight.

SF 1HOTLS1

iTrader: (24)

I did a compression test before the dyno. Pistons Positions are - 3.2cc and cranking compression was 150 across the board. Did a compression test after the dyno and it was the same. But my plugs were looking black on passenger side, but clean on driver side