My buddy has a GZ Motorsports vacuum on a C6 Z06 dry sump car. No matter what setting he puts on the vacuum pump, it is always sucking out tons of oil and spraying it out through the air filter.

No apparent leaks. Any ideas what could be causing this? GZ Motorsports thinks the motor has a vacuum leak. It doesn't. Idles perfect. Puts down 630+ RWHP.

 

Where is the pump drawing from? Obviously an oil rich source....

 

Passenger side valve cover at the front.

 

Does it have a baffle in the valve cover?

 

Pump drive ratio correct?

 

I had same issue. 427 swap in my 4th gen camaro with a wet sump steel pan. Gz pump as well. My tuner added an oil return to pan line from the bottom of the can to the pan. He also pulls from both covers now and Ts it into 1. I went from spraying all over the place to a light film only around the vent on the can. Improved racing makes a kit but can be done with stuff laying around.

 

We welded in a baffle yes.

 

I just have a bolt on ls1 but haven’t had any issues with the GZ kit. Picked up power and have no oil issues

 

I'm running the same pump on my 427 and I have no issues. But on this dry sump LS7 it sprays oil everywhere.

 

What's the plumbing layout?

 

Disconnected and plugged every line to the intake from the valve covers or reservoir tank. Left the line from the air intake to the reservoir tank connected as per instructions from GZ Motorsports,

Aftermarket valve covers with fitting on passenger front valve cover feeding vacuum pump. Vacuum pump to catch can.

 

"Vacuum pump to catch can".
The vac pump obviously pulls a vac signal on the engine and then the pump creates pressure on the outlet side that blows into the catch can.
Pressurizing the catch can blows the oil mist out of its' breather.
If you look at a catch can such as a Mighty Mouse, in a forced induction app, there's a check valve to close the breather under boost.
Unfortunately, the vac pump couldn't work with that check valve.
Bottom line: The oil being blown around is not due to the valve cover inlet to the pump. It's the catch can oil.
A properly designed and installed dry sump system shouldn't need a vac system.

 

Does it happen during normal street driving, or only in track conditions? The valve covers can completely fill up with oil under heavy cornering, so if you're only pulling from one valve cover, it will suck oil under lateral G's in that direction. Pulling from both valve covers would help mitigate that because one valve cover will always be uncovered while cornering. You could tee both valve covers together and then run them to the pump. If that's not what's happening, then the valve cover baffling may just not be working. Can you pull from the valley cover instead? That would be a much better location.

 

Happens all the time in every condition. GZ told us to pull from the valve cover.