BOLO

iTrader: (40)

I don't know if this would be the right section for this, but heres the issue I'm having. I installed a Moroso vacuum pump #22640 along with a ReherMorrison inline vac regulator on my 416 LS3 build. At high rpm on the dyno, it would start spraying oil out of the Moroso catch can/filter. Vacuum hose is being pulled from mid/front area of the intake valley cover, then to the inline regulator, then to the pump, then from the pump to the catch can with filter.
I was thinking of maybe relocating the hose and pulling it from one of the valve covers instead, maybe less oil splash in there. Any suggestions is greatly appreciated, thanks.

Dimeomboost

Subscribed for info as well ill be installing a pump soon if I can afford it and would like to know the correct way to install one as well as what works best and why without starting a whole new thread

imma_stocker

iTrader: (19)

Valley cover port is the cleanest outlet, LS6 valley right with the internal baffle?

Did you dead-head the system so it only pulls blowby?


Quick fix, split the lines into the pump to spread the force. Draw from the valley cover and valve covers (inline filters or catch can... your choice) to reduce the flow from valley cover only.

slogo

Maybe you are spinning the pump too fast at high RPM.

imma_stocker

iTrader: (19)

Good point, instructions for that model say to keep it under 6k rpm. Larger pulley might be the solution?

gnx7

iTrader: (28)

I had this problem also with a GZ Motorsports pump. Measure how much it is pulling in vacuum.... then adjust it.... also make sure it has a baffle to prevent massive amounts of oil being sucked up.

BOLO

iTrader: (40)

Still sucking a lot of oil. I adjusted and set the vac regulator and its still sucking a lot of oil.
Should I relocate and pull vacuum from one of the valve covers as opposed from the valley cover? Maybe run a different oil catch can/filter? I will try to call Moroso tomorrow as well.
Any suggestions is greatly appreciated, thank you.

SoFla01SSLookinstok

Interesting about maybe spinning the pump too high.

I would try pulling off of the valve cover before changing any parts.

Nostang

iTrader: (4)

You should pull the vacuum from a valve cover and also weld a baffle on the inside of the cover to keep the oil from getting sucked in the engine. I have no issues pulling 10" vacuum on my setup with a GZ pulling from the valve cover (although I am running an LT1 but principles are the same). Way way back I ran an electric vacuum pump on an LT1 and pulled from the valley and it pulled way too much oil and less vacuum than from the cover.

speedtigger

iTrader: (16)

This is almost certainly a baffling problem.

BOLO

iTrader: (40)

I do have a baffle where it pulls vacuum. In fact its from Moroso, specifically for their vacuum pump. I should mention that its not just sucking too much oil, its actually spraying out from the top hat filter of the Moroso oil catch can. I will probably go ahead and relocate and pull from the valve cover and weld somekind of baffle as mentioned.Or I can split the line from the pump into a Y, and use two oil catch can. Any more suggestions guys? I have to addressed this issue before going to the track for testing. Dang it!

SoFla01SSLookinstok

Just for feedback. I've been pulling vacuum from the oil fill adaptor. GZ setup. Actually have been surprised at how little of oil shows up in the catch can. Hope you get it figured. Time for testing!

BOLO

iTrader: (40)

Yes I did it. I relocated the vacuum inlet hose from the valley cover to the passenger side valve cover. Drilled a new hole for the oil filler cap on the driver side valve cover. All is good so far! Now we'll see how the forecast this weekend for some testing.

MIGHTYMOUSE

iTrader: (59)

valley cover has shown to be a particularly BAD location for venting high power setups.
fills my cans faster than valve covers
stock pcv return, meh it does ok, but the above is far from that.
curious why you want a vac pump or what you are looking to gain? lots of the time the cost and complication leads to nothing useful and sometimes harm.

BOLO

iTrader: (40)

Vacuum pump was already purchased during the early part of the build. Most engine builders highly recommend running a pump for better rings seal and longevity, especially on high hp application such as this one. And yes it could be harmful to the engine if its pulling too much vacuum. So far so good.

MIGHTYMOUSE

iTrader: (59)

good luck with it, they are usually a lot of cost/complexity/upkeep for not much in return.

if you continue to have trouble with it I feel good about a single catch can system up to 1500hp and after that we can just add another.

BOLO

iTrader: (40)

If I may add, running a pump will also help prevent blowby. I recently removed the Accufab 4500 efi throttle body for some minor adjustments of the plates, and noticed the inside of the intake manifold are as clean as the day I first put the engine together, all the way down to each intake ports to cylinder head.

bigfatls6

iTrader: (34)