Hold On

4.7L 16V with supercharger

Question: If I am plumbing the 1/2 in. drain line from bottom of Provent200 into the rubber oil line going down front of engine to pan, DO I NEED THE DRAINBACK CHECK VALVE from Provent ??

The metal line bolted to pan does extend below the oil level in pan at least with engine off...

What do you think?

Speedtoys

If your drain to the pan will always have the bottom of it BELOW oil level. You dont need it.

If it would be for any reason above oil level, you do.

If its below oil level it wont see positive crankcase pressure preventing draining and/or blowing back up the drain.

Hold On

Thanks, That's what I was thinking. Just didn`t want any blow back up drain. I pulled tube out of pan during recent TB job and it extends approx. 2.5 in into pan.

85euro928

Were you able to source a wye for plumbing the Provent drain into the existing hose, or did you make one? I have a Provent I want to install it on my engine but have been wrestling with whether I NEED some sort of backflow valve here and what to do about the wye. The wye would be easy enough to fab up it's just a matter of finding the time. BTW, with my 3/8" pan spacer and the oil level filled to 3/8" below the fill line if I remember correctly the oil is just below the top of where that tube bolts to the top of the oil pan (if that makes sense).

Speedtoys

And the oil level moves. Plan for that, and if you need a checkvalve or not.

Cosmo Kramer

Coming from someone who has installed one on a supercharged car, the check valve is required for sure. It keeps any excess crankcase pressure from coming back up the drain tube. Provent charges an arm and a leg for it, would be great to find an alternate supplier.

Speedtoys

I just extended my drain tube to the bottom of the sump.

Imo000

Can a check valve from a GM air pump system work?

Cosmo Kramer

I believe the hose size is 1/2"

Ducman82

the GM check valve is for air, not oil. not sure the the rubber can take the oil. just add the check valve. i got the one from provent, and it worked just fine.

Imo000

Tony here uses it to vent the crankcase into his exhaust so it should be fine for oil. Worth a try it's cheap. This is the part I'm talking about: http://www.pciinc.com/index.php/gm/e.../check/valves/

Ducman82

Crank case scavenge valve. Great for vapors, not for captured liquid oil. And that valve will be ruined by oil, ask me how I know... :-) , I had that set up.

85euro928

I bought one of these off Ebay. I haven't receieved it yet but for $3 & free shipping I figured I'd take a look.

UPR 12MM Non-Return One Way 1/2 Inch Air Fuel Oil Check Valve Diesel Gas.
Low Pressure for all Fuel - PCV - Oil Separator Systems.

ptuomov

It'll see the same average pressure whether it's above or below the oil line, right? If it's below the oil line, it'll see greatly dampened pulses. That's at least my quick thinking of the physics of it.

Manufacturer's installation instructions, see page 15, consistent with the advice:
https://www.mann-hummel.com/fileadmi...nt_en_2013.pdf

Imo000

I think I've seen a metal check valve like the last picture as part of a fuel syphone kits sold at a local parts store. Came with a few feet of hose on each end. You supposed to shake it and it will.draw the fuidnfrom the tank. So check the local parts store, they might have it.