JVetthead

I have built an LS7 with a wet sump setup for my road race car and have been having the usual low oil preasure problems.
I am now switching to a dry sump setup with a cnc Dailey pan and pump.
My question is what to do with the PCV setup? I know it will not be set up like it was. And if I just plumb it to the tank will I still get the advantige of vacuum in the crankcase?
Is there a way to help keep oil out of the valve covers?
Thanks...

405HP_Z06

iTrader: (11)

https://ls1tech.com/forums/generatio...cv-system.html

JVetthead

I have seen that.. I want to avoid plumbing anything to the intake if possible..

405HP_Z06

iTrader: (11)

I understand, but without a vacuum pump the only way to pull any vacuum on the crankcase is through the intake.

JVetthead

This setup has external scavenge/pressure pump. From what I understand the scavenge pump pulls vacuum from the crankcase..

405HP_Z06

iTrader: (11)

If your using a 4 stage dry sump pump than you should block all factory PCV ports except the oil tank. The engine must be sealed to benefit from the vacuum provided by the scavange stages.

Run the lines on the oil tank to a catch can with breather. A good 4 stage dry sump pump will provide the needed 8-10 inches of crankcase vacuum.

Concerning oil in the valve covers, the only way to reduce that is to use restricted pushrods.

JVetthead

Iwas thinking maybe a restricted amount of air in through the valve covers to help pull excess top end oil on down..?

405HP_Z06

iTrader: (11)

Typically, the vacuum relief valve would be installed on a valve cover to ensure crankcase vacuum doesn't exceed preset levels. Adding a controlled vacuum leak at the valve cover opposes what your trying to achieve with the additional scavenge stages in dry sump pump. I don't know absolutely without modeling it, but I don't think this would function as you expect.

To speed oil drain back, there are other methods to help achieve this. If the scavenge stages of the dry sump pump help this, great; however, I wouldn't look to use this as the primary method to expedite oil drain back from the top end of the engine. JMHO. I don't know about the Dailey dry sump components, but you could run one of scavenge stages to the valve covers.

Here's a diagram of this configuration. I don't have any of the dry sump lines in this diagram.

JVetthead

With the Dailey there is no external plumbing from the pan to the pump, It is integrated inthe pan..

http://www.daileyengineering.com/oilpans.htm

Thanks for the diagram

405HP_Z06

iTrader: (11)

Keep us updated on your progress, the Dailey systems look very nice.

405HP_Z06

iTrader: (11)

Post some pics of this installed. I would like to see how it fits in the C5 engine bay. Are you running all accessories?

JVetthead

well here is the reason for the dry sump....

Louis

iTrader: (7)

The engine needs to be 100000% SEALED. NOTHING to atmosphere.... There needs to be a tank vent, and that is it, as mentioned!

Thats the best setup money can buy Ive used them since 04 with zero problems What width scavenges did you go with?

serpentnoir

iTrader: (2)

What if you vented the oil tank back to the intake manifold through a PCV valve? That would be the only venting in the system.

I guess that was the original question at the top and it seems to make sense.

Upon second thought, that would create a vacuum in the tank. May be an issue for oil feed to the pump.

Louis

iTrader: (7)

You have to ask yourself why? Are we worried about smell with a racecar? Just run a breather off the tank and be done with it

405HP_Z06

iTrader: (11)

JVetthead

The pan is definitely art work!
So are you saying not even plumb valve covers to the tank?

405HP_Z06

iTrader: (11)

Nope.

Louis

iTrader: (7)

x2, nope.... completely sealed

Beaflag VonRathburg

iTrader: (176)

That oil pump is quite impressive. How did that happen?