Dry Sump Questions
Thread Starter
Staging Lane
Joined: May 2007
Posts: 83
Likes: 0
From: San Leon TX
Dry Sump Questions 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...
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...
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.
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.
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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.
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.
Last edited by 405HP_Z06; May 27, 2009 at 10:47 PM. Reason: added diagram
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Staging Lane
Joined: May 2007
Posts: 83
Likes: 0
From: San Leon TX
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
http://www.daileyengineering.com/oilpans.htm
Thanks for the diagram
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?
Thats the best setup money can buy
Ive used them since 04 with zero problems What width scavenges did you go with? 
what if... 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.
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.
Thread Starter
Staging Lane
Joined: May 2007
Posts: 83
Likes: 0
From: San Leon TX
So are you saying not even plumb valve covers to the tank?
