Wondering on a boosted application with the added back pressure if a crankcase evac kit (the kind that welds on a 45º to the collector usually) would still "scavenge" to get the pressure out of the bottom end under boost (since exhaust velocity will increase, scavenging should as well). I need to figure out what I need to do to get the pressure out of the crankcase for the new motor, and I want the most life out of it... Give me your .02.

 

I have not found a really good pump for this thats not mechanical (aka dry sump) but im intrested if anyone has feedback on pumps that can be used for this. I would like to weld a bung onto the valley cover and hook the pump up there.

 

See I had also thought of a dry sump system... what I'm referring to is are bungs that weld to the collectors, and have breathers on the motor, one with a bung that connects to the collector bungs, like the old drag cars to avoid excessive crankcase pressure at higher rpm, same thing would exist, but not sure on how it would work without the "free flowing" exhaust... Either way the exhaust velocity is rippin some ***... someone please chime in.

 

If you are running mufflers the evac with exhaust will not work. There is too much back pressure. I am looking now for a pump. Jones Racing makes one but pretty pricey. Star Machine has one that looks good. Other than that Aerospace and Moroso have them. I know Jones Racing makes one that will work on a street car.

You will need the adjustable valve to control how much vacuum.

 

Well that rules out installing that type of system (evac) on a turbocharged car. More back pressure than a muffler car by a long shot. So I need to run a line from the suction side of the turbo to the PCV system then it sounds like. BTW, where can I get a valve to control how much oil "pressure" gets to the turbo, I'm still blowing some oil into the chage pipe, even with the .050" restrictor.

 

I would think you could run a evac at the down pipe if you ran no muffler.
As far as a valve, do a search for Jones Racing, they have them and I would assume moroso would have one. I am told 11-12 is all you want to keep from having oiling problems.

 

I think I'll try that moroso evac kit (like the one on my 67 drag car) and see how it works out. Unfortunately, I have to run a line from the VC all the way to the *** end of the car where the down pipe actually is... would be much easier if the turbo were up front! I'll look into the valve and see if I can find anything that would work. Thanks for your help.

 

what about running your air pump on a hobbs switch?

 

And yet another idea... keep em coming guys... anyone solve this dilemna with something other than a freakin catch can?

 

After the mufflers should create vacuum, right?

 

I would think so... My down-pipe is only a couple feet long... Not sure if that would make any difference, doubtful. I guess I can give it a shot after I get done replacing the grenaded motor... =(

 

I know you say you don't want a can, but it's cheap and easy. http://www.spmotorsports.com/ATCmisc...ators_oil.html

 

yea there cheaper on ebay too

 

A catchcan to anything leading back to the intake as long as during boost, greater vacuum could be generated via an exhaust evac would probably work.


Arnel