With all this talk about e-vac pumps etc...for the guys that are using e-vac systems what's your oil consumption before and after the system was installed?
I did the same and my valve cover breathers leaked oil everytime I got into the boost. I put a crank case evac pump on. It has an IN and OUT. attach the IN hose to an elbo on one valve cover and the OUT to a catch can. The other valve cover has a open breather. The pump is actived by a hob switch which comes on at 3psi and stays on until it see's less than 3psi. Its just a 12volt pump off of a chevy Malibu or Impala V6. You have to do some slight modifications to the pump. But do it right and wire it up with a relay and mine hasnt leaked a drop since! Its cheap hp and its taking stress off of the crank case!
Jason
I must be really dumb because I see no purpose for a evac pump to stop oil from getting out of the engine...so here goes...
There was oil seeping out of the driver's side breather as the stock pcv valve was sucking some oil from under the intake manifold valley area. GM should've put some kind of baffle under the intake manifold to prevent this from happening! Seeing that, I just used a push-in type breather (in which the pcv valve is mounted) on the passenger side only and connected it to the last (and larger) vacuum tube going to the vacuum block ( same place as where the stock pcv valve's hose used to be connected). I did this just prior to storing the car for the winter so I can't say how effective this will be, but I'm confident it'll be ok because if there is a little oil going into the breather, it will simply leak back inside the valve cover. I don't understand why some of you must use a vacuum pump...
Now I have a question...does someone know what kind of plug to use to cancel the hole on the intake manifold, where the pcv grommet was?
thanks
Claude :smile:
P.S: you can see the pcv valve in the breather and the hole I'd like to plug up in the "floor" of the intake manifold...
It's called an oil separator.
For example .....Lingenfelter Oil Air Vapor Separator: Lingenfelter Performance Engineering
I must be really dumb because I see no purpose for a evac pump to stop oil from getting out of the engine...so here goes...
1. Obviously there is pressure in the crank case causing oil to spew out of the engine.
2. The vacuum pump creates a vacuum and sucks the crankcase pressure (and oil) out and spits it in a "catch can".
3. The catch can has a outlet to vent all the crankcase pressure BUT what's stopping the oil from blowing out of the catch can? There's still crankcase pressure that has to go somewhere. How do you keep the oil from venting out of the catch can? Do you have a large breather hook to the outlet? If you do why don't you just hook that up the valve cover instead of trying to pull oil out of the engine with a vacuum pump????...makes no sense to me!
Now if the only purpose in having a vacuum pump hooked to the crankcase was to increase HP then I can agree to having one...BUT how much HP is that REALLY giving you???
I have got foam in my Moroso breathers that stop any oil from travelling to my pump.
Due to the foam catching the oil vapor.In my application, I have not seen a drop of oil in my catch can so I sold it.
The evac pump takes out crankcase pressure not oil out of the motor and by doing so the motor is being relieved so oil doesn't have to find the leakest link to escape when under boost.
I can say everything under the sun about it, but if your mind is already made up, its pointless.
The point I'm trying to make is an evac pump does not cure oil consumption...which is what this thread is really about.
The point I'm trying to make is an evac pump does not cure oil consumption...which is what this thread is really about. Why is it being recommended to install on a car that has engine sealing problems??? Fix the obvious probelms first instead of installing a "patch" for it.
I still stand behind my thinking that if oil is blowing out of your valve cover breathers, due to a lot of crankcase pressure, an evac system is a PATCH for the real problem....a non sealing engine....ie...rings, head gaskets, valve stem seals....etc.
Was it not about vacuum 6 wanting to remove his PCV?
Yes that is correct I’m having issues with the PCV sucking oil and at one time oil was coming out of the breathers. I’m researching alternatives for the stock PCV system. It’s obvious my engine has a seal/blow-by issue. For me as long as the engine is making HP it’s all good and until the oil consumption becomes shocking, motor is staying in.
BTW-From my understanding oil coming from the breathers was the motivation behind Champion’s breather adapter.