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Discussion Starter #1
Read the forums til im judt plain confused anymore.. Running turbo now so my charge pipe only has one port on it. So the tube that did go from the DS valve cover to the original intake pipe is gone and a breather is on that valve cover. Now heres my issue. The PCV valve on the PS valve cover is now just open. Pretty sure thats not good. So shpuld I run a line from the PS valve cover to a catch can? Or run lines from both valve covers to a catch can? And if I go either route, does the PCV valve stay or get taken out? I know this function is important with regards to pressurizing/venting the crankcase.. What J wanna avoid is oil getting back into my intake.. Any advice?
 

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A large line (-10 or -12) from each valve cover to a vented catch can will do the job for you. With this setup, you should plug the PCV valve port in the lower intake. You don't want a PCV system when using a breather setup. Freeze plugs work well. Somebody here may be able to comment on the correct size plug to use.

I personally ran a -12AN line from each valve cover in addition to a -12AN line from a bung welded to the lower intake port into a catch can. It may be overkill, but I know it will work well.
 

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I run a PCV and i have a breather on one valve cover..i run 14 psi i dont have a problem yet?...will I ?.....
 

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Do you just have yours on the oil fill? Anyone know if the pcv should be capped running it this way?
Yes i run a breather on the oil filler tube...and i do use a pcv valve ....My TB is blocked off...i ran my supercharger this way at 10 psi no problems...if i do i will go to a catch can...
 

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Breathers everywhere, the bigger the better, you can route the covers to a breather catch can as well if thats your preference. Having too much crankcase pressure under boost slows down the gravity drain of the turbo to the oil pan, this is one of the major causes for damaging seals and smoking issues.

I run breathers on both covers and a big ass cfm oil fill breather.
 

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Discussion Starter #7
Well sounds like ill run both valve covers to a vented catch can then. But yeah, all my extra ports on my upper intake that arent being used are capped off. So the pcv valve DOES stay installed tho when rynning to a catch can??
 

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If you're running a line from the lower intake to a catch can in addition to lines from the valve covers, you don't need a PCV valve. There is no point in having one.
 

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For those who have these installed on their vehicles....can you provide some pics of your catch cans as well as info on it.....Please

thanks
 

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I done similar to raceaholic except not near as clean. I used 2 passenger valve covers and welded a -10 bung on the vent tube and put a bulkhead bung in the pcv hole and did not use a pcv valve.

Sent from my ADR6425LVW using Tapatalk 2
 

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I haven't ran my new setup yet (and won't be for a while) but here is mine in it's mock-up stages:[/IMG]

This is what I'm talking about....Great Pics

What are the part # for the items you use?

and how did you do your valve covers?



Anybody else
 

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I run a PCV and i have a breather on one valve cover..i run 14 psi i dont have a problem yet?...will I ?.....
I run the same thing now for 3 years no problems, just need to make sure you put in a PCV in good working order. PCV should be enough as long as there is no blow by on the rings.

A few of us drive around under vacuum for the most part. LOL when boosted it only for 10 sec or so.

raceoholic330's setup does look nice.
 

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heres what i do with alot of the street cars

new filter, rubber and a turbo coupe pcv valve


put some extra hose on it


plumb one of these in it

and have it drawn on from the intake stream

valve cover i plumbed on this one im still testing. but it works well.
hosed them together and ran them to a closed catch can




the hose going into the fender is plumbed into the turbo inlet side(sorry for the ####ty pic)

seems to be working rather well.
 

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All im running is a breather on the right side valve cover and have the pvc open to the atmoshpher.. I was told to run it this way i wonder if ill have problems with it??
 

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for you guys running catch cans....you need clean air coming in..where are you getting that from? is the filter on top of the catch can enuff?
 

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for you guys running catch cans....you need clean air coming in..where are you getting that from? is the filter on top of the catch can enuff?
not really if you think about it. drag racers have been putting evac systems on crank cases for years! pulling them into vacuum. cause if your boosting, making power. your going to not only be moving crank case pressure, but making it.
 

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A vacuum pump is a great thing if you can get the setup to fit and work reliability. For a race car, you're right, a vacuum pump is a must IMO. Most race engines have low tension piston ring packs, so the negative pressure in the crankcase is a must. There is typically a 30-40hp gain to be had compared to not using a vacuum pump on a racing setup. The negative pressure in the crankcase reduces piston pressure on the downward stroke allowing the engine to spin easier.

The main benefit from utilizing a pump on a street car is that it keeps the oil cleaner and reduces blow-by in addition to sealing the rings better, so a 15-20hp gain is relatively common. The issue is that most evac setups are built for racing, and reliability can become an issue. People have tried to adapt air pumps to be used as evac pumps, but the oil going through the pump seems to kill them after a couple thousand miles.

The catch can system is a push-pull system depending on whether or not the car is in boost or not. It is not the cleanest system, but it does work and has been proven to be a good solution to eliminating crankcase pressure on boosted applications. Frequent oil changes are definitely necessary. Somebody needs to create a reliable, compact, and affordable street car evac system. They will make a killing.
 
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