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Old 04-30-2011, 10:35 PM
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PCV Setup in Turbocharged Engine

I got advice recently in this forum about relieving crankcase pressure in my Weiand supercharged 350 engine and also to use a pcv valve from a turbocharged car like a Toyota Supra. Since then I came across a setup that uses a breather tank/catch can in the pcv setup. The setup runs a Supra pcv valve from the valve cover to a breather tank. Then a second pcv valve from the tank to the intake manifold/carb port for vacuum. Any thoughts if using this setup would relieve crankcase pressure and keep boost from entering through the valve covers? Is this a good setup for a turbocharged engine?

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Old 04-30-2011, 10:43 PM
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Seems it would work, as long as it has a vacuum source to pull and an inlet source to provide circulation/flow, you don't want to have negative pressure.
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Old 04-30-2011, 11:30 PM
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Thanks for the advise, NovaSS. I would have two breathers on the driver side valve cover. For vacuum, would the carb port provide the necessary vacuum to create a circulation system? I also have an electric vacuum pump but planning to use that to help me with brake pedal pressure.
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Old 04-30-2011, 11:45 PM
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Its fairly common for people to use emissions vacuum pumps to create airflow through the crank case.

2 breathers on one valve cover, and then on the other side you put a pvc valve that leads into a breather tank that leads into the vacuum pump which dumps into the exhaust.

as long as the pump is stronger then the exhausts back pressure, and the breather tank does a good job separating the oil mist, very little oil makes it into the exhaust system

or you can vent it to atmosphere instead of into the exhaust, but if it pukes anything its gonna be all over your engine bay and frame rails
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Old 05-01-2011, 12:01 AM
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just realized that i missed the "Weiand supercharged" part of the description.

any reason you cant do a setup just like all the carbed cars used to do? drill a hole in the bottom of your air cleaner, stick a lil foam filter inside and run a piece of hose down to your PCV valve on the valve cover

The air cleaner itself will create enough vacuum to get the job done, and if you put a catch can in line between the valve cover and air cleaner even less oil will make it through.
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Old 05-01-2011, 09:43 AM
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I think the standard pcv setup would work fine. If your vc are baffled, you really don't need a catch can. A breather on one side and the pcv on the other hooked to the carb base. Really don't think you need anything more.

When I first put my blown BBC together I didn't have a pcv. Noticed my oil got dirty real fast and that my dip stick would push out (no leaks though). Installed pcv and it fixed the problem. Runs great with a regular pcv.
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Old 05-01-2011, 10:26 PM
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Thanks everyone for taking the time to respond to my question.
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