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Old 04-28-2007, 09:26 PM
hotrod haven's Avatar
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valve cover breathers?

On a '74 Pont 350
Can I run a breather in both valve covers?
Theres a PCV valve in the valley pan?
Will this setup bleed off crankcase pressure correctly?
Will I have oil spurting out were I don't want it?
This car is run on the street.

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Old 04-28-2007, 10:02 PM
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The PCV in the valley pan allows the carb to create a negative pressure in the crankcase. There is no need for an extra vent in the other cover other than appearance.
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Old 04-29-2007, 04:43 PM
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Thanks But-

Looks aside the extra breather wont affect anything like excess blow-by or anything
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Old 04-29-2007, 05:26 PM
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One breather is fine, but two won't hurt anything or cause any ill affects on the engine.


Mark
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Old 04-30-2007, 12:15 AM
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cool thanks

what about dilution of the intake charge?
I don't want to dump into the exhaust either, smoke ya know.
Any other ideas?
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Old 04-30-2007, 02:22 AM
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Quote:
Originally Posted by hotrod haven
what about dilution of the intake charge?
I don't want to dump into the exhaust either, smoke ya know.
Any other ideas?

Doc here,

If that happens, the PCV valve is either wrong for the application, or defective..It's a one way valve..

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Old 04-30-2007, 08:58 AM
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I don't think you are going to improve on the factory engineer design. The scheme is to allow filtered air into one side of the motor and pulled out on the other side. The PCV is installed to only allow flow out so the air circulation is fresh in and "used" out, utilizing manifold vacuum as the "engine" to keep the pump going. If you add another breather on the same side as the PCV, then you are short changing the area that needs the positive flow because most of the air will enter the added breather.

Trees
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Old 04-30-2007, 09:58 PM
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Stiil not shure...

On my Pontiac the PCV is in the valley pan below the intake manifold so I should be good with breathers in both valve covers, Right?
Or I'll just put a fill cap in the passenger side cover hole and the breather in the driver side.
What about a catch can between the PCV and the carb, Hmmmm? Just to keep the oil mist out of my intake charge.
BTW it's cool to get feedback, so thanks to all who responded.
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