oil being sucked threw the pcv valve on my 350 sb.. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-27-2004, 05:47 PM
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oil being sucked threw the pcv valve on my 350 sb..

Its been less then two months sence i have changed my oil in my 350 sb, my 350 has a high volume oil pump. I checked my oil and it was 2 qurats low.. the engine has less then 200 miles on it sence it has been rebuilt.. i have no oil leaks,no oil in the water,it dont smoke when it is ideling or if i give it gas..
but when i checked my pcv valve ,it has oil on the hose side and in the hose it is wet with oil.going to the carb. i have no blow by, if i take the breather out of the pasenger side valve cover and put a peice of paper over the hole with it running it tries to suck it in.
Im guessing when i get down on it,with my high volume oil pump it is putting alot of oil into the valve cover and its being sucked out by the pvc valve. am i right??? and if i turn the valve cover around will this help my problem or fix it.???? .. my valve covers has baffles in them..look under my others threads on tunnelram,or robbie on my specs on motor if you need them, or click on the link under my picture to see the valve cover.. any advice would be great.
Robbie

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Old 04-27-2004, 06:15 PM
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My guess is if the valve covers are aftermarket, the baffles don't/won't work. Hear it all the time.
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Old 04-27-2004, 06:54 PM
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If there is that much oil in the valve covers and some in the push rod valley and the filter is full, how much is left in the pan?

Troy

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Old 04-27-2004, 06:55 PM
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What I did to fix this problem was remove the valve cover and cut a slot in the upper part of the baffle, this way, the oil can`t seal around the bottom of the baffle and vacuum pull oil into the valve itself.
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Old 04-27-2004, 07:36 PM
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Quote:
Originally posted by troy-curt
If there is that much oil in the valve covers and some in the push rod valley and the filter is full, how much is left in the pan?

Troy i was just guessing

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Old 04-27-2004, 07:53 PM
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Just a suggestion,they make a baffled canister that I have used for poor baffles in the past,they are intended for non baffled covers,another slick thing is to put a hole under your plenum with a baffle canister poked in it (with a valve cover grommet) and use a threaded PVC in the plenum,then run a breather on each cover,looks tight and clean,and works good. Be sure your not pumping all your oil up top,don't want to empty that pan.
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Old 04-27-2004, 08:11 PM
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Some aftermarket valve covers use blind grommets with a slit cut into the bottom of them as a "PVC baffle". These are great for directing oil into the PCV system. These have caused more than a few engines to be condemned as "oil burners". The stock type of baffle is still among the best as long as they don't interfere with the rockers if they've been changed to full rollers.

tom
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Old 04-27-2004, 08:39 PM
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Agreed,what a joke.
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Old 04-27-2004, 09:04 PM
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I have a question on this subject. Why can't you just use a breather cap instead of a pcv? Why do you need to suck all that oil into your system?
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Old 04-27-2004, 09:13 PM
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Yes my motor is a complete roller motor,roller lifters,roller rockers
i notice also that my oil presure has droped about 5pds, it was running around 35-40 ( thats with it hot and in gear) now it drops to around 30 but it might have something to do with the oil too, i was running racing oil,20w-50w i had to add 15-40w oil about two qurats,so i know i thined it out.
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Old 04-28-2004, 01:04 AM
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Quote:
Originally posted by caminoguy55
I have a question on this subject. Why can't you just use a breather cap instead of a pcv? Why do you need to suck all that oil into your system?
For proper crank case ventilation you use a breather on one side and a pcv on the other
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Old 04-28-2004, 06:50 AM
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Or a breather on each side and a pvc in the middle,like the lifter valley. Don't want to mix you fuel with your oil,unless of course you have a 2 stroke under your hood(I assume you don't).
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Old 04-28-2004, 07:44 AM
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I just changed the oil,and put 20w 50 back in, im going to take the valve cover off to see what i can do to the baffel, or do what others have said to try.
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Old 04-28-2004, 01:37 PM
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Or a breather on each side and a pvc in the middle,like the lifter valley. Don't want to mix you fuel with your oil,unless of course you have a 2 stroke under your hood(I assume you don't).
What about a breather on one side and the pcv in the middle with nothing on the other side?
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Old 04-28-2004, 07:33 PM
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Yes,it would work,but your leaving an area of vapor not circulating and if I could avoid that I would. The other reason I suggested twin breathers is if the dual quad is being run at the range it likes,you create more blowby,possibly more than one breather can handle,there is no harm in having too much ventilation,but plenty without.
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