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Old 12-20-2010, 04:39 PM
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Crank case ventilation question?

Is there any benefit to using a breather tank such as Moroso part number 85473


as a breather tank/oil catch can? I was thinking of routing the crank case pressure from the valve covers to this item to catch any excess oil blow by that may occur. was going to run a line from each breather to this unit. I have it lying around, and notice sometimes after a pass I get some oil blown onto my valve covers from my breathers as they are now.

Yay or nay?

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Old 12-20-2010, 04:48 PM
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That is useful to catch the excess oil if you have a vacuum pump.
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Old 12-20-2010, 04:53 PM
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Quote:
Originally Posted by WDCreech
That is useful to catch the excess oil if you have a vacuum pump.
I do not have a vacuum pump. So it wont do squat?

what if I run one side from the valve cover to the can then the other side of the can to the vacuum at the base of the carb?
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Old 12-20-2010, 05:32 PM
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Street or race?? if its a street car then run a breather on one valve cover and a pcv valve on the other valve cover. That unit looks cool but as WD said......
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Old 12-20-2010, 05:34 PM
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Quote:
Originally Posted by 327NUT
Street or race?? if its a street car then run a breather on one valve cover and a pcv valve on the other valve cover. That unit looks cool but as WD said......
Street car,but I live 5 mins from Raceway park, so I have been known to rack up a few 1/4 mile passes. It seems after a pass, I find oil splatter on my valve covers from the breathers. was trying to remedy that.

So run one breather and once PCV style breather and run the hose to the base plate of the carb?
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Old 12-20-2010, 09:37 PM
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Quote:
Originally Posted by Dajerseyrat
Street car,but I live 5 mins from Raceway park, so I have been known to rack up a few 1/4 mile passes. It seems after a pass, I find oil splatter on my valve covers from the breathers. was trying to remedy that.
So run one breather and once PCV style breather and run the hose to the base plate of the carb?
What you need is a Moroso (#25900) or Summit (#120108) Crankcase Evacuation System if you are running headers.
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Old 12-20-2010, 10:01 PM
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Quote:
Originally Posted by WDCreech
What you need is a Moroso (#25900) or Summit (#120108) Crankcase Evacuation System if you are running headers.
I have heard that they only work if you have an opened exhaust. If you have mufflers I heard they dont do anything.
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Old 12-20-2010, 11:51 PM
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"I have been known to rack up a few 1/4 mile passes. It seems after a pass, I find oil splatter on my valve covers from the breathers. was trying to remedy that."

I was just trying to help that situation and I assumed that you ran open exhaust, at the track. If not, I suggest that you get a vacuum pump installed to get rid of the pressure in the crankcase!
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Old 12-21-2010, 07:09 AM
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Quote:
Originally Posted by Dajerseyrat
I have heard that they only work if you have an opened exhaust. If you have mufflers I heard they dont do anything.
They work on Bernoulli's principle which states that as the speed of a fluid over a surface increases, the pressure on the surface decreases. Whether the pan-evac works or not depends on it being properly placed in the exhaust stream and the speed of the exhaust gasses, not whether it has mufflers or not.
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Old 12-21-2010, 06:36 PM
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I run a system that uses a setup similar to the Moroso, just a different brand that is smaller. I have both of my breathers plumbed into for the exact same reason, the covers getting some oil splatter from spirited driving. Works great, keeps my valve covers clean, the catch can assembly collects the oil mist.
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