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Old 09-03-2007, 08:08 AM
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oil comin out of breather filter

on my built 4.3. i have no pcv(don't ask). i have a breather filter on each valve cover. the drivers side breather is bone dry. the passenger side filter has a little bit of oil coming from it, not much, just enough to notice if looking hard.

my question. why would there be oil on 1 side, and not the other
the baffles on the inside are the same, as is everthing on the inside.



Last edited by Vortech 4.3; 09-03-2007 at 08:09 AM. Reason: spelling
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Old 09-03-2007, 09:41 AM
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Replace the filter that has oil coming out, the problem will end for a while. When accelerating the blow by becomes more due to the faster motion of the pistons as the RPM climbs, so even if you had a pcv, it would still do this because vacuum drops too low for the valve to operate and the blow by gasses have to come out somewhere and they come out the filter that has least resistance on a 2 filter system like your using. However if it were me, I would run a line from the valve cover to the air cleaner and let the incoming air pull the blow by gasses out so they could be reburned, leave a filter on the other valve cover and your set. By doing it this way, the air cleaner always has air being pulled into the carb, so it`ll act as a positive pcv system without a valve being run by a vacuum accessory. The only down fall of this system is when you remove the air cleaner lid they`ll be a mess in the air cleaner housing, so to make this less of a issue, the tube should be on the inside of the air cleaner and close to the carb or throttle body as possible, since the tube will come in under the air cleaner, make a flow director so as the gasses come out of the tube they are in the direct stream of incoming air. This system has the same advantages as a regular pcv, it keeps the oil cleaner longer and the oil will be less contaminated with fuel giving the engine and oil a longer life.
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Old 09-03-2007, 03:55 PM
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I'll take a shot in the dark. Maybe the engine rotation has something to do with it also. It seems to me that oil vapor in the crankcase would be pushed up through the oil drainback holes in the heads on the passenger side due to the movement of the rotating assembly, while the driver's side would have more of a suction effect, pulling a little fresh air into the motor. Like I said, I'm just shootin' in the dark.
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Old 09-03-2007, 06:08 PM
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I have an idea too! Install a PCV valve in one valve cover and your problems will most likely go away.

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