oil problem
- Thread starter sweet tooth
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the98stang
Active Member
rings are probably worn, and the nitrous won't help. do a compression test and make sure everything is OK. You could use a thicker oil such as 10w-30 to prevent ring blow-by.
Huh? He is getting oil through his PVC line into the intake/plenum. How is that related to the rings?
The reason you are still getting oil in your intake is because the oil separator mod is worthless. If you really want to fix the problem get a catch can.
If you want to go the low cost route restore the hacked up PCV system to stock and always make sure you have a good working PVC valve.
Oil "separators" FTMFL! Quit modifying/rigging the PVC system people damn...
The reason you are still getting oil in your intake is because the oil separator mod is worthless. If you really want to fix the problem get a catch can.
If you want to go the low cost route restore the hacked up PCV system to stock and always make sure you have a good working PVC valve.
Oil "separators" FTMFL! Quit modifying/rigging the PVC system people damn...
trombonedemon
Well-Known Member
Hey, what Kilgore trout said, plus, when I put my catch can in the vacum was to high, and it started to suck fresh oil off of the bearings w/ a loud squeal, so I capped off the the upper plenum w/plastic hose and a metal stopper that was provided to me. But, I was still getting blow-by in my upper intake, so I got a second pvc stuck in a larger rubber hose, much like the one the IAC is connected to, and a metal ring to slow down the vacum suction, now if your car runs rich often then you are going to get a light brown sludge blow-by but the second Pvc should take car of that, "walla" only the gas fumes get by. It takes some custom work to get the vacum just right, whats provided w/most catch cans is not enough. It works fine. Or you can just put back your oem pvc system, but its not as affective as the catch can, plus your emmissions are going to higher!
wmburns
SN Certified Technician
Likely we are talking about different levels of good enough.
If you want to remove ALL oil from the PCV system, the oil catcher/separator has to have several properties.
1 It must flow enough volume to handle all of the gases coming from the motor.
2 It has to provide a way for the combustion vapors to “condense” from gas into a liquid.
3 It has to hold the liquid condensed.
4 It has to have a way to empty/dispose of the condensed liquids.
5 It has to be vacuum/pressure tight
IMO, the most difficult thing to accomplish is #2. The easy way to do it is to provide an expansion chamber for the gases to condense within. However, if the volume of the chamber is low, there will not be enough time for the oil to condense. The problem gets worse as the flow increases.
An improved design incorporates heat exchange into the design. This cools the gases promoting more oil to condense. This is why a catch can designed for racing is physically SOOOO much larger. This also why there are screens and baffles designed to modify the flow to promote condensation.
IMO, it is unrealistic to expect a small volume compressed air filter to remove all oil from the PCV system ALL of the time.
If you want to remove ALL oil from the PCV system, the oil catcher/separator has to have several properties.
1 It must flow enough volume to handle all of the gases coming from the motor.
2 It has to provide a way for the combustion vapors to “condense” from gas into a liquid.
3 It has to hold the liquid condensed.
4 It has to have a way to empty/dispose of the condensed liquids.
5 It has to be vacuum/pressure tight
IMO, the most difficult thing to accomplish is #2. The easy way to do it is to provide an expansion chamber for the gases to condense within. However, if the volume of the chamber is low, there will not be enough time for the oil to condense. The problem gets worse as the flow increases.
An improved design incorporates heat exchange into the design. This cools the gases promoting more oil to condense. This is why a catch can designed for racing is physically SOOOO much larger. This also why there are screens and baffles designed to modify the flow to promote condensation.
IMO, it is unrealistic to expect a small volume compressed air filter to remove all oil from the PCV system ALL of the time.
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