PCV system mods
bump for an ideal vented catch can setup on a high rpm NA motor... like mine. Want to recirculate any blow-by oil back to sump, just filter out the crap.
-vent off driver's side valve cover?
-drill out PCV?
-plumb to sump (above oil level)
-double catch can setup off both valve covers?
-plumb to intake? plumb to intake and drain to sump?
-vent off driver's side valve cover?
-drill out PCV?
-plumb to sump (above oil level)
-double catch can setup off both valve covers?
-plumb to intake? plumb to intake and drain to sump?
Last edited by kacz07; May 17, 2011 at 10:50 AM.
interested as well, but i think SG covered it earlier in this thread, a can vented to atmosphere off the drivers side valve cover with a drain back to the crankcase. or i might just check the oil and empty the can from time to time, im always messing with the car anyway
Last edited by mgrotel; May 18, 2011 at 03:35 PM.
At WOT, there is basically no vacuum in the system because the motor is not creating any vacuum. Obviously if there is no vacuum, the PCV system cant pull out vapors. Hence the statement in the FSM and every FSM about PVC systems. Your statement about the system not being able to handle the blowby is taken out of context. As no system without an active vacuum pump could do that.
YOu need a mechanical pump if you want to create vacuum at WOT. Drilling holes, adding catch cans has nothing to do with maintain a vacuum to continuously pull vapors effectively at WOT.
What crankcase pressure are you talking about with a NA car? Its always equal or less than atmosphere. So you cant create positive pressure in the crankcase without pushing air into the motor greater than 1 atmosphere. You can add catch cans, drill holes etc to catch oil vapor, but you are doing nothing to prevent that issue at WOT without a mech pump.
If you are talking about a boosted car, there are hundreds of post already about this subject, in which case you eliminate a manifold vacuum source completely and focus on reducing the crankcase pressure that can be caused by boosting.
some more reading
http://forums.nicoclub.com/positive-...d-t446254.html
YOu need a mechanical pump if you want to create vacuum at WOT. Drilling holes, adding catch cans has nothing to do with maintain a vacuum to continuously pull vapors effectively at WOT.
What crankcase pressure are you talking about with a NA car? Its always equal or less than atmosphere. So you cant create positive pressure in the crankcase without pushing air into the motor greater than 1 atmosphere. You can add catch cans, drill holes etc to catch oil vapor, but you are doing nothing to prevent that issue at WOT without a mech pump.
If you are talking about a boosted car, there are hundreds of post already about this subject, in which case you eliminate a manifold vacuum source completely and focus on reducing the crankcase pressure that can be caused by boosting.
some more reading
http://forums.nicoclub.com/positive-...d-t446254.html
I think I'm gonna do a breather filter on drivers side then a catch can with a pump to atmosphere on the pass side. I wouldn't do just a breather/catch can on both sides. With that, the system wouldn't ever pull out the gasses, they would only escape when the pressure got high. If you want a breather on both sides, I would run some sort of pump as well
I think I'm gonna do a breather filter on drivers side then a catch can with a pump to atmosphere on the pass side. I wouldn't do just a breather/catch can on both sides. With that, the system wouldn't ever pull out the gasses, they would only escape when the pressure got high. If you want a breather on both sides, I would run some sort of pump as well
good read here :
http://www.infinitiscene.com/forum/s...ad.php?t=12010
thinkin imma do option 1 with a drilled out pcv valve
http://www.infinitiscene.com/forum/s...ad.php?t=12010
thinkin imma do option 1 with a drilled out pcv valve
problem with those is what happens when, at high rpm, you dont have much vacuum to pull the blowby out? especially since at high rpm is when blowby will be the highest. and i am not sure you will see a ton of vacuum from the intake tube on the drivers side at idle, but i could be wrong there.
as i understand it, you want to keep the system flowing, so you want to have a directional flow. as i see it, the stock system flows from the drivers side to the pass side. meaning it pulls air in through the air filter, then into that vent out the intake tube, then into the drivers valvecover, then out the pass valve cover, then into the plenum area.
so, my plan as of now is to cap the intake tube hole, put a breather filter on the drivers side, then run a pump to a can and breather on the drivers side. that way even at high rpm, the system will still be pulling out gasses, when blowby is at its worst, and i will be able to cap both sides that go to the intake, keeping the pcv system completely independent of the air going into my motor
as i understand it, you want to keep the system flowing, so you want to have a directional flow. as i see it, the stock system flows from the drivers side to the pass side. meaning it pulls air in through the air filter, then into that vent out the intake tube, then into the drivers valvecover, then out the pass valve cover, then into the plenum area.
so, my plan as of now is to cap the intake tube hole, put a breather filter on the drivers side, then run a pump to a can and breather on the drivers side. that way even at high rpm, the system will still be pulling out gasses, when blowby is at its worst, and i will be able to cap both sides that go to the intake, keeping the pcv system completely independent of the air going into my motor
Last edited by mgrotel; Jun 14, 2011 at 11:04 AM.
true but i would imagine the intake air would still give "some" vacuum effect....at idle and more so at high rpm's. i like your idea, but i just dont like the idea of adding/wiring in extra stuff to put in the engine bay lol.
what is it from? i know pretty much all diesels have a vacuum pump along with some volvos, saabs, fords, etc....for mad cheap on ebay. but idk what size ports they have....
.....how do you plan on running the hoses and wiring it up?
.....how do you plan on running the hoses and wiring it up?
its a gm pump, not diesel though
to be honest, i havent thought about it too much on how to hook it up yet. prob just wire it to the ignition or something. maybe run hoses down and hid it under the car, then i can just empty the can each time i change oil. another option would be to put it in the battery compartment. lots of options
to be honest, i havent thought about it too much on how to hook it up yet. prob just wire it to the ignition or something. maybe run hoses down and hid it under the car, then i can just empty the can each time i change oil. another option would be to put it in the battery compartment. lots of options
cuz all it does is pump air, it doesnt pull a vacuum. it has 2 ports, one is the outlet (pumped air) and the other is an exhaust port. its a 3 wire setup for gm and the exhaust solenoid is only opened during certain times of operation.
i guess i dont understand why it wouldnt work cause the whole point is to get air out. but maybe thats because i really dont know the difference between the two types of pumps, idk
