PCV system theory and Oil catch cans.
Jun 20, 2006, 07:42 AM
#122
Originally Posted by ovenmit331
the one by the battery (that fills up much quicker than the other) looks like it would be a huge pain to drain...
The one by the battery is still easy to drain though. All I need to do is loosen 2 bolts and take it out to drain
Jun 20, 2006, 07:56 AM
#123
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Originally Posted by evo8dad
The one by the battery is for the breather of the valve cover, which has been reported to barely collect residue/oil. The one on the firewall is for the PCV valve, which has seen a decent amount of oil collection.
The one by the battery is still easy to drain though. All I need to do is loosen 2 bolts and take it out to drain
The one by the battery is still easy to drain though. All I need to do is loosen 2 bolts and take it out to drain
Jun 20, 2006, 08:42 AM
#125
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Originally Posted by evo8dad
No problem. I highly recommend the DC-3. It is by far the best bang (if not the best cath can period) for the buck, correctly designed catch can out there.
Jun 25, 2006, 07:29 PM
#126
Well, I think the blow-by when cruising will still get thru to the intake manifold - it has to. To me, they are selling a "high performance" PCV which doesnt leak under boost and it will keep blow-by in the cylinder head at full boost etc...
Now, I would like to see if they pull vaccum like he mentions. That sounds impressive. What I don't understand is why he doesnt just replace the PCV valve with this one. Maybe, I should read it once more...
Now, I would like to see if they pull vaccum like he mentions. That sounds impressive. What I don't understand is why he doesnt just replace the PCV valve with this one. Maybe, I should read it once more...
Jun 29, 2006, 08:30 AM
#128
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I agree with the need for one catch can. However, does the PCV valve actually leak, has anyone tested the value to see how much pressure it will old. If it does start to leak, what about using two PCV valves. If the first one leaks a little bit the second one should still block the air. However, they should both open up to allow flow in the proper direction. This should eliminate the need for a second catch can.
Jun 29, 2006, 09:32 AM
#129
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A normally functioning PCV valve is supposed to allow oil vapors through to the manifold.
The catch can is meant to filter out oils and stuff which lower the octane levels,etc.
The catch can is meant to filter out oils and stuff which lower the octane levels,etc.
Jun 29, 2006, 10:23 AM
#130
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Originally Posted by Saikou_kun
A normally functioning PCV valve is supposed to allow oil vapors through to the manifold.
The catch can is meant to filter out oils and stuff which lower the octane levels,etc.
The catch can is meant to filter out oils and stuff which lower the octane levels,etc.
can
Jun 29, 2006, 12:03 PM
#131
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Originally Posted by dudical26
I understand how PCV values function. I'm not suggesting the you make the valve so that it does not allow air through. However, I am saying that the reason for having two catch cans is because under boost when the manifold has positive pressure, people claim that the PCV valve leaks and allows air to flow out of the crankcase and into the intake tract. If you were able to make it so that the PCV value did not leak, you would only need one catch
can
can
It would be great if PCV valves did not leak.
I think somebody just posted a link to one of those. They are expensive, and you still need a catch can to filter out blow-by during idles/slow rpm.
There are different ways to achieve the same thing.
I don't like to alter the original PCV system's function.
so, 2 catch cans do the job, and the PCV system stays the same.
Jun 29, 2006, 12:10 PM
#132
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If the first one was leaking...it would provide enough pressure to close the second one without being so much pressure as to make the second one leak. If the first one does not leak at all then the second one will never close, but that is fine since that purpose of the second one is to stop the leak if it was there.
Any links to this non-leaking PCV valve?
Any links to this non-leaking PCV valve?
Jun 29, 2006, 01:57 PM
#133
Originally Posted by dudical26
I understand how PCV values function. I'm not suggesting the you make the valve so that it does not allow air through. However, I am saying that the reason for having two catch cans is because under boost when the manifold has positive pressure, people claim that the PCV valve leaks and allows air to flow out of the crankcase and into the intake tract. If you were able to make it so that the PCV value did not leak, you would only need one catch
can
can
Keith
Jun 29, 2006, 03:56 PM
#134
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Originally Posted by dudical26
If the first one was leaking...it would provide enough pressure to close the second one without being so much pressure as to make the second one leak. If the first one does not leak at all then the second one will never close, but that is fine since that purpose of the second one is to stop the leak if it was there.
Any links to this non-leaking PCV valve?
Any links to this non-leaking PCV valve?
in this thread
Jun 30, 2006, 12:10 AM
#135
Originally Posted by Saikou_kun
It is post #282 in this thread
in this thread
More than half of the stuff in this thread was related to selling your cans and is now in it's own thread here:https://www.evolutionm.net/forums/sh...d.php?t=209109
Keith