Quote:
Originally Posted by Halon
There's one thing I just noticed Chris that contradicts what I've heard in the past. I've always understood that you don't want to place a check valve inline between the VC and the intake pipe. Leaving that line open should better help ventilate the dirty blow-by air out, by not only allowing the old air to go out the PCV line, but by also allowing fresh air from the intake in. By putting one in line with the Intake & VC, I understand that at idle you'll create a much stronger vacuum under idling or low throttle conditions, but I don't understand the benefit of that. It wouldn't ventilate the dirty blowby air out of there as well as if you had the open line allowing in fresh air. That dirty air is bad for the oil, and you want to get that out of there as quickly as possible. If it's creating excessive vacuum at idle, enough that it's actually difficult to remove your dipstick, that seems like it may actually be bad. My CCV system is one of the little things I was going to improve upon this summer, so I actually read up a bit on this subject not too long ago. But my plan only involved using a check valve (as a back up to the PCV) between the VC and the IM. Here's a nice little MS Paint version of what I planned on doing to give a visual idea, using 2 catch cans.
Edit - picture added.
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I think I asked the same question here and thats what it also stated on the link below.
Quote:
Originally Posted by Andrew7dg
http://www.autoshop101.com/forms/h63.pdf
I am just posting this for people wondering how the PCV valve works. It provides good basic info about the system (even if it is Toyota).
After reading this something came to my attention
"A plugged crankcase breather hose may cause the engine to consume oil because of the increased level of crankcase vacuum."
It doesn't go into detail as to why but wondering if the check valve by the breather hose is really necessary?
I highly recommend the check valve (with a catch can!) by the PCV valve as the PCV valve tend to leak and cause most of the symptoms that you have listed.
Also if you haven't figured it out by the article, you still need a working PCV valve in the car (or should have one)
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One of the things that KV supposed to do is stop oil leaks
What the Krank Vent does to stop oil leaks coming from the Valve cover and other places is create a vacuum inside the oil pan and other oil areas when under regular driving conditions. remember when you are driving on the highway that the car creates vacuum. So even if you do have a leaky seal, you will be pulling air through that seal to prevent oil from leaking by.
This was my question too if it harms the car to have a vacuum inside the oil pan. Maybe not right away but overtime I wondered if this would cause a problem to the seals. Especially to an old DSM with original seals. It doesn't recommend it in the article that i posted. So I am also wondering how important is fresh air that comes into the engine through the VC is. I would think that it would dirty up the oil a little more.
So Halon I think what you have is actually the ideal situation setup to have instead of the check valve on the VC. If you have leaky seals, just fix the seals.