11-25-2016, 10:27 PM
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Member
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Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 2,591
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Quote:
Originally Posted by cn90
OK,
I am doing the BavarianE39's mod as we speak.
I am trying to understand why this mod works b/c:
1. I went to Autozone and got the Duralast PCV valve, I just double-checked the design:
a. Blew one way (toward I.M.), it flows.
b. Blew the other way, no flow.
Nothing special, this is the design of the PCV valve, which is basically "one-way street".
2. I also have a BMW CCV Valve lying around:
- Blocked the oil return port.
- Blew at port #2, air came out port #3.
- Blew the other way, no flow.
Don't get me wrong, I am doing the BavarianE39's mod but...
From an engineering standpoint, there is virtually no difference in the 2 designs (Mod vs Stock).
See photo below: vapor + oil is still sucked into the Intake Manifold, so why does this mod work?
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The difference between the CCV and the PCV mod as far as I can tell is that the CCV separates oil from the crankcase vapors and sends it back to the crankcase. The PCV mod sends oil to a catch can. I had my CCV replaced when it went bad and have had no issues with it since.
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