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Thread: Crank Case Ventilation fully explained. (Turbocharged edition.)

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Posts: 131-140 of 201
2013-06-04 15:51:44
#131
Originally Posted by Vadim
you don't think it will help evacuate the crancase pressure under load?
Why would it? You're already drawing from the valve cover under load. You want to draw from it some more? You can't. You're using the same size hose at the end of the day to draw things through to the intake.
2013-06-04 15:53:00
#132
Originally Posted by wnwright

Let me know when you see ~20 in/hg at idle from intake tube.


Some mad turbo suction power, or a very small intake pipe :-P

Originally Posted by BenFenner
Originally Posted by Vadim
you don't think it will help evacuate the crancase pressure under load?
Why would it? You're already drawing from the valve cover under load. You want to draw from it some more? You can't. You're using the same size hose at the end of the day to draw things through to the intake.


I kind of wonder why they bothered with PCV system then if valve cover breather pretty much eliminates the need for it. Granted valve cover breather wont be as good at idle, but still.
2013-06-04 16:02:40
#133
A valve cover breather does not eliminate the need for the PCV system. Not even close.
2013-06-04 16:23:10
#134
electric vacuum pump?
2013-06-04 16:45:40
#135
You offering?
2013-06-04 18:15:14
#136
Ive thought about it.
2013-06-04 19:04:36
#137
From the N/A thread. Same principles apply to boosted setups.

Originally Posted by BenFenner
Using an air pump (electric or mechanical) to ventilate the crank case on 1991-1999 engines:


Effect on the following characteristics:
  • De-clutters the engine bay - No
  • Simplifies crank case ventilation system - No
  • Helps remove more oil from the air - Yes
  • Help evacuate the crank case - Yes
  • Maintains or improves the stock flow capacity - Yes
  • Helps promote ring seal and prevent blow-by - Yes
  • Helps prevent oil smoke in exhaust - Yes
  • Helps prevent dip stick from popping out - Yes
  • Helps prevent oil leaks due to pressure - Yes
  • Helps keep intake track clean including throttle body - Yes
  • Helps keep intake manifold/plenum clean - Yes
  • Maintains or reduces amount of pollutants - Yes
  • Maintains prevention of un-metered air from entering the intake - Yes
Consensus: GREAT IDEA!
2013-06-04 19:34:25
#138
Have you found any good electric kits?
2013-06-04 19:43:04
#139
No, I have not. Any I've seen are too loud for continuous use. I haven't been looking hard though.

The BMW S52 engine (and I'm sure others) comes with an air pump that might work well and be quite, I've not researched it enough though.
2013-06-05 04:52:16
#140
Tried it out today, the amount of vacuum coming from the turbo is definitely sadly low, probably 3inHg or so. One thing I realized, while at WOT driving this setup might be fine, but while cruising there would be extra blow-by causing drag. This is not possible to put into power numbers, but would probably be seen by slight loss of MPG.

One main thing that I do like about routing PCV to breather, is reduced amount of oil/oil vapors in the intake manifold. Granted without a catch can this oil will just build up in the intercooler, but with a catch can it reduces the need for having two separate catch cans.
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