To delete the pcv or not delete the pcv
Joined: Jul 2013
Posts: 1,128
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Originally Posted by Apex1.0' timestamp='1438954695' post='23707182
Exactly, like I said I would try a vacuum system first. If a closed system or pump system wont work find out what will.
Let me summarize again because others may be tired of reading the back and forth between us. The OP asked about running a PCV system or eliminating it. Your response was to eliminate it, based on your real world experience of blowing out dipsticks. Your testing brought you to the conclusion that opening both ends of the system was the best way to solve your problem. Because this is what worked for you, its the ONLY way to do it, right? What I said is opening up the system would be my last resort. There are inherent benefits to running a closed PCV system, these are not debatable, these are facts. Will the closed system be functional, practical and cost effective for the OP. Only he can tell, but I would sure recommend trying that first then just jumping to your solution. Maybe the OP does not have to deal with as much blow by as you do.
But what do you care what I think? I am just a guy that asks a lot of rudimentary questions about shocks and you apparently have epic engine builds.
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Joined: Jun 2007
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I actually have tried it both ways, several different ways in fact. What I ended up with was to simply vent the front breather to atmosphere and maintain the pvc system. Ive done this config wile boosted and N/A. When I tried venting the pvc side also to atmosphere, I noticed the oil deteriorating much quicker, which was not a reassuring feeling in a street application when the oil turns black in less then 1000 miles and smells like gas fumes, when otherwise didnt. My take from this was that the pvc config benefits from extracting and burning off the unburnt fuel in the oil far outweigh not. Most of the benefits of not circulating engine oil vapor back thought the intake is being done from the front breather (which goes to atmosphere and has no other task oem other then venting) unlike the pvc side. So again in my view/experience this is the best configuration overall. I don’t have issues with excessive crank case pressure/blowing out dipsticks even when FI, nor do I have issues with smoking at the track, so I don’t run a catch can either.
Your results may differ.
Your results may differ.
Joined: Apr 2010
Posts: 570
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Delete it. My intake ports have never looked so clean since I did it. As long as you have enough venting, the pressure will find its way out. For what it's worth, my dip stick stopped popping out since deleting the pcv. Under full throttle, the pcv is closed. By removing it, you're actually allowing more crankcase pressure to be vented. I used a simple M18x1.5 to barb fitting where the stock PCV was, routed to a baffled catch can vented to atmosphere.
Last edited by imstimpy; Apr 10, 2017 at 09:16 AM.
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