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Old 07-01-2010, 08:12 PM   #1
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Default PCV system.

What should I do about it? I'm newly boosted, and I just blew my first rear main seal (yay!) which leads me to believe my crank case is being pressurized excessively.

I searched but can't really find any definitive thing that people are doing to solve this issue. I know some people are running a 323 valve, but that's all I can find on the subject.

Thoughts?
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Old 07-01-2010, 08:35 PM   #2
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Run both vents off the valve cover into a vented catch can and cap the intake manifold port.
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Old 07-01-2010, 08:41 PM   #3
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Read the post above and be a man for the first time in your pathetic life.
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Old 07-01-2010, 09:08 PM   #4
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https://www.miataturbo.net/showthrea...ighlight=catch

read and be happy. I did an ebay catch w/vent, took my pcv apart (pulled out all the guts) and attached both ports on the head to it. You can see I still ooze oil out of the filler though.

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Old 07-08-2010, 02:17 PM   #5
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It's ugly but functional. PCV valve is hollowed out (no check valve). Catch can has a vent hole (not shown) in case of excess pressure from the 2 hoses coming off the valve cover. The intake manifold where the stock PCV used to be is plugged.

I've been running like this for a couple years with no issues.

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Old 07-08-2010, 02:23 PM   #6
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search "catch can"
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Old 07-08-2010, 03:06 PM   #7
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Hell all I have done special to my pcv system is add a check valve in front of the pcv valve...that's it. I have zero blow-by.
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Old 07-08-2010, 03:25 PM   #8
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You ^^ don't count
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Old 07-08-2010, 04:37 PM   #9
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why not?
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Old 07-08-2010, 04:55 PM   #10
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Old 07-08-2010, 04:55 PM   #11
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okay then.
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Old 07-08-2010, 04:57 PM   #12
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Still don't count
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Old 07-08-2010, 05:24 PM   #13
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Quote:
Originally Posted by tilt View Post
looks like roadkill entrails. but if it works........
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Old 07-08-2010, 08:29 PM   #14
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Just because you don't see it, doesn't mean there's no blow-by. I had no issues at 9 psi with the stock system, but when boost was at 15psi the cam cover started leaking. It's there, it just hasn't found a way out yet. Once it does, you'll probably see a 2% power increase.
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Old 07-08-2010, 08:36 PM   #15
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Quote:
Originally Posted by m2cupcar View Post
Just because you don't see it, doesn't mean there's no blow-by. I had no issues at 9 psi with the stock system, but when boost was at 15psi the cam cover started leaking. It's there, it just hasn't found a way out yet. Once it does, you'll probably see a 2% power increase.
Don't hate, this is the first motor in 4 years that after pulling a charge pipe it's completely clean and dry.
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Old 07-08-2010, 08:41 PM   #16
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Never had any wet charge pipes- thanks to my vent system.
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