Can valve cover breather hose stay open? - Club RSX Message Board
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Old 05-14-2019, 08:22 PM   #1
andezack
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Can valve cover breather hose stay open?

So I’m wondering if it’s ok to Put on one of those small filters or just run it open. The tubing won’t fit..I’m just wondering if doing this will harm my engine in someway
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Old 05-14-2019, 08:41 PM   #2
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It won't cause damage necessarily, but there won't be clean air to cycle blowby gasses out of the crank case. It can contaminate the oil (by my understanding) but that's easily remedied by more frequent oil changes.

An oil catch can in conjunction with a breather filter would be the proper way of doing it. Personally, I don't see the point other than engine bay bling. The amount of oil sucked into the intake is so minimal that you won't notice any difference in power.
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Old 05-15-2019, 01:05 PM   #3
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Yeah by running that open, that PCV breather is gonna suck unfiltered air into your crankcase. Now sure, it's not being combusted in any way but it is coming in direct contact with your engine oil and everything outside the cylinders.

If you pay for synthetic oil and good oil filters and air filters and so on, to me it would make sense to add this additional protection to your engine so you're filtering it at all entry points.

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For an RSX I think you need a 0.75" ID one, like:
https://www.kseriesparts.com/VIB-2164.html
https://www.kseriesparts.com/KN-62-1360.html
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Old 05-15-2019, 03:22 PM   #4
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Yea I ordered one of those..I may sound stupid but when I turned on the car it was pushing air out of the hole not sucking in
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Old 05-16-2019, 12:42 PM   #5
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I don't claim to fully understand it, but, the PCV loop is using that port as an intake during the conditions that incur blow-by, which is during WOT (at least). So during idle, yes, apparently the vacuum isn't present and thus there is air coming out, but that is not the path of the oil vapors (it's in through the port over by the alternator that runs to the intake manifold).
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