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Oil coming out the oil filler cap?

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Old 12-05-2017, 09:29 AM
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Default Oil coming out the oil filler cap?

I might be just panicking for no reason and the cap might just not have been tight enough, but,,,,

I opened the hood today, to find oil all around the oil filler.

Does the filler cap need a rubber O ring? there seems to be no gasket on the filler cap just a hard mating surface.

I recently installed a VTA oil catch can, dont think its related.

am i building pressure in the valve cover? i basically have both valve cover ports plugged into the VTA catch can.

pics attached.





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Old 12-05-2017, 11:28 AM
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Yes, it is supposed to have a seal/oring
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Old 12-05-2017, 02:26 PM
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Originally Posted by HarryB
Yes, it is supposed to have a seal/oring
thanks. looked at my cap, the seal is there, but its hard as a rock.

will pickup a new seal.
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Old 12-05-2017, 02:27 PM
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PVC related?
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Old 12-05-2017, 03:05 PM
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no, not unless the catch can is clogged
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Old 12-05-2017, 03:17 PM
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Start with a new seal, most miatas need one anyways.
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Old 12-05-2017, 03:49 PM
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is that PCV gutted?
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Old 12-05-2017, 09:32 PM
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Originally Posted by Braineack
is that PCV gutted?
pcv not gutted, but I blew threw it and it's open vc to im and closes the other way. I meant to get a hose barb connector to replace it. 1/2 inch right?

catch can is 10% full, I checked.

also catch can smokes when engine is running? Smoke is normal out of the valve cover?
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Old 12-06-2017, 08:34 AM
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the plunger is a big restriction inside the pcv, pressure from behind is actually pushing the plunger up into a position that further reduces the flow. They flow the most with zero pressure. Gutting one with allow a lot more pressure to escape the VC.


It's like drinking a slurpee with a chuck of ice stuck in it. doesn't work well until you dislodge it and suck again with a fully open straw.
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Old 12-06-2017, 04:30 PM
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Originally Posted by Braineack
the plunger is a big restriction inside the pcv, pressure from behind is actually pushing the plunger up into a position that further reduces the flow. They flow the most with zero pressure. Gutting one with allow a lot more pressure to escape the VC.


It's like drinking a slurpee with a chuck of ice stuck in it. doesn't work well until you dislodge it and suck again with a fully open straw.
thanks. i gutted the pcv today and tightened the oil cap as best i could, and took it for a spirited drive... 5-6 boosted runs later, and no leaks.

how much ventilation does the VC need? is running both ports to one catch can enough? i would think the single can with the tiny filter on top would flow much less air than two 1/2" hoses going to it.

should i do 2 catch cans, one for each port? or drill out the catch can filter hole fitting and install a 3/4 inch fitting and bigger filter?

running 15 PSI on the turbo.
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