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- San Antonio, Texas
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- '15 CX-5 Miata AWD
Yea I decided against VTA for now, once I'm boosted If I need to I'll add a check valve with a breather to the can.
The stock PCV gives you completely opposite. At wot there is very little vaccuum in the intake, so the blow-by gases almost force their way out of the crankcase.
The intake vacuum is highest at idle, when it does nothing for the blow-by removal, not that there is a huge amount of it.
Mike, are you saying that they intentionally keep the high vaccuum in the intake throughout the rpm and load range??? Choking the engine at wot by magically keeping the throttle semi-closed? That's the only way to create the vacuum in the intake, by the way.
I used the word "almost", and you have to agree that the highest rate of evacuation takes place when the vacuum is at its highest. No venturi effect would produce over 15mm of vacuum that is observable in the intake at idle, unless the air in the intake goes supersonic. And only the air pressure differential causes the movement of gases in our case.The part I was taking issue with was your statement that the blowby gasses try to force themselves out of the crankcase at WOT.
Are you sure this is not the fresh air intake for PCV system? In any case, the blow-by has to find its way through there, meaning the vaccuum in the intake is negligible. So we agree on that. So PCV system at wot is not a ventilation system anymore, as it becomes evacuation system, with no fresh air dilution. I hope we're on the same page here.The The crankcase is also vented to the area under the valve cover which is vented to the air intake before the throttle plate. At wide open throttle there is a venturi effect at the outlet of this vent tube into the intake manifold that creates a vacuum greater than that in the intake manifold and this actively draws crankcase gases into the intake at WOT.
Just make sure it doesn't bond permanently with heat.
Had it detailed and Cquartz UK paint sealant applied. It is Georgous!!! I'll post pictures tomorrow