yes i searched......now my question is...Honda routes the valve cover breather back into the intake charge pipe, i would assume this is done for emmisions reasons, however, is it possible that it causes vacuum from valve cover hence vacuum throughout the motor by pulling through the intake? See if left open or routed under the car or with a "filter" on it , its only "blow by" when attatched back to the intake charge pipe there is actually vacuum on that line...or at least i think there is...so that is my question.....is there more than just an environmental reason to route the valve cover breather back into the intake charge pipe??? could there be any horsepower there??????????

 

There are two ways I see it.

Some honda engines use a slashcut tube in the intake which instead of sucking air will route more air into the valvecover and help force blowby vapors out at WOT. (the slight increase in pressure from the slashcut will cause a pressure differential before and after the PCV causing it to open)

Some other honda engines use a flush cut tube, which sucks oil vapors out at WOT.

When not at WOT, the vacuum from the IM opens the PCV valve and lets blowby vapors out.

The problem with just putting a filter on, is there is nothing aiding the removal of vapors beyond the pressure in the crankcase itself. The blowby vapors are going to travel the path of least resistance, and with out any aid often times that path is around the piston rings.

The best method IMO, is to run a catch can between the PCV valve and the intake manifold, and install a slashcut tube. This keeps the crankcase ventilated, and properly displaces the blowby with fresh air.

 

Thanks.....well explained