PCV, advantage or not?

[Bub Whitaker]

Originally Posted by trmnatr

Bub,

How about running one valve cover with two holes and one with one hole

In the one with one hole you will have a header e-vac, on the cover with 2 holes you will have a header e-vac and a pcv valve + header e-vac through intake valley with baffle so it doesnt suck oil.

Wouldnt this give you good breathing if you couldnt run a vacuum pump as the pcv valve would work great at idle then close WOT BUT @ WOT the header e-vac would be working by pulling vacuum in the heads and lifter valley ??

How much better would a header e-vac work if you had one in the intake too ? With the header e-vac in the valve cover it has to pull from limited area (pushrod holes, drain back holes etc) and as we know oil can get up in the heads and not drain quick so maybe we also cant pull enough vacuum quick enough through drain holes etc. This way with 3 header e-vac's

Any Thoughts ??

What you want here is what I use on Superstock engines, Delco FB101 breathers that have 5/8 hose nipples and I bore the top 3/4 for a brake booster valve that seals when not being sucked on with hoses T'd to the PCV port on the carb. Don't do this to an intake runner as it will screw up that cylinder. EGR valves on tubes in the collectors at 45 degree cut to draw when exh velocity gets up to take over when intake vacume diminishes. the EGR valves on the collectors also seal the same way as the brake booster valves so there is constant vacume in the crankcase...