Quote:
Originally Posted by Bub Whitaker
Positive Crankshaft Ventilation, It's a hose from an intake vacume sorce, carb or intake manifold, that draws air thru the engine to remove water and fumes. What they are discussing here is using this vacume source to create a vacume in the pan by sealing off all breathers to aid ring seal, if it's good enough...
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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 ??