was wondering if its ok to just run a small filter off the crankcase instead of running that hose from the intake to the valve cover, saw some debate about it on the internet

does it really make a difference whether or not a small filter or hose is ran?

what are the advantages, disadvantages?

thanks fellas

 

i heard the filter doesnt make a difference, the reason people started putting filters on the valve cover is to keep the air in the intake cool.

when u have the hose from the valve cover to the intake it throws hot fumes into the intake causing a decrease in hp, and an increase in manifold temp.

very minimal gains if any from this. I wouldnt go ricer and put a filter on my valve cover.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by digital sol &raquo;</TD></TR><TR><TD CLASS="quote">was wondering if its ok to just run a small filter off the crankcase instead of running that hose from the intake to the valve cover</TD></TR></TABLE>

I think you are confusing a valve cover breather with a crankcase breather filter.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by typer2k1 &raquo;</TD></TR><TR><TD CLASS="quote">the reason people started putting filters on the valve cover is to keep the air in the intake cool.

when u have the hose from the valve cover to the intake it throws hot fumes into the intake causing a decrease in hp, and an increase in manifold temp.

very minimal gains if any from this. I wouldnt go ricer and put a filter on my valve cover.</TD></TR></TABLE>

Air flows INTO the valve cover breather, not out of it; hot air does not normally flow from the valve cover into the intake via the breather hose. I say normally because some aftermarket intakes do not incorporate a proper "slash" cut angle to the bung on the intake arm that connects to the valve cover breather hose. If the bung is not set at the correct angle, then yes, the movement of air through the intake can scavenge air from the valve cover.

 

Yeah, like BatoutaJasma said, there 2 separate things, crancase ventilation (PCV) that goes from the crankcase to the intake manifold (top center). The other is the valve cover breather that goes into the intake pipe somewhere.

Not much difference in sticking a filter on the valve cover, except you're more likely to drip oil from there than otherwise. You probably get some decent air flow out of there at WOT, since there's not a vacuum in the intake mani to suck that air through the motor, so maybe you'd see a miniscule gain at WOT.

Disadvantages of taking out the PCV or otherwise venting there, would be that you'll have to run a catch can, and sludge can build up in the crankcase faster because it doesn't vent out the vapors from blowby as quickly. The vacuum in the crankcase that your intake mani generates is a good thing. You might see a slight increase in power.

Anyhow, YMMV, I'd leave well enough alone on anything but a boosted or race motor. I personally wouldn't leave the OEM PCV connected on a boosted motor, since the pressure can hold the PCV closed and you'll build up crankcase pressure to be releived either in the valve cover breather or the dipstick tube.

-Chris