pan evac system
 

has anyone used one or does anyone use it? pressure gets high in the upper rpms and sometimes blows by the front seal. i can drive it around normally and have no issues but 5k plus she will toss some oil out. i would like to cure this but some say mufflers will affect the set up and not allow the pan evac to work.. any help???:ty:

dumb Q, but here goes.

a buddy had a large line from his valve covers, down into the collectors on his headers.

how/why/what was that supposed to do?

can the normal PCV not bleed off pressure quick enough at those RPM's?


<just wandering out loud, trying to generate some thread drift...>

A PCV valve has no place on a Hi-po motor.

The header mount evac setups do work, but they work best w/o mufflers. If you do run mufflers, it better be a good system with straight through style mufflers...NO flowmasters. Any backpressure in the exhaust system will cause it to pressurize the crankcase. The nipples welded into the headers cause a siphoning effect and draw pressure out of the valve covers. This is the cheapest route.

I run a vacuum pump on mine, works better than the header mounted evac tubes, makes more power, but it costs a lot more.

You could just run some good breathers, like the Moroso valve cover mounted open element breathers...the ones that come with the tubes so they sit above the valve cover. They just fit in the normal 1.25" hole that most valve covers come with. You can put a piece of steel wool (brillow pad) in the tube under the breather and that will drastically help with oil spewing out under power.

the mufflers are magna flows. dont know if that helps. i may try the moroso breathers first. dont want to go the pump route unless absolutely necessary.

The moroso breathers with a brillow pad stuffed in the tube REALLY helps. I ran that setup before I finally went to a pump. I was trying to get by, but my motor really needed the pump on it.

good write up.

i have a PCV on the passenger side, and a big MOROSO breather on the driver side valve cover.

so i am stuck in the middle, it seems.

i sorta thought the PCV was to put a suction on the bottom ring on the piston, and make it seal better.

??

I've heard you can hook up the lt1 smog pump to work like the vacuum pump and its electric. I still have a working smog pump that's not being used that's a lot cheaper than the VP. PM if interested.

it pulls the stuff thats not suppost to be in your motor out of your motor

Creating a vacuum in the crankcase does help ring seal, but a PCV valve is dumping that oil mist right back into the intake manifold...NOT where you want it to be going.

Either just use vent breathers, or take the low buck approach w/ the header evac setup. If you have the money and have a motor that either has a long stroke or uses low tension rings, then get a vacuum pump. I'll only use a belt driven pump, the electric ones aren't worth it in my opinion.

unless you put an water seperator in-line, which will grab most of the oil before it gets back to the intake. :mrgreen: :hide:

...and if you see how much oil they collect, you definetly would not want to run a PCV system on a high hp motor. I have heard oil in the intake/air stream will lower the octane of your air/fuel charge

Race truck

You can buy an electric vacuum pump for about $80. They work plenty good enough for what you are trying to do.