diehrd

Anyone have any good advice or experience with a good quality way to ensure the crankcase is vented oh a higher hp performance motor

What have you used or are using that does the job well .

mikem350

Well, you did not give details on your set up, but following a stock system will work.

Or, I use a PCV on one valve cover, and a breather/oil fill on the other. Very common way. Make sure your breather holes are baffled if using custom covers.

Plumb w 3/8 hose to 3/8 size port on either carb or manifold (use a dedicated port).

BOOT77

If you use an electric pump the fuel boss cover is a easy good spot. You can buy a cover with a AN fitting or make your own. If you still got a mech pump, I've welded a tube onto the adapter in the lower corner. Buy some cheap clear hose at your local hardware store hose clamp and run either of those to a remote breather tank.

FYI headers evacs don't work with mufflers

Gale Banks 80'

You sure caught my interest on this one. Since I have fabricated Valve Covers that have no Baffleling and I have issues sucking Oil. So what happens in this regard of sucking Oil down in the Fuel Pump area ?Since it is far enough down, and the vacuum source is higher up the Oil should naturally want to run back.

diehrd

Thats interesting do you have any pics or information on this type of set up ?

BOOT77

If you mean pulling vac like from a pvc you shouldn't down there. I know a vac pump will get too much oil mist from that area. You could prob get some baffles tach welded on the inside of the covers or maybe route your line thru a sealed tank. Some kind of tank you could with baffles and a drain would be more ideal, but a simple inline fuel filter could work. Just depending on size idk how often you'd have to change/drain it. Also vac pumps pull from the drivers front to get less mist so depending where you have your pvc located. The direction of the rotating assembly sucks one side some and restricts the other some.

BOOT77

It's kinda hard to see, but I'll try and get a shot of it on the car tomorrow.

vetteguy22

I have seen issues with the motor sucking enough oil if it is ported to the carb or intake manifold that it can start fouling plugs.

68post

Some know this, and some don't , but you don't want to use a stock or any type of pcv venting on a hi-perf engine. You do not want oil vapors pulled back into the intake.

There are breather/tanks (air - oil separators) that you can plumb into the upper part of the oil pan, or as mentioned use the fuel pump boss, or the intake manifold can have a hole drilled into it too. The tanks will have a petcock on the bottom to drain any captured oil.
They're cleaner than just a breather on a valve cover.

Look in a ; Stef's, Moroso, or Canton catalog, or any circle track vendors.

Stef's Crankcase/Oil pan vent system ; part #5130 for aluminum pans , and #5132 for steel pans.

http://www.stefs.com/catalog/2022tanks.pdf

bluedawg

The best way is with a mechanical vac pump, I'd guess the second best way is with a header evacuation system.

DO MA NEU!

BOOT77

WOT there is no vac and the pvc shuts


Again as I said earlier you can't use header evac with mufflers

HBZ_81_C3

If you go to a mechanical/belt driven vacuum pump, you will need to also install a regulator so the system does not pull too much vacuum. Too much vacuum will starve the wrist pins for oil in a street application.

IMHO a vacuum pump on a street car is not worth the $$$$ for the return in HP.

I run Moroso breathers in each valve cover on my pig.

mikem350

Check the L88 PCV system..yes its got one in the stock valve covers

68post

Since we don't drive around at WOT ..the pcv will introduce the complete intake tract to oil .
Runners , back of intake valves, and combustion chambers - where it can very well cause spark knock. This is severe to a true high performance engine !

It is just an emission device , and the other emission devices that get omitted never create as much concern as a lowly pcv.

BOOT77

You know what they say about opinions.

Well got my community service in and answered a few question bout this n that GL

bluedawg

I plug my baffles with scotch Brite pads, filters out the oil.

DO MA NEU!

68post

Not sure if you have an open system, or it is plumbed into your intake, but I'm sure you've seen race cars with a shop rag tied around the valvecover breather to catch excess oil.





BOOT77, I'm not disputing that a header evacuation system will not work with exhaust backpressure , or that the factory emissions system isn't adequate for a stock engine. I'm not here to argue with anyone including yourself.
It's not my opinion - but a fact that a race engine doesn't incorporate a crankcase breather setup that pulls vapors into the intake tract for various reasons.

kwplot34

I have been running this set up for 5 years now, works very well.
http://www.gzmotorsports.com/

bluedawg

It's plumbed I to the carb, the other side has a grommet and a breather. The grommet was a blind, but I drilled 3-1/8" wholes so that the flow was reduced. I don't have much blow by, but when im into it I would get oil at the pvc, the scotch Brite pads allow it to breath but make it harder to get oil back.

DO MA NEU!

diehrd

Those questioning the exhaust evacuation , you do know it is supposed to be welded to the collector right ? It is the movement of exhaust gases that draws the crank case vapors out at least as I understand it.

So why would this not be a good system ?