Crankcase Ventilation
Thread Starter
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
Crankcase Ventilation
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 .
What have you used or are using that does the job well .
Melting Slicks
Joined: Feb 2006
Posts: 3,105
Likes: 96
From: Sunrise FL
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).
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).
Last edited by mikem350; Jan 28, 2015 at 08:07 PM.
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 112
From: Michigan
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
FYI headers evacs don't work with mufflers
Safety Car
Joined: Nov 2008
Posts: 3,707
Likes: 550
From: Seattle Washington
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
FYI headers evacs don't work with mufflers
Thread Starter
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
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
FYI headers evacs don't work with mufflers
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 112
From: Michigan
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.
Burning Brakes
Joined: Oct 2010
Posts: 1,160
Likes: 23
From: Prescott AZ
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.
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Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
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
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
Last edited by 68post; Jan 29, 2015 at 02:37 AM. Reason: no
Safety Car
Joined: Jan 2009
Posts: 3,736
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From: anchorage ak
DO MA NEU!
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 112
From: Michigan
Again as I said earlier you can't use header evac with mufflers
Racer
Joined: Jul 2008
Posts: 338
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From: Bowling Green Kentucky
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 $$$$ for the return in HP.
I run Moroso breathers in each valve cover on my pig.
IMHO a vacuum pump on a street car is not worth the $$$$ for the return in HP.
I run Moroso breathers in each valve cover on my pig.
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
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.
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.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
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.
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.
DO MA NEU!
Burning Brakes
Joined: Nov 2012
Posts: 788
Likes: 100
From: Indianapolis IN
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.
Racer
Joined: Feb 2007
Posts: 307
Likes: 0
From: liberty mo
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
DO MA NEU!
Thread Starter
Safety Car
Joined: Jan 2009
Posts: 4,000
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From: New York
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 ?
So why would this not be a good system ?