bcdavis

The catch can from Pegasus racing has one inlet, a breather on top, and a drain outlet...

http://www.pegasusautoracing.com/pdfs/063.pdf

It seems like you could plumb the oil drain fitting at the bottom of the can, to drain back into the engine, and let the vapors vent to the atmosphere through the breather...

Gretch

Thanks Tres, so far so good, but I will keep your offer in mind.

Blown Beast

I used a Moroso dry sump breather tank from Jegs #710-85470 $69.99 and removed the breather cap and welded a 3/8 NPT fitting on the top with a 1/2in hose barb for the vent.
This is the hose that goes to a clear fuel filter (to catch oil vapor) and then is plumed into the air filter box. This creates a small vacuum and eliminates the oil smell!!!!!!!

Next I removed the drain petcock and installed a 3/8 NPT-1/2in hose barb and ran the hose down to a 3/8 NPT-1/2in barb that I taped into the block off plate on my oil pan (to drain the oil back to the pan)

Lastly, I connected the valve cover vents with the oil fill neck vent and ran this into the (in) side of the catch can. The catch can has internal baffles and removes 99% of the aerated oil and then drains the oil back to the pan.

Gretch

BlownBeast,

Pictures man, pictures............sounds like a good plan. Does the system work when the engine is under boost?

Blown Beast

I don't know how to post pics... but you can see it in my tag photo. It is the can that is attached to the S/C bracket and you can see the vent line and red fuel filter that goes to the air box.

This set-up works great and in 4k miles I still can't see any oil in the fuel filter.

bcdavis

Just a note to those who might be tempted to just vent the breather to the atmosphere:

Even with a baffle, or a breather cap, or whatever, I still see a ton of fumes and vapors vent from my breather. I am going to redesign it to vent back into the manifold, after *removing* any oil mist...

I thought a simple breather would do the trick.
But it is WAY too smokey, fumey, and nasty!

Unless you like your car to look like it is smoking, and your engine is on fire, or overheating, you will need to vent your crankcase breather back into the engine, or into the exhaust, or you will have significant fumes and vapors drifting out from under your hood...



I'm going to use a PCV valve, to keep the flow to the breather can happening only when the line is under pressure. When under vaccuum, it will close, preventing the engine from having a vaccuum leak. But under hard acceleration, when the pressure builds, any vapors or oil mist will go to the can, and at the same time, I will make a splitter, to take the excess vapors, sans oil, back into the intake...

Until such time as I can get one of those exhaust vents.
That seems like the way to go.
Get those fumes out of the intake, and into the exhaust, after the cats...
But venting to the atmosphere through a breather baffle was not exactly successful.
(cough cough)

PorKen

bc - how many miles do you have on that dragon?

Old & New

I vent to atmosphere without any release of smoke (at idle, anyway). 143K miles on her.

Erik - Denmark

@ All.
Here is a picture of what I did - Simply a copy of the existing oil separator installed serial to the existing
The separated oil (most a oil dirty mixture of oil/water and gasoline) is not lead back to the sump - I simply empty the oil separator # 2 after hard driving - If you want to lead it back to the sump, I think the best will be to install a solenoid valve, open when the engine is off

bcdavis

I have a LOT of miles on my beast!

180,000 +

It has a lot of blowby, but I have good compression numbers.

My problem was that since I drive my car hard from time to time, the crankcase
gets so pressurized, that I would get oil leaks from the cam covers, etc...

Adding extra breather capacity sloved that problem...

No more leaks.

Just trying to figure out how to best set up the system...
I think the air pump setup is the best I've seen so far, but I do not have an air pump.
So I guess I'd rather re-injest those gasses, rather than vent them in a stinky steam cloud...

I just need to get a good oil separation setup to clear out any oil mist, etc....

I think a breather box or baffle, with open cel foam ought to catch most of it,
prior to the gasses being re-injested into the intake...

Lagavulin

So guys, what's the latest on these efforts?

John, how do you like your aircraft air/oil seperator?

bcdavis

Waiting to finish smog, then vent to the exhaust.

Ideally, I think a catch can would be good, for the oil.
But then some way to vent the vapors back to the air intake,
or into the exhaust. The ideal thing is to remove any oil
from the vent gasses. Then it is not a big deal where
the rest of the gasses go. But without good venting,
you will have excess pressure in the crankcase.
Which will result in small oil leaks...

I may "try" running a line back from my Pegasus catch can,
into my air intake. That way it will suck the vapors, but hopefully the oil mist
will stay in the catch can, and no more vapors will waft out of the breather filter.
I just want plenty of "room" for the pressure to vent.