Do you think this will work?

[lineslinger]

To keep my engine from blowing oil mist out the breathers and all over the engine I rigged up this configuration, the small canister on the back has a one way filter disc in it, as well as some stainless steel wool, the disc will allow gasses to pass through it but not liquids, so in theory gasses only will be carried through to the intake but any oil or oil in the vapor will be restricted/contained in the lower end.
I am assuming there is enough vacum as well as enough crankcase pressure to make let this configuration breath/circulate properly, what do you guys think, I would like to hear your feedback.
Mark

[Morris]

Mark

That will not work...on a BB..... it's not large enough..... especially if you are making any HP at all....

And the filter in the container will clogg up with oil and stop passing air.....

We had too go to a 3" breather and run the back of the block and the bottom of the block to the tank.....

Plus a 1 1/2" breather on the Dry Sump tank....

Big motors need lot's of venting....

Morris

[lineslinger]

So Morris...
If I increased the size of the "tank"/filter housing, would that solve the capacity restrictions or do I need to increase line diameter as well?

[blykins]

Mark, have you had problems with blowing out oil?

I didn't use the PCV in the back of the intake...I used a PCV valve in one valve cover and a breather in the other. I didn't have any problems whatsoever with blowing out oil.

[trularin]

There are several people on the site that have high RPM blowby causing oil to be pushed out of the breather.

I certainly have the problem and have settled on a rag tied around the breather. It used to be much worse, but JP was kind enough to give me a breather that cut it way back.

[mj_duell]

I believe Morris is right. FE's need tons of venting. I love your solution however, but it won't flow well enough. I used trularin's solution while running at the track.



--Mike / Turn Ten Racing, Inc.

[Morris]

Mark

We had to get into this issue from the dyno to the chassis.....

If you are going to just be on the street ....it will probably work OK.....

But the minute you get on a track..... the pressure inside the block moves very fast and there is a large volume of air to move.....

With your line....the speed of the air is so fast that it will plug up the filter arrangement you have ...... and if you make the can or filter larger....the speed of the air inside of the container will slow down ....but then speed back up as it tries to exit......

When the air slows down inside of the container ...it will be depositing the oil on the filter and end up plugging up the filter ......

Your lines need to be large so the speed of the air will be much slower and not push the oil out of the motor.... and the container needs to be larger and if you want to use a screen ...use a Scavenge pump type of filter that has a screen in it but not a close knit screen....one that is open like 1/8" holes...... that will break up the oil and air and because the air is traveling so slow it falls back into the motor....

We ended up running a -12 line at the back of the block.... to the breather....and a -12 line from the bottom of the motor at the mechanical fuel pump block off plate to the breather can ....it had one of those Scavenge filters inline before the Breather container.....

Here's a photo

Morris

[SJK2]

What about original breathers??

[Morris]

And here's the other side of the Breather catch can.... where the back of the block goes to the breather......

BTW..... 90*degree fittings are good in a breather line.... worth 10' feet of additional hose....

Also....remember ...on the street ....it''s OK.... but a track is a hole different set of conditions...

Morris

[lineslinger]

Guys,
First I thank all of you for the input.
Brent, my preliminary set up was three breathers, one on each valve cover and a third at the back, no PCV outlet, I knew I would need it but wanted to work my way up to it. After 40 minutes of original start up/cam break in I found a film of oil on on the base all three breathers, where upon I came up with the configuration shown above.
I don't have any track time planned as yet, but before I drop this motor into the car I want to solve problems such as the one being discussed.
Morris, I get your meaning, "a large volume of air to move" is the key phrase, I can see how the one-way filter disc would act as an oil filled clog and there may even me enough vacum due to air speed to collapse the hose?.
Is the catch can in your engine bay a custom fabrication? Looks like it, and can I ask what, if any filter medium are you using inside of it, or is the size of the can itself enough to control free floating oil.
Tru, are you running the type of breather SKJ2/Steve is providing a link to?
Mike, thanks for the confirmation, I know Morris knows what he is talking about but confirmation always helps.
Now if I am running street only, and I add the original catch basket as well as removing the filter disc, does that still leave me pi$$ing in the wind?....kind of?, I can also move up two sizes on my filter container as well, or maybe make all the changes mentioned?
Thanks for the thoughts fellas, your input is truly appreciated.

[Tim Brewer]

Have you thought about a crankcase vent system that attaches a hose to each valve cover, and then goes to a one way valve right befor the collector on the exaust? That's what I have and it's works great!

[jaxssnake]

lineslinger,
try Gessford machine they make a nice setup similar to what you have.They make a manifold plate that has a steel wool basket that drops into the manifold and has a pcv valve that fits into a rubber grommet in the plate itself I then ran hard tube to the same location in the maniofold that you did.I only have a short piece of rubber between the hard tube and pcv valve. It works great. no blowby anywhere

[RICK LAKE]

Lineslinger I run a pcv valve in the r/s valve cover and a breather cap in the l/s side. Up till this point I have had no problems with oil spray. Morris has a race motor and a $700.00 dollar Ventalition system on his car. When they raced at R&G I saw no oil and the car got a good work out. It sound like you have a possible one of two problems, too much crank pressure or too much oil staying in the valve covers. Get a low pressure gauge and road test the car and see what the pressure is in the motor, if high could be blowby from the rings not sealing. If not make sure the oil returns are working and clean. Right now my system of $12.00 is working as good as Professor Morris. Oh Mr. Morris if you read this, thanks for the christmas bill for new springs. Rick Lake ps thanks for the timesert also

[Morris]

Hey Rick

How's your motor doing...... I hope well and you have all winter to play with it....

I look forward to seeing you back there again next year..... and this time we'll play out on the track.....

Morris

[Jamo]

lineslinger

Since I don't like to assume, do you have splash plates in the valve covers under the breather holes?

I run two K&N breathers...one on each valve cover, plus a line from the back of the manifold to the standard oil separator on the firewall...just some mesh in the plate. There's a line running from the top part of the old lawn mower gas tank down to the frame to exhaust the vapor, and a line at the bottom to let any oil drain back to the pan....standard Cobra BB fare back in the day.

No pcv valve...never could figure out why folks like to splash oil (even wet vapor) on their plugs.

That's on a big damn 482ci Shelby running a big damn cam with my big damn foot in it most of the damn time. Works damn poifectly.

Now, you can go ahead and reinvent the wheel...but the original round ones still roll the best.

[lineslinger]

Jamo,
I do have the splash plates on the interior of my valve covers. I know exactly the type of lawn mower fuel tank you have, it might have come off the lawn mower I pushed around for most of my adolescent days trying to make a buck.
I am going to put the seperator basket back in place at the rear of athe intake manifold and move up a couplle of sizes on the upper tank I am now using.
If I still get blowby at that point, I guess I will drop back and punt to what is considered standard setup, not trying to reinvent the wheel, more like trying to avoid building one.
Your description of the accepted setup makes sense with my limited thought patterns, if you have any pics floating around post a couple of your configuration would you?
Morris and Rick L., I was sneaking around at the R@G, which car belonged to Mr. Morris?
Thanks for the responses guys.

[Morris]

The one with the Wing and Splitter/Air Dam..... Red Stripes

[Jamo]

Here ya go...

[Jamo]

This shows the separator a bit better. The top transparent hose facing the viewer drops down to just below the frame so that the wind sucks the vapor out. The one draining from the bottom simply goes down to the oil pan to a tube next to the oil level tube which you clamp the hose to. I use clear tubing simply to see what's going on.

[lineslinger]

Thanks for the shots Jamo,
Seems such a simple way to draw the vapors out, just the vacum created by the air passing under the car, wouldn't have thought it would be that easy.
The configuration of having the return line from the collector tank to the oil pan........you don't have any reverse pressure problems there? Oil dosen't try to climb up the line into your collector tank? Either way thanks for the explanation, gives me something to think about.
Also are your valve cover breathers the double eared screw in type or the slip fit style that uses the rubber grommet, looks like they offer a lot more "breathability" than what I have installed.

Morris,
Is that you adjusting the wing on the Cobra? Beautiful car, I was impressed with the way you had it laid out. I got some shots of you running down the straight, your engine has a great sound to it.
Mark