Need input on crankcase evacuation remedies

[Motobrewmaster]

Here is a great article by Arrington Performance. It really explains everything very well and lays out various configurations and their Pros & Cons.

http://www.shophemi.com/images/media..._ccv_bible.pdf

Cheers, Brew

Oh and Lance your car is very sweet!

[SSLance]

Thanks Brew... And that is an AWESOME illustration that deals with my current issue.

I now understand how that at high load WOT conditions, PCV valves will close instead of staying open causing a foul air condition and ALL blow by gases to exit the engine via the vent which in my current case is just a breather meant only to allow fresh air into the crank case.

Considering how much time my engine spends at high load WOT...this is all starting to make a lot more sense.

I'm thinking option 3 from the link is a good fix, twin catch cans with no PCV valve. This way air plenum and intake vacuum is pulled from both valve covers at all times under all conditions and all air coming from the crankcase goes thru an oil/air separator first before entering the engine to be consumed in the combustion chamber.

Now, to just find a couple affordable catch can separators and ways to plumb them to each valve cover opening.

[woody80z28]

A -12 AN bulkhead fits the stock valve cover hole size perfectly I think it's 1.25 IIRC. I am running a single puke tank routed to one valve cover with an oil fill plug to seal the other. The crankcase is common from bank to bank, so I think I should be ok. -12 is huge.

I read that bible too, and it helped make sense of it all. I stalked build photos on DSE's site and saw they consistently used one puke tank, so I figured if it's good enough for them, it's good enough for me. Simplifies plumbing and reduces cost, too.

Hopefully it works well. I'm still in the build stage.

[WSSix]

Glad you posted this, Lance. I'm wanting to make sure I get mine setup correctly too since my engine is due back soon.

I've got one of Mike Norris's catch cans on order now. It's a nice piece. I'll be hard lining mine since I have room to mount it on the front of the motor near where the factory PVC lines already run.

[SSLance]

Most of you know I'm a visual guy...here is a picture of the setup I'm leaning toward.



I took my PCV and breather assemblies apart this morning and I think I can modify and use these for the Valve cover side of the plumbing.



And here is the hole in my air cleaner housing for the clean air side.





Now I just need to figure out if I can get by with one catch can or two and put the plan into motion.

[SSLance]

So, just had a long conversation with David at Mighty Mouse and I placed an order for some parts. He's a good dude who understands this issue well and helped me decide what I needed without going total overkill for my setup.

We went with his PCV can with both a breather on top, an additional recirculator top for the can which will let me run a line to an additional catch can if needed during long road course sessions, and a brake booster mounting kit.

PCV Can
Fitting 2: 3/8" Hose Barb
Fitting 3: Oil Sight
Price: $200.00
http://www.mightymousesolutions.com/.../pcv-tuner-can

'Recirculator' your can
Fitting:: 3/8" Hose Barb
Order Type:: Old order upgrade
Price: $50.00
http://www.mightymousesolutions.com/...lator-your-can

MM Can Mounting Kits
Mounting Kit: GM Truck Booster
Price: $20.00
http://www.mightymousesolutions.com/...-mounting-kits

This setup is good for up to 600 HP.

The recirculator top is a backup in case for some strange reason I fill the catch can up with oil during a long road course session. With the breather top it would just push the oil out the breather and make a mess and be unsafe. It is very unlikely this will be an issue but I want to have the recirculator top with me the first couple of track days just in case. If I end up not needing it, he'll let me return it as long as it in in resalable condition.

The install plan is to gut my current PCV housing and use it to plumb the driver valve cover to the inlet side of catch can. The can has a PCV in it which will be plumbed to the intake vacuum. I'll get another PCV housing just like the one I have, gut it, put it in Pass side Valve cover and run it to the bottom of my air cleaner housing for a fresh air intake to the crankcase. Boom...Should solve any crankcase ventilation and blow by issues, keep oil from spewing down the side of my valve cover and might even help with the garage fumes from time to time.

[dontlifttoshift]

FWIW, I have never had any luck with those billet PCV valves, even on cars that don't get driven in anger.

Instead of buying another billet thing to gut and ending up with just a 3/8" line on the clean side to the air cleaner, grab one of these with a 5/8" nipple.



The 5/8" will keep your engine will keep your crankcase from going positive pressure in most cases.

[Ron Sutton]

I love the Arrington race catchcan V2. It is simply the best design. The only drawback is cost.

We offer a "good one" from Moroso for about half ... at the bottom of this page HERE.

[SSLance]

Alright, 90% of this project is installed and operational. All I'm waiting for is the Pass side breather I ordered to show up so I can plumb it to the bottom of the air cleaner, for now I've just got the old open breather on that side.

Here's the can hanging off the airbox right behind the headlight.



The 3/8s lines running from the can to the now gutted PCV breather on the valve cover and manifold vacuum port on bottom of carb.



And I can even see the site glass by looking under the core support by the charcoal canister...




This setup is pretty sweet, here are a few pictures of the top of the can, inside the breather top and even inside the recirc top for you to see as well.







There is a check disc inside both the open breather and the recirc top that lets air flow out if needed but when vacuum is put on the can it seals the top off.









If any questions just ask away, I think I now have a handle on how all this works and can't wait to try it out under sustained WOT applications...

Thanks for all the help with this guys...sure hope it cures a few ills I had last season.

[cluxford]

Interesting thread thanks for sharing. I run two catch cans, with only breathers and no connection back to carb so it just escapes to atmosphere. My car stinks so bad the family won't go in it. I am re-thinkng the set up to get fumes down and family in