Oil Catch Can

[Coop]

Dave, on the other site, you made a catch can, that vents the PCV valve. The question is the line at the front of the valve cover that feeds right ahead of the TB, should that also be vented ?

I am doing a catch can, I have a round one, not sure where it will get mounted, but I believe I need it because at the track I get some oil burn after a hard left, followed by a right, and lately it happen more often. It's been bad enough that in the last year, it has triggered the check engine light

[repiv]

Next time the CEL goes off, see if you can detect a code and what it might say. That will be very useful in further diagnosis.
As for the catch can, I spliced both the PCV line and that front breather line with a "Y" into the same vented catch can. The end of the PVC line that goes into the intake manifold just gets plugged.
The schematic shown in the Helm manual indicates that the manifold vacuum pulls vapours out the PCV line and "fresh" air goes into the front breather. However, under certain conditions, that front breather vents outwards, along with oil vapours. I decided not to use manifold vacuum to draw out crankcase vapours, but rather, just allow the positive crankcase pressure to vent itself directly into the catch can.
Now, if you choose to use a non-vented catch can (closed circuit), then you shouldn't be infiltrating the front breather line. A closed catch can needs manifold vacuum to complete the task. Putting that front breather on the same line wouldn't allow for vacuum to be maintained.
Under the conditions you describe for your situation, it is quite conceivable that you are getting oil coming out of both the front breather and the PCV. An open system like mine would solve the problem. If you go with a closed catch can, then hook it up in the PCV line and keep manifold vacuum. Then you can incorporate one of those little filters that you clamp onto the front breather (plug the other end that goes into the intake). If you track a lot, you will need to clean it between track days.

[Coop]

thanks

[S2Kr]

Ever heard of "Krank Vents".???

[repiv]

Ever heard of "Krank Vents".???
Quite a bit talked about in other forums about these. I see them as being very useful in Forced Induction where the PCV system still uses manifold vacuum to draw crankcase vapours out and to prevent manifold boost from going into the valve cover (and hence, into the crankcase). In my case, where I don't use manifold vacuum and a vented catch can, it's of little benefit.
Also, in a NA engine, the intake manifold is always under negative pressure (vacuum). I've seen some guys put Krankvents on the front breather. This would be a bad idea since under certain conditions, fresh air must be able to be drawn into the valve cover and that's what that front breather is for.

[Coop]

today I started making a catch can from a compressor filter. As soon as I can I will show you what I have done, I will post some pics. It is tied to the shock tower bar and the hoses flow nicely without any binding. To clean it out, I just need to remove the air filter cover, unscrew the plastic tank and dump it.

I also vent both hoses coming out of the valve cover, as the inside of the TB was cover in oil, so I did the front hose too.

Also the first weekend in March, I will be at the track so I hope to see how it works.

I would also like to make a mounting bracket or fine a better way to mount it. Maybe Curt or someone else can cove up with an idea.