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Originally Posted by 99gst_racer
Even if you run the dual can set-up like in your diagram, you still have to run a PCV valve, and you'll still have a boost leak.
And if you wanted, you could always run a single vented can, with two inlets, as apposed to running two catch cans.
Have you ever considered using the exhaust for a negative pressure source to pull the pressure and blow-by from the crankcase?
We are discussing this over on dsmtuners right now, and I am one of the people concerned about blowby contaminating my engine oil. But I still have not decided which method is best to use.
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As shown on the diagram it does have the PCV valve, and the
potential for a boost leak. If you don't think the PCV valve is good enough you can find high quality high pressure check valves in any store that specializes in air fittings and use that instead. You do need a strong catch can that will not collapse under vacuum though.... I didn't consider this untill it was pointed out by someone else. I have a simple cylinder that would hold up fine, but some of the "box" type catch cans will collapse under vacuum.
A simple vented can is better than nothing, and is in fact what I am running now since I don't have a vacuum fitting on my sheet metal intake manifold to connect to the PCV valve... but without the PCV system operating you will end up with more contamination of your oil system. I used to do oil analyisis once in a while just to see how things were going in my engine, now I will be doing it every 5000 miles without fail.
Keith
