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Old 05-16-2011   #1
s1ngletracker
 
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catch can input/discussion needed

So we have a little homemade PCV pipe (bomb) catch can on the chumpcar. It was perfectly sufficient when the car was NA but now that it is turbo it blows tons of gunk out the filter on top of it, even though the can itself isn't full. I'm not sure if this is completely abnormal but I'm guessing the crankcase is developing a good amount of pressure at full boost/high RPMs.

I realize most people run a line back to the intake pipe (intake manifold on a non turbo car), but based on how much comes out the filter, I'm assuming that would end up in the charge pipes/intercooler and I would like to keep that from happening.

My current thought is to run a hose to a slash cut in the exhaust (to generate vacuum and pull excess pressure/vaporized goop into the exhaust as opposed to spraying all over the engine bay)

I'd like some help/input on possible solutions, has anyone had this sort of problem before? Compression numbers are fine on the motor so it isn't the motor failing.

We obviously can't run a high dollar catch can with internal baffles or anything like that due to the budget limitations of Chumpcar.

Thanks!
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Old 05-17-2011   #2
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Re: catch can input/discussion needed

the exhaust idea will work, a lot of old tech drag racers do that method still only they dont run a can just right from valve cover to exhaust.
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Old 05-17-2011   #3
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Re: catch can input/discussion needed

Why don't you connect a boost gauge to the valve cover and see what kind of pressure it's developing. The slash cut thing works, but use a check valve. The more you add, the better it'll work too.
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Old 05-19-2011   #4
s1ngletracker
 
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Re: catch can input/discussion needed

out of fear of fire risk, I have made a secondary catch can filled with steel wool. It goes from where the filter used to be to the bottom of the secondary, and the top of that one has the filter. We'll see if this fixes the problem.
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