Well i decided today to make a DIY catch can. So i started off with a compresser filter for a air compresser i got at walmart. This is how i hooked it up. I connected the one end right into the top of that black box where the pcv valve used to be. Then i took the other end and needed to do something for pre-turbo vaccum. So i took a small piece of piping and put a 3/8 fitting into it about a inch away from the turbo and about a inch away from my filter (aka metal screan). So i was curious to if this will get good vaccum for it to work propperly?? Here are some pics!




The hose coupler is connected directly onto the turbo.

 

get a better filter for engine longevity. you have it correct to have positive crankcase ventilation. good job

 

yea, im planning on it. I just got to clear up some room some how becuase that metal screan is actually tutching my dump tube right now. Its pretty cramped.

 

Hey its been a couple days of driving it with the homemade catch can and i havent really seen any oil build up in it yet? Is this normal? I just hope its getting good vaccum.

 

Im not sure if im 100% correct on this one, but I dont think you should be getting much oil unless there is a lot of blowby in your engine. It may be doing a good job of releasing pressure and gasoline vapors without filling up with oil.

 

actually i read a very long article on this...

i had origionally planned on using a mid-80s electric vac pump for the MC as a vac for the venting of the crank case. BUT i guess i wan't gonna be the first with that idea, because without resistors and extensive wiring the GM vac would have too much vacuum and end up sucking out oil.

So i read up on the second best method. Putting an attachment to the exhaust after the cat/test pipe with tthe exit facing the muffler causes almost the exact amount of vacuum that is acceptable. BUT running a catch can is a great idea so you don't burn off liquid oil and alarm yourself and others under hard acceleration.

But from what i understand older domestics can gain about 30+ HP from having some decent vac to the crank case, so on hondas you'd expect something..but not really. If anything the engine runs smoother (so i read) and it helps to extend engine life, especially under boost.

w00t