Rb26 Catch Can And Pcv

[SiR_RB]

My r32 gtr Has a custom catch can where my battery was ( battery's been relocated to boot)

Now when I got the car the engine had the PCV valve blocked, inlet pipe on rear turbo blocked, and basically had 2 hoses from the cam covers going to the can, which was vented to atmo

I don't want this running to atmo anymore,

My question is: can I run a hose from the catch can where it vented to atmo, back to the rear turbo inlet so it "recycles" the crankcase fumes ?

Still keep the pcv blocked?

Have searched but didn't get exactly what I'm after

Thanks

[gotRICE?]

I think you will need the PCV connected. As at idle i dont think it will pull enough pressure/vapour out of the head.

You could just get one of those little tiny catch cans and run a seperate one for the PCV. Problem solved then

I had the same setup as you mentioned, and i got blowby at idle with the PCV blocked. So put it back in and problem was solved.

[scotty nm35]

+1

I run a similar setup, pcv plumbed into small sealed catch can then to the manifold and the main breather to catch then back to the intake. Both catch cans will need stainless steel wool inside them or they will dump oil fumes into the intake still.

I also setup two ball valves and some hose underneath them to make draining easy.

[linkems]

scotty does your second can between the pcv and manifold pick up much oil?

[scotty nm35]

Only a little, the VQ manifold was fairly dirty and covered in mucky oil and carbon before I cleaned it. Now it's spotless. The can only fills with moisture, ethanol and a little oil.

[linkems]

so it's definitely worthwhile to setup a second can if you plan on running ethanol? I was only planning to run one can on the turbo intake side

Edited July 10, 2012 by linkems

[SiR_RB]

Ok i re-routed my breather hose into my stock air box, and blocked off the rear turbo pipe inlet

[SiR_RB]

still not 100% clear as to why having the breather hose in the rear turbo intake, with the PCV valve closed wont work....but atmo it will ?

when the engine is on, isnt there always gonna be vacuum in the turbo inlets? i mean the engine needs to suck air to work right?

[SiR_RB]

Anyone ?

[linkems]

at idle/vacuum air will draw from the the driver side breather port through the pcv (one way valve) into the intake manifold.

Any time when you start making boost, the pcv will block and no air will draw into the intake manifold. Air is sucking through the passenger side breather to the the rear turbo intake.

I think in a idle/vacuum case the pcv side has higher pressure drawing in, and the turbo side isn't doing much. Plumb your can inline with the turbo side and reconnect your pcv like stock. Or plumb both sides up into one can, or run two cans alternatively. The turbo side will pick up all the oily fumes on boost. The pcv side only picks up oily fumes during vacuum situation.

here is the right way to plumb your can, every other way is probably incorrect

http://www.skylinesaustralia.com/forums/topic/40402-greddy-oil-catch-can/page__st__60__p__1179419#entry1179419

[scotty nm35]

here is the right way to plumb your can, every other way is probably incorrect

There are unlimited ways to plumb catch cans and some are much better than those ways you linked. Personally I would never vent a can to atmosphere, or drain the oil back, but each design has its merits I guess.

If you have oil filling the can you have much bigger issues, they should only be used to control the oil vapour and stop it lowering your combustion octane, or to stop oil condensation in the cooler and manifold imo.

[SiR_RB]

when i got pulled over into a defect station last week, the EPA inspector told me instead of running it ATMO to just run a hose from the breather on the catch can around to the air filters so they suck the fumes.....dunno if this is the "legal way" or not ?

but he also told me to put a cover over my pods....but i know that wont pass when i go to clear my defects