Yes, or more precisely, the manifold vacuum's negative pressure sucks air from the crankcase via these lines

The other pair of tubes that go to the sides of the intake tubing feed fresh air from the intake to the crankcase.

The V-shaped nippes on the front of the manifold. The manifold vacuum that sucks crankcase gases into here is generated by your engine's desire to draw intake air. So all manifold vacuum inlets are effectively engine-breathing-air inlets. Anything you stuff in them gets burned by the engine eventually.

Yes. Ideally a can with some sort of baffle/mesh system. The V-shaped ports in the center would be the clean side(s) of the can(s), then other end is what you want the baffles/mesh to trap stuff from.

I get it now, thanks wstar! Repped.

Does anyone happen to know if the PVC tubing in the Z is 9mm or 15mm ? Greddy cans have to be ordered with one or the other fitting size.

Go with the 9 mm.

Thanks !

I thought this was a rather funny product description for a Megan Racing catch can setup available at a site for enjukuracing:

"The Megan Racing oil catch tank will hold this oily by product by removing it from suspension within the air intake stream. By doing so, horsepower is then increased by eliminating the engine."

Link: Megan Racing Universal Chrome Oil Catch Tank - Enjuku Racing Parts, LLC

On a side note those little Circuit Sport 250cc cans also available at that site look pretty cool but I don't know about those top mounted filter deals. Seems it would then be an open air system hence losing vacuum/pressure.

Pretty convinced I am going to run two cans though for the stock setup (no M370, no FI) ... I think personally it makes sense to do so as the motor was designed to breathe the way it is setup so I don't know about blocking anything off and forcing it to breathe differently.

FYI that's impossible. The PCV goes to the crank case. The inlet tubes suck air out of the valve cover. The manifold and the inlet tubes are always always in vacuum unless at wot when the mani is at zero or in boost when its +psi. Air can't get sucked into the inlet tube from the outside and then get pushed into the crank case as the crank case and valve covers are always having pressure built up. All those hoses are out's, not in's. that's why the valve covers and cranks vents are hooked up to two different vacuum sources. They are always pulling pressurized air out if the block and valve covers. Only at WOT does the crank case vents get blocked off when the PCV gets pushed closed. But the valve cover vents are always getting air sucked out no matter If you're at idle, wot NA or TT.

Hate to tell you this, but you're wrong.

Our cars don't have a true PCV system apparently, it runs in a vacuum, or at the bare minimum, it is vacuum assisted when at low RPM. At any rate there is definitely an IN and an OUT.

They suck metered (and filtered) air from the intake tube through the crankcase and out the outlet to the intake manifold.

Poorly made diagram attached.

RED: Filtered air into crankcase
GREEN: Air from PCV valve to can
BLUE: Air from catch can to intake manifold (vacuum line)

http://www.the370z.com/attachment.ph...1&d=1371060954

Nice job! That looks awesome!

Thx brosef!

If you want to do the same setup I can give you a parts list and info on how to fabricate your air/oil separators to go in the cans.

Total parts cost with everything was like $80 with shipping.

Can I get in on this too?

Maybe I should do a DIY or something... I didn't take a lot of pictures because I was in a rush and honestly, I didn't try very hard to make the parts I fabbed pretty, just functional.

I'll need to make some diagrams illustrating how to fabricate the internal parts.

You'll need some basic tools like a dremel with cutting wheels, maybe a hack saw and a bench/tech vice of some kind.

Please do. A DIY and parts list would be really helpful.

Send me the list dude. I'm also looking at a catch can setup that NeverBoneStck did on his G37 with go kart catch cans but good to have plenty of DIY options :tup: but yes, you definitely should do a DIY on this cause this is a very nice setup. Much cleaner then most out there.

http://www.the370z.com/diy-section-d...ors-cheap.html

Boom.

Ill take your word then.

Sub'd to read later,

What does it do for your Z?

A catch can? The same thing it does for any vehicle. It collects the vapor that the pcv system and crank vent feeds back ito the intake tract. This way you're not adding oily vapor to the clean fresh air your motor is trying to burn.

Alrighty. Not trying to be a jerk or anything, honest!