Who's running a catch can?

Ron · 12-30-2011, 09:54 AM

Quote:

The factory setup is that, separately on each side of the engine, one hose flows outwards from the crankcase to a manifold vacuum inlet,

So these are the ones toward the front of the engine that connect to the two V shaped nipples on the front of the manifold. They flow OUT from the crankcase to the manifold?

Quote:

and the the other hose flows inwards from filtered intake air into the crankcase. At least the vacuum-connected ones have PCV valves on them, I'm not sure whether the fresh-air-connected ones have a valve buried in there somewhere (or perhaps just some foam or something).

So these are the ones that connect from the intake tubing through a plastic baffle and then into the valve cover? Where/when is the air recirculated back to intake then?

Quote:

So to run a dual-can setup, the normal way would be to splice one can into each of the vacuum<-crankcase lines.

So splice a can in between each of the red hoses pictured here:

I'm confused now

lol

wstar · 12-30-2011, 05:14 PM

Quote:

Originally Posted by Ron

So these are the ones toward the front of the engine that connect to the two V shaped nipples on the front of the manifold. They flow OUT from the crankcase to the manifold?

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

Quote:

So these are the ones that connect from the intake tubing through a plastic baffle and then into the valve cover?

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

Quote:

Where/when is the air recirculated back to intake then?

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.

Quote:

So splice a can in between each of the red hoses pictured here:

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.

synolimit · 06-12-2013, 12:54 PM

Quote:

Originally Posted by wstar

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

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.

Sh0velMan · 06-12-2013, 01:16 PM

Quote:

Originally Posted by synolimit

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)

chrischhorn · 06-12-2013, 01:23 PM

Quote:

Originally Posted by Sh0velMan

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)

Nice job! That looks awesome!

synolimit · 06-13-2013, 02:22 AM

Ill take your word then.

roplusbee · 12-30-2011, 03:08 PM

Ron:

You are going to have to share notes with me when I get back. Let me know how those catch cans work out for you and how much they fill over say a month. I never had one in any of my other turbo'd cars, but I didn't have crap in my intake either. I did have a variety of other issues, that were heat related though.

Ron · 12-30-2011, 03:12 PM

I sure will.. If I can figure out how to hook them up lol, everybody seems to install them differently, JBs right there has a PCV port blocked. I saw a TT car at baker that had the vacuum inlets (Vshaped) on the manifold blocked too.

Jordo! · 12-30-2011, 03:12 PM

Note: You want one that is baffled and/or filtered to actually trap the oil and not just recirculate it...

You also want steel braided hose lines so they don't collapse under vacuum.

Probably not a big deal on a N/A car, BTW.

Ron · 12-30-2011, 03:15 PM

yep I took that into consideration, I am looking into these:

42 Draft Designs

or

Radium Engineering
Universal Dual Catch Can Kit

Jordo right here is pretty knowledgeable

... how are we supposed to connect them?

O&G · 12-30-2011, 03:23 PM

Quote:

Originally Posted by Ron

yep I took that into consideration, I am looking into these:

42 Draft Designs

or

Radium Engineering
Universal Dual Catch Can Kit

Jordo right here is pretty knowledgeable

... how are we supposed to connect them?

PCV line, your red hoses! I'm interested to see how much you collect too. Had one on my TT 350, didn't collect much at all. Get that 42design can, looks like a great design with the screens and all.

Jordo! · 12-30-2011, 03:22 PM

^^^ Now of that I'm not sure off the top of my head.

I think previous page someone posted a diagram...

Those cans are really nice! Especially the ones at second link.

Ron · 12-30-2011, 03:23 PM

Quote:

Originally Posted by Jordo!

^^^ Now of that I'm not sure off the top of my head.

I think previous page someone posted a diagram...

Those cans are really nice! Especially the ones at second link.

I posted that diagram but it turns out it seems to be wrong lollol.. Yep that is the one I am leaning towards.

O&G · 12-30-2011, 03:26 PM

Both cans look good, read the other one as well!

Ron · 12-30-2011, 05:58 PM

I get it now, thanks wstar! Repped.

06-13-2013, 02:22 AM	#6 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3389	Ill take your word then. __________________ 13 370z- Last edited by synolimit; 06-13-2013 at 02:49 AM.

12-30-2011, 03:08 PM	#7 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 23	Ron: You are going to have to share notes with me when I get back. Let me know how those catch cans work out for you and how much they fill over say a month. I never had one in any of my other turbo'd cars, but I didn't have crap in my intake either. I did have a variety of other issues, that were heat related though. __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

12-30-2011, 03:12 PM	#8 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	I sure will.. If I can figure out how to hook them up lol, everybody seems to install them differently, JBs right there has a PCV port blocked. I saw a TT car at baker that had the vacuum inlets (Vshaped) on the manifold blocked too. __________________ 2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread [ GTM GTX Stg2 TT \|\| HKS EVC6 \|\| Custom CarPC \|\| F.I 3'' TDX CBE \|\| SB 6puck clutch/ZSpeed CSC \|\| BC BR Coilovers \|\| SPC camber arms \|\| Work VSS-X \|\| Custom Headlights \|\| PW:JDM CF Covers \|\| Seibon CF Engine Cover ]

12-30-2011, 03:12 PM	#9 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Note: You want one that is baffled and/or filtered to actually trap the oil and not just recirculate it... You also want steel braided hose lines so they don't collapse under vacuum. Probably not a big deal on a N/A car, BTW. __________________ Enjoy it. Destroy it.

12-30-2011, 03:15 PM	#10 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	yep I took that into consideration, I am looking into these: 42 Draft Designs or Radium Engineering Universal Dual Catch Can Kit Jordo right here is pretty knowledgeable ... how are we supposed to connect them? GaleForce likes this. __________________ 2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread [ GTM GTX Stg2 TT \|\| HKS EVC6 \|\| Custom CarPC \|\| F.I 3'' TDX CBE \|\| SB 6puck clutch/ZSpeed CSC \|\| BC BR Coilovers \|\| SPC camber arms \|\| Work VSS-X \|\| Custom Headlights \|\| PW:JDM CF Covers \|\| Seibon CF Engine Cover ] Last edited by Ron; 12-30-2011 at 03:18 PM.

12-30-2011, 03:22 PM	#12 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	^^^ Now of that I'm not sure off the top of my head. I think previous page someone posted a diagram... Those cans are really nice! Especially the ones at second link. __________________ Enjoy it. Destroy it.

12-30-2011, 03:26 PM	#14 (permalink)
O&G A True Z Fanatic Join Date: Nov 2010 Location: Lone Star State Age: 42 Posts: 1,212 Drives: 40th Anv. Rep Power: 23	Both cans look good, read the other one as well! __________________ O&G's Build/Journal <---(1st lowmount single turbo treeseventy) Built Engine Thread 2011 F-250 Build/Journal

12-30-2011, 05:58 PM	#15 (permalink)
Ron A True Z Fanatic Join Date: Oct 2010 Location: Houston, TX Posts: 3,009 Drives: TT '11 PW Nismo #113 Rep Power: 22	I get it now, thanks wstar! Repped. __________________ 2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread [ GTM GTX Stg2 TT \|\| HKS EVC6 \|\| Custom CarPC \|\| F.I 3'' TDX CBE \|\| SB 6puck clutch/ZSpeed CSC \|\| BC BR Coilovers \|\| SPC camber arms \|\| Work VSS-X \|\| Custom Headlights \|\| PW:JDM CF Covers \|\| Seibon CF Engine Cover ]

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