Catch Can hookup - ZR-1 Net Registry Forums

LGAFF · 09-20-2008

I have my catch can hooked up off the PCV system, wondering if I should have them hooked up off the breathers coming from the heads into the air horn?

LGAFF
92 ZR1
#234

-=Jeff=- · 09-20-2008

how much oil you using?

LGAFF · 09-20-2008

I have not measured it but seems like alot......I pulled the plenum to fix a vac leak and it was still coated in oil, even though there was oil in the catch can.

Wondering if the vapor is hitting the TB blades and condensing back into liquid???????????

LGAFF
92 ZR1
#234

Aurora40 · 09-20-2008

I think the one in front of the TB, i.e. open to ambient pressure, is what allows air into the system. Presumably air shouldn't flow back to the air horn, though I think I've noticed oil in the air horn in the past as well.

LGAFF · 09-20-2008

Haibeck said that oil comes back up through the engine, maybe this was what he was referencing?

LGAFF
92 ZR1
#234

09-20-2008

The pipes going into the cam cover are a fresh air intake. Under extreme circumstances should you actually have oil flowing from the cam cover to the air horn. If you did have that issue, the last worry would be oil in the plenum.

You could fab a system up to cap of the air horn inlets, and then use a another catch can with a open element breather on the top.

The PCV system is the main culprit, as it is a direct tie in with the plenum.

A26B · 09-20-2008

Bob is correct. The tubes from each cam cover to the air horn is for the filtered purge air to the crankcase.

I believe the catch can should be installed into the line between the PCV's & the plenum. That's where oil in the plenum comes from, sucked up through the PCV's vi the PCV system vacuum source. Here's a drawing I made to show how we are going to do it on the Raptor TT system.

LGAFF · 09-20-2008

The air horn is dry but I still have puddling in the TB.

LGAFF
92 ZR1
#234

Aurora40 · 09-20-2008

The TB is where the PCV comes in. Maybe your catch can isn't catching all of it?

jonszr1 · 09-20-2008

you might want to get in contact with corey and ask him what they did to bob halls car to solve this problem

09-20-2008	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Catch Can hookup I have my catch can hooked up off the PCV system, wondering if I should have them hooked up off the breathers coming from the heads into the air horn? LGAFF 92 ZR1 #234

09-20-2008	#3
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Catch Can hookup I have not measured it but seems like alot......I pulled the plenum to fix a vac leak and it was still coated in oil, even though there was oil in the catch can. Wondering if the vapor is hitting the TB blades and condensing back into liquid??????????? LGAFF 92 ZR1 #234

09-20-2008	#4
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Catch Can hookup I think the one in front of the TB, i.e. open to ambient pressure, is what allows air into the system. Presumably air shouldn't flow back to the air horn, though I think I've noticed oil in the air horn in the past as well. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

09-20-2008	#5
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Catch Can hookup Haibeck said that oil comes back up through the engine, maybe this was what he was referencing? LGAFF 92 ZR1 #234

09-20-2008	#6
Jeffvette Guest Posts: n/a	Re: Catch Can hookup The pipes going into the cam cover are a fresh air intake. Under extreme circumstances should you actually have oil flowing from the cam cover to the air horn. If you did have that issue, the last worry would be oil in the plenum. You could fab a system up to cap of the air horn inlets, and then use a another catch can with a open element breather on the top. The PCV system is the main culprit, as it is a direct tie in with the plenum.

09-20-2008	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Re: Catch Can hookup how much oil you using? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

09-20-2008	#7
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: Catch Can hookup Bob is correct. The tubes from each cam cover to the air horn is for the filtered purge air to the crankcase. I believe the catch can should be installed into the line between the PCV's & the plenum. That's where oil in the plenum comes from, sucked up through the PCV's vi the PCV system vacuum source. Here's a drawing I made to show how we are going to do it on the Raptor TT system. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 09-20-2008 at 06:53 PM.*

09-20-2008	#8
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Catch Can hookup The air horn is dry but I still have puddling in the TB. LGAFF 92 ZR1 #234

09-20-2008	#9
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Catch Can hookup The TB is where the PCV comes in. Maybe your catch can isn't catching all of it? __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

09-20-2008	#10
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Catch Can hookup you might want to get in contact with corey and ask him what they did to bob halls car to solve this problem