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09-20-2008
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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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 |
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09-20-2008
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#2 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: Catch Can hookup
how much oil you using?
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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 |
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09-20-2008
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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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 |
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09-20-2008
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#4 |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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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.
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
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09-20-2008
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#5 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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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 |
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09-20-2008
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#6 |
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Guest
Posts: n/a
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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. |
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09-20-2008
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#7 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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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. 
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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. |
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09-20-2008
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Catch Can hookup
The air horn is dry but I still have puddling in the TB.
LGAFF 92 ZR1 #234 |
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09-20-2008
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#9 |
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
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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
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09-20-2008
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#10 | |
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Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: Catch Can hookup
Quote:
There's only 2 routes for engine oil to possibly get there & both have been addressed here, from the cam cover vent tubes (highly unlikely) & the PCV vacuum source which is the highly probable culprit. It enters the plenum right behind the TB.
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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. |
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