regular vs breather catch can???
Thread Starter
Le Mans Master
Joined: Sep 2002
Posts: 6,569
Likes: 2,401
From: Redacted
regular vs breather catch can???
Im about to order a PCV catch can from forum vendor CCA, any opinions on the regular vs the vented can with the breather on top that eliminates the line running to the intake?? Ideally Id like to run the one with the breather and eliminate that line but wanted to know if there is any downside to doing that.
Thanks
Thanks
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
That doesn't appear to me to fit the bill as a PCV setup, i.e., positive crankcase ventilation. You are now relying on internal blowby pressure buildup to vent the crankcase at all RPM. I would think cold start condensation purge wouldn't be as effective either.
If it were my car, I would go with the non-vented and keep the connection to the intake.
If it were my car, I would go with the non-vented and keep the connection to the intake.
Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
That doesn't appear to me to fit the bill as a PCV setup, i.e., positive crankcase ventilation. You are now relying on internal blowby pressure buildup to vent the crankcase at all RPM. I would think cold start condensation purge wouldn't be as effective either.
If it were my car, I would go with the non-vented and keep the connection to the intake.
If it were my car, I would go with the non-vented and keep the connection to the intake.
I'm running a conventional non-breather catch can from the valley to the PCV/Intake behind the throttle body
AND
A breather catch can off the passenger side valve cover, thereby deleting the tube to the front of the intake ahead of the throttle body.
This is on a track car and it seems to be working fine. Am I missing something (or will I be), just looking for your take on this set up.
Thanks
Doug - Last C5
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
That doesn't appear to me to fit the bill as a PCV setup, i.e., positive crankcase ventilation. You are now relying on internal blowby pressure buildup to vent the crankcase at all RPM. I would think cold start condensation purge wouldn't be as effective either.
If it were my car, I would go with the non-vented and keep the connection to the intake.
If it were my car, I would go with the non-vented and keep the connection to the intake.
... i wouldn't run one with a breather either... the pcv also helps remove condensation as stated above and with this removed will cause sludge to build up faster than normal... i guess it may not be a problem if you change your oil like you do underwear but who really does that??
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
That doesn't appear to me to fit the bill as a PCV setup, i.e., positive crankcase ventilation. You are now relying on internal blowby pressure buildup to vent the crankcase at all RPM. I would think cold start condensation purge wouldn't be as effective either.
If it were my car, I would go with the non-vented and keep the connection to the intake.
If it were my car, I would go with the non-vented and keep the connection to the intake.
use that intake vacuum to help out the pcv system. it doesn't make sense to remove something that gives the system an advantage. that's why they designed it the way they did.
Safety Car
Joined: May 2007
Posts: 4,812
Likes: 46
From: Taylorsville North Carolina
Vettenuts,
I'm running a conventional non-breather catch can from the valley to the PCV/Intake behind the throttle body
AND
A breather catch can off the passenger side valve cover, thereby deleting the tube to the front of the intake ahead of the throttle body.
This is on a track car and it seems to be working fine. Am I missing something (or will I be), just looking for your take on this set up.
Thanks
Doug - Last C5
I'm running a conventional non-breather catch can from the valley to the PCV/Intake behind the throttle body
AND
A breather catch can off the passenger side valve cover, thereby deleting the tube to the front of the intake ahead of the throttle body.
This is on a track car and it seems to be working fine. Am I missing something (or will I be), just looking for your take on this set up.
Thanks
Doug - Last C5
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
