Catch can.. Vented or Sealed
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,514
Likes: 5
Catch can.. Vented or Sealed
Both of my cars are cammed. My C6Z will be vented aince itll be boosted. My camaro on the other hand is 100% NA, and is daily driven. Theres no catch can on there now since I just got the car cammed. Will doing a vented setup throw a cel/ car will run like **** since there will be a vac leak, or just get a sealed unit?
Drifting
Joined: Mar 2003
Posts: 1,771
Likes: 141
From: Kaukauna WI
I got a vented can from Mighty Mouse. But it's not always venting to the open air. You'd have to talk to the experts at MM, but it only "vents" when there is too much pressure in the can. It's like a check valve I think (or a blow off valve). So, by design, it should never really vent unless something is wrong or there is just way too much pressure in the system.
Drifting
Joined: Mar 2011
Posts: 1,448
Likes: 56
From: Bath NC
You want to vent the crank case not the vacuum side of the engine. If you vent the catch can, vent it thru a top breather or route back to intake side. The small amount of vacuum on the intake side thru a small hose is enough to help pull a very small amount from the crank case when its not under pressure. When its under pressure it'll do its own venting, whether thro a small breather or back to the intake. Back to the intake is legal.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
No reason to run a vented on either setup. MM cans are not vented unless you order them specifically that way. They do have a 1 way safety valve in case system over pressures then it releases to atmosphere, but that isn't a "vented" can.
Basically call/email dave and he can set you up with whatever you need.
Basically call/email dave and he can set you up with whatever you need.
Burning Brakes
Joined: Mar 2012
Posts: 836
Likes: 43
From: Killeen Texas
Baffled...
I added a catch can to my set up (2013 MN6 Grand Sport) -Here is the thread - https://www.corvetteforum.com/forums...h-can-pic.html
It was a work in progress for a hot minute. The photos at beginning of the thread, I had the plumbing wrong. It took awhile, but I got the bugs worked out. It came together after some great feedback from forum members. By post #27 or so I had the bugs worked out.
I added a catch can to my set up (2013 MN6 Grand Sport) -Here is the thread - https://www.corvetteforum.com/forums...h-can-pic.htmlIt was a work in progress for a hot minute. The photos at beginning of the thread, I had the plumbing wrong. It took awhile, but I got the bugs worked out. It came together after some great feedback from forum members. By post #27 or so I had the bugs worked out.
Both of my cars are cammed. My C6Z will be vented aince itll be boosted. My camaro on the other hand is 100% NA, and is daily driven. Theres no catch can on there now since I just got the car cammed. Will doing a vented setup throw a cel/ car will run like **** since there will be a vac leak, or just get a sealed unit?
Last edited by dmoneychris; Feb 27, 2017 at 11:00 PM.
Thread Starter
Drifting
Joined: Sep 2013
Posts: 1,514
Likes: 5
Baffled... I added a catch can to my set up (2013 MN6 Grand Sport) -Here is the thread - https://www.corvetteforum.com/forums...h-can-pic.html
It was a work in progress for a hot minute. The photos at beginning of the thread, I had the plumbing wrong. It took awhile, but I got the bugs worked out. It came together after some great feedback from forum members. By post #27 or so I had the bugs worked out.
I added a catch can to my set up (2013 MN6 Grand Sport) -Here is the thread - https://www.corvetteforum.com/forums...h-can-pic.htmlIt was a work in progress for a hot minute. The photos at beginning of the thread, I had the plumbing wrong. It took awhile, but I got the bugs worked out. It came together after some great feedback from forum members. By post #27 or so I had the bugs worked out.
Burning Brakes
Joined: Mar 2012
Posts: 836
Likes: 43
From: Killeen Texas
I see now. I miss read the question. This one I have is sealed. I would think that a vented Catch Can would leave a fine mist of oil on the entire engine bay. No-Go in my book.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
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
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Depends on if it check valve correctly.
With either, you want the intake side to put a vacuum on the valley cover side at less than WOT, to keep the oil cleaner a lot longer.
With a blower, since you will have higher than normal blow by at the pistons during WOT that is pressurizing the oil pan area way more than a N/A motor, here is where you want the extra pressure to be vented to the atmosphere via a check valve system , instead of being pushed back into the motor isntead.
With either, you want the intake side to put a vacuum on the valley cover side at less than WOT, to keep the oil cleaner a lot longer.
With a blower, since you will have higher than normal blow by at the pistons during WOT that is pressurizing the oil pan area way more than a N/A motor, here is where you want the extra pressure to be vented to the atmosphere via a check valve system , instead of being pushed back into the motor isntead.
Le Mans Master
Joined: May 2016
Posts: 7,043
Likes: 1,546
From: Florida
Depends on if it check valve correctly.
With either, you want the intake side to put a vacuum on the valley cover side at less than WOT, to keep the oil cleaner a lot longer.
With a blower, since you will have higher than normal blow by at the pistons during WOT that is pressurizing the oil pan area way more than a N/A motor, here is where you want the extra pressure to be vented to the atmosphere via a check valve system , instead of being pushed back into the motor isntead.
With either, you want the intake side to put a vacuum on the valley cover side at less than WOT, to keep the oil cleaner a lot longer.
With a blower, since you will have higher than normal blow by at the pistons during WOT that is pressurizing the oil pan area way more than a N/A motor, here is where you want the extra pressure to be vented to the atmosphere via a check valve system , instead of being pushed back into the motor isntead.
With a catch can on an FI, the intake manifold line gets checked back to the can, the crankcase gets a straight vent back to the can via a valve covered vent, and the crankcase vent back to the CAI with no check.
If you have no catch can on an FI then you're left with only the PCV U tube venting the crankcase into the intake. On an FI this needs to be checked, but you're checking the intake from reversing vacuum to pressure back into the crankcase. In this case, it is necessary to have a secondary CC vent (usually through the valve cover) BC at boost you have the worst of both worlds with CC pressure building and boost being checked at the PCV.
Last edited by BlindSpot; Mar 1, 2017 at 08:17 AM.
Supporting Vendor
Joined: Aug 2013
Posts: 1,369
Likes: 294
From: Virginia
your comments are exactly why I do what i do.
best of both worlds! closed when you want it, open when you need it
I can build a single can complete pcv system for a c6z up to 1500hp.
here is a video example, some other fun videos on my channel as well
best of both worlds! closed when you want it, open when you need it
I can build a single can complete pcv system for a c6z up to 1500hp.
here is a video example, some other fun videos on my channel as well
__________________
Solutions for the common gearhead #made in USA
mightymousesolutions.com
facebok.com/mightymousesolutions
#mmsolutions
Six time NMCA True Street Champions
Home of the first Twin Turbo C7Z 7.81 @ 176
3470# Stock bottom end and heads Corvette Stock Bottom End Record Holder
Solutions for the common gearhead #made in USA
mightymousesolutions.com
facebok.com/mightymousesolutions
#mmsolutions
Six time NMCA True Street Champions
Home of the first Twin Turbo C7Z 7.81 @ 176
3470# Stock bottom end and heads Corvette Stock Bottom End Record Holder