Crankcase /PCV System / Boosted application. Ls3
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Teching In
Joined: Sep 2012
Posts: 21
Likes: 3
Crankcase /PCV System / Boosted application. Ls3 Hello all. Not sure why this is so difficult to get a handle on or find a solution. I have an ls3. My valley cover is not ported. My driverside valve cover does not have thr removable pcv valve. I have one port in the front of my passenger side valve cover. I have the stock dbw throttle body. My ls3 intake has 1 passenger intake port and the driver side as a port. I am running a vortech centrifugal supercharger. I am trying to find a pcv soluyion with catchcan. I purchased a catch can but i have not unstalled it yet because I cannot fund a clear way to install them on boosted applications. Either they have a valley cover which a port that I dont have or they are using check valaves in places ...or they are using ports on their throttle bodies whichbI have a gen iv dbw so it does not have that. Some also have a port in the intake after the maf but before the TB. Do i need check valves or an inline pcv?
Can someone provide me with the best way to plumb this for an:
-Ls3
-No Port coming from valley pan
-Gen4 Throttle body
-Vortech Supercharge up to 10lbs boost
-Catch can has 2 ins and 1 out (dont have to use both ins) it also has a breather on top if I want to use.
Can someone provide me with the best way to plumb this for an:
-Ls3
-No Port coming from valley pan
-Gen4 Throttle body
-Vortech Supercharge up to 10lbs boost
-Catch can has 2 ins and 1 out (dont have to use both ins) it also has a breather on top if I want to use.
Last edited by Red944ls1; Apr 15, 2023 at 08:30 PM.
Staging Lane
Joined: Aug 2022
Posts: 92
Likes: 8
Hello all. Not sure why this is so difficult to get a handle on or find a solution. I have an ls3. My valley cover is not ported. My driverside valve cover does not have thr removable pcv valve. I have one port in the front of my passenger side valve cover. I have the stock dbw throttle body. My ls3 intake has 1 passenger intake port and the driver side as a port. I am running a vortech centrifugal supercharger. I am trying to find a pcv soluyion with catchcan. I purchased a catch can but i have not unstalled it yet because I cannot fund a clear way to install them on boosted applications. Either they have a valley cover which a port that I dont have or they are using check valaves in places ...or they are using ports on their throttle bodies whichbI have a gen iv dbw so it does not have that. Some also have a port in the intake after the maf but before the TB. Do i need check valves or an inline pcv?
Can someone provide me with the best way to plumb this for an:
-Ls3
-No Port coming from valley pan
-Gen4 Throttle body
-Vortech Supercharge up to 10lbs boost
-Catch can has 2 ins and 1 out (dont have to use both ins) it also has a breather on top if I want to use.
Can someone provide me with the best way to plumb this for an:
-Ls3
-No Port coming from valley pan
-Gen4 Throttle body
-Vortech Supercharge up to 10lbs boost
-Catch can has 2 ins and 1 out (dont have to use both ins) it also has a breather on top if I want to use.
Lool at Mighty Mouse catch can. That's what I had for my old ls3. Still have that on my built 402, after my ls3 took a dump. Also have a centri blower too.
I'm running flipped LS1 covers with -10AN bungs welded into them. I think you can also find aftermarket valve covers with the bungs already welded in.
Also you want to generally avoid locating the bung in the back near the firewall, the lines will ingest more oil than is ideal when you are accelerating (oil slops back).
If you look at the location of the bungs on very fast LS race cars they are usually up high on the valve cover located in the middle or in the front.
Also you want to generally avoid locating the bung in the back near the firewall, the lines will ingest more oil than is ideal when you are accelerating (oil slops back).
If you look at the location of the bungs on very fast LS race cars they are usually up high on the valve cover located in the middle or in the front.
TECH Enthusiast
Joined: Nov 2017
Posts: 661
Likes: 91
From: S.F. East bay
you wouldnt happen to have a pic would ya…i have a breather on the driver side rear port and capped passenger valve cover ports…id put a breather on my oil fill but my vortech v-3sci is already claiming that real estate…i bought a $50 breather cap for nothing…i was thinking of swapping sides for the valve covers
Running a 3/8 line from the rear driver's valve cover (built in tiny orifice) to the intake manifold with a check valve to prevent boost from pressurizing crankcase. Driver's valve cover nipple capped. I have a large -10AN oil filler adapter running a -10AN hose in front of the turbo impeller. No catch can.
Under vacuum it pulls fresh air in through the filler cap vent and through the crankcase, picking up crankcase gases and making its way to the intake manifold and being burned.
Under boost the check valve closes, and any blowby (excessive crankcase pressure/oil fumes) comes out the -10 vent and is sucked into the turbo to be burned. I have zero smells and the end of the -10AN hose is bone dry (no liquid oil being ingested into turbo). The filler cap adapter fitting is a fairly tall 90 and the hose runs slightly uphill to prevent any oil splashing out. If I had room for a filter on the turbo I'd connect that hose to the filter for a cleaner look.
Last edited by LQ4-E39; Apr 18, 2023 at 03:06 PM.
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Launching!
Joined: Jul 2008
Posts: 205
Likes: 10
From: Newville, PA
I see your poor mans setup and raise
Running a 3/8 line from the rear driver's valve cover (built in tiny orifice) to the intake manifold with a check valve to prevent boost from pressurizing crankcase. Driver's valve cover nipple capped. I have a large -10AN oil filler adapter running a -10AN hose in front of the turbo impeller. No catch can.
Under vacuum it pulls fresh air in through the filler cap vent and through the crankcase, picking up crankcase gases and making its way to the intake manifold and being burned.
Under boost the check valve closes, and any blowby (excessive crankcase pressure/oil fumes) comes out the -10 vent and is sucked into the turbo to be burned. I have zero smells and the end of the -10AN hose is bone dry (no liquid oil being ingested into turbo). The filler cap adapter fitting is a fairly tall 90 and the hose runs slightly uphill to prevent any oil splashing out. If I had room for a filter on the turbo I'd connect that hose to the filter for a cleaner look.
Running a 3/8 line from the rear driver's valve cover (built in tiny orifice) to the intake manifold with a check valve to prevent boost from pressurizing crankcase. Driver's valve cover nipple capped. I have a large -10AN oil filler adapter running a -10AN hose in front of the turbo impeller. No catch can.
Under vacuum it pulls fresh air in through the filler cap vent and through the crankcase, picking up crankcase gases and making its way to the intake manifold and being burned.
Under boost the check valve closes, and any blowby (excessive crankcase pressure/oil fumes) comes out the -10 vent and is sucked into the turbo to be burned. I have zero smells and the end of the -10AN hose is bone dry (no liquid oil being ingested into turbo). The filler cap adapter fitting is a fairly tall 90 and the hose runs slightly uphill to prevent any oil splashing out. If I had room for a filter on the turbo I'd connect that hose to the filter for a cleaner look.
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Verdad Gallardo A check valve there would prevent fresh air from coming into the crankcase, so how else are you supposed to pull in make up air to replace the dirty air being sucked out of the crankcase? The factory orifice at the driver's rear valve cover port is very small, so the volume of air being pulled through should be minor.
Launching!
Joined: Jul 2008
Posts: 205
Likes: 10
From: Newville, PA
A check valve there would prevent fresh air from coming into the crankcase, so how else are you supposed to pull in make up air to replace the dirty air being sucked out of the crankcase? The factory orifice at the driver's rear valve cover port is very small, so the volume of air being pulled through should be minor.
I'm not sure why anyone would want fresh air entering their crankcase. Especially, unfiltered and unmetered air. I don't think you'll find too many folks here that advocate for giant vacuum leaks behind the throttle body to facilitate whatever it is you're trying to accomplish. Must idle like a champ.
You've got me on the unfiltered part, but it's hardly the first time someone has run no filter on a turbo LS.
But "giant" vacuum leak? The intake manifold is trying to suck through a 1/16" hole in the valve cover baffle...it idles fine. There is no MAF.
The reason the filler vent is so big is to vent blowby. My setup is very similar to forcd ind's except he's running a container. Both have open breathers on the filler and a vacuum source from the intake. Again, how else do you suggest bringing makeup air into the crankcase if you're removing it on the dirty side?
TECH Enthusiast
Joined: Feb 2020
Posts: 734
Likes: 209
any pvc system is a controlled and metered vacuum leak , old school pcv valve ( preferred IMO) or metered orifice using manifold vacuum to draw fumes, vapors , blowby out of the crankcase and allowing fresh (usually filtered air ) into the crankcase - usually in cross flow arrangement VC to VC on opposite corners or a V engine .