My catch can routing ok?
09-07-2017, 11:57 AM
#661
If you run an MAF and you want crankcase vacuum, you must have a *closed loop* system. You can't use the breathers. This is the most important to remember.
Now, if you do not want crankcase vacuum, you could use a catch can and the breathers. But then it's almost pointless to have a can. You could... a friend of mine has all the ports capped off and uses a can (on his z06 valley cover tube) to catch some of the blow by gas. But it certainly doesn't catch the kind of oil a pressurized system can.
Now, if you do not want crankcase vacuum, you could use a catch can and the breathers. But then it's almost pointless to have a can. You could... a friend of mine has all the ports capped off and uses a can (on his z06 valley cover tube) to catch some of the blow by gas. But it certainly doesn't catch the kind of oil a pressurized system can.
09-07-2017, 01:00 PM
#663
If you run an MAF and you want crankcase vacuum, you must have a *closed loop* system. You can't use the breathers. This is the most important to remember.
Now, if you do not want crankcase vacuum, you could use a catch can and the breathers. But then it's almost pointless to have a can. You could... a friend of mine has all the ports capped off and uses a can (on his z06 valley cover tube) to catch some of the blow by gas. But it certainly doesn't catch the kind of oil a pressurized system can.
Now, if you do not want crankcase vacuum, you could use a catch can and the breathers. But then it's almost pointless to have a can. You could... a friend of mine has all the ports capped off and uses a can (on his z06 valley cover tube) to catch some of the blow by gas. But it certainly doesn't catch the kind of oil a pressurized system can.
1. Hose from Silver TB port to 1 of the driver side VC ports.
2. Hose from other Driver Side VC port to Passenger VC port.
3. Hose from LS6 Valley cover to non vented Catch Can
4. Hose from Catch Can to Port on intake
5. Ditch the breather as oil fill and get regular oil cap
and that should have me maintain PCV but not building up to much Crank case pressure?
EDIT:
Would simply running a hose from TB to Passenger VC and capping the driver side port as well as the second passenger side port yeild the same results as just running a hose between the DS port and 2nd PS port? Or would the lack of air traveling between both VCs cause an issue?
Last edited by micbegz28; 09-07-2017 at 01:07 PM.
09-26-2017, 11:47 AM
#664
I found this company, but can't get anyone to respond to my questions on details. The owner has an answering service..... but, still doesn't help.....
Looks like a nice system, tho....
https://www.rxspeedworks.com/
Looks like a nice system, tho....
https://www.rxspeedworks.com/
09-26-2017, 11:59 AM
#666
So a Closed Loop System would be
1. Hose from Silver TB port to 1 of the driver side VC ports.
2. Hose from other Driver Side VC port to Passenger VC port.
3. Hose from LS6 Valley cover to non vented Catch Can
4. Hose from Catch Can to Port on intake
5. Ditch the breather as oil fill and get regular oil cap
and that should have me maintain PCV but not building up to much Crank case pressure?
EDIT:
Would simply running a hose from TB to Passenger VC and capping the driver side port as well as the second passenger side port yeild the same results as just running a hose between the DS port and 2nd PS port? Or would the lack of air traveling between both VCs cause an issue?
1. Hose from Silver TB port to 1 of the driver side VC ports.
2. Hose from other Driver Side VC port to Passenger VC port.
3. Hose from LS6 Valley cover to non vented Catch Can
4. Hose from Catch Can to Port on intake
5. Ditch the breather as oil fill and get regular oil cap
and that should have me maintain PCV but not building up to much Crank case pressure?
EDIT:
Would simply running a hose from TB to Passenger VC and capping the driver side port as well as the second passenger side port yeild the same results as just running a hose between the DS port and 2nd PS port? Or would the lack of air traveling between both VCs cause an issue?
FWIW, my stock LS6 system has the driver side valve cover ports capped. The port coming from the throttle body is the "clean" side that pulls in fresh metered air from the inlet tube and brings it through the valve cover and then is drawn out through the valey cover port. Leaving both sides of the valve covers connected shouldn't have any ill effects, though.
09-28-2017, 10:10 AM
#667
Mighty Mouse;
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
09-28-2017, 11:00 AM
#668
Mighty Mouse;
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
09-28-2017, 11:08 AM
#669
A vacuum leak, doesn't the passenger side vent tube (on the valve cover) go to the filtered side (down stream) of the air cleaner on a regular truck TB? Mine did.
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
Chad
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
Chad
Last edited by ss4chad; 09-28-2017 at 11:56 AM.
09-28-2017, 02:42 PM
#670
TECH Senior Member
Mighty Mouse;
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
A vacuum leak, doesn't the passenger side vent tube (on the valve cover) go to the filtered side (down stream) of the air cleaner on a regular truck TB? Mine did.
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
Chad
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
Chad
Where is your fresh air inlet...?
09-28-2017, 03:06 PM
#671
Answers in bold.
This thread has further diagrams of how PCVs are routed:
https://ls1tech.com/forums/generatio...fo-needed.html
A vacuum leak, doesn't the passenger side vent tube (on the valve cover) go to the filtered side (down stream) of the air cleaner on a regular truck TB? Mine did.
The fresh air inlet for the PCV system draws air from any point between the MAF sensor and the throttle body. Often, the throttle body has a provision for this hose--I'm not sure if your truck's is like that, though. If you have breathers on your valve covers, you are likely drawing air through those because the connection at the intake manifold is drawing air from any open source within the crank case/valve covers. Those breathers open the loop that was otherwise made between the routing I first described.
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
Yes. Rather than a valve, the LS6 valley cover has a baffled orifice (aka hole). The baffling is supposed to suppress the oil splashing directly up through the hole. They're still known to suck oil, though--hence the catch can. The dirty side catch can should be routed to the port in the intake just behind the throttle body.
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Do you have an LS6 valley cover or a driver's side PCV valve? It's usually one or the other unless you've mixed and matched parts.
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
If you have two forms of PCV, then yes, that would be simplest.
If you've built an engine with an amount of boost that makes the PCV system impractical (blowing off vacuum lines) and you'd like to avoid pressurizing the crank case, then you can eliminate the PCV system for simplicity's sake and run valve cover vents (draft vents). If you have a problem with those vents taking on oil, you can route lines to a draft can--simple lines from each valve cover to a can with a filter vent on top. You would then cap the lines on the intake to eliminate the PCV function. This is not emissions compliant, BTW.
Some would suggest a vacuum pump to put the crank case in vacuum, but those are typically only seen in race engines.
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
The vacuum leak may be minor, but it's probably causing a lean condition that you haven't noticed.
Chad
The fresh air inlet for the PCV system draws air from any point between the MAF sensor and the throttle body. Often, the throttle body has a provision for this hose--I'm not sure if your truck's is like that, though. If you have breathers on your valve covers, you are likely drawing air through those because the connection at the intake manifold is drawing air from any open source within the crank case/valve covers. Those breathers open the loop that was otherwise made between the routing I first described.
Doesn't the LS6 valley cover vent tube essentially take the place of the PCV and it gets ran to the catch can?
Yes. Rather than a valve, the LS6 valley cover has a baffled orifice (aka hole). The baffling is supposed to suppress the oil splashing directly up through the hole. They're still known to suck oil, though--hence the catch can. The dirty side catch can should be routed to the port in the intake just behind the throttle body.
The PCV line on the driver side valve cover was routed (prior to the new intake) per Mike Norris instructions, to the top of the catch can, as it is now with the new intake..
Do you have an LS6 valley cover or a driver's side PCV valve? It's usually one or the other unless you've mixed and matched parts.
Should I just cap off the passenger and drivers side vent line's and just use the LS6 valley cover vent line?
If you have two forms of PCV, then yes, that would be simplest.
If you've built an engine with an amount of boost that makes the PCV system impractical (blowing off vacuum lines) and you'd like to avoid pressurizing the crank case, then you can eliminate the PCV system for simplicity's sake and run valve cover vents (draft vents). If you have a problem with those vents taking on oil, you can route lines to a draft can--simple lines from each valve cover to a can with a filter vent on top. You would then cap the lines on the intake to eliminate the PCV function. This is not emissions compliant, BTW.
Some would suggest a vacuum pump to put the crank case in vacuum, but those are typically only seen in race engines.
I don't see a vacuum leak, help me understand what your saying. Thanks for the help!
The vacuum leak may be minor, but it's probably causing a lean condition that you haven't noticed.
Chad
https://ls1tech.com/forums/generatio...fo-needed.html
09-29-2017, 08:50 AM
#672
I guess I don't have a 'fresh air' inlet. As I stated, all three connections go to the catch can and then one line from the catch can goes back to the intake.
Chad
09-29-2017, 09:25 AM
#674
Answers in bold.
This thread has further diagrams of how PCVs are routed:
https://ls1tech.com/forums/generatio...fo-needed.html
This thread has further diagrams of how PCVs are routed:
https://ls1tech.com/forums/generatio...fo-needed.html
On this diagram it shows my driver side PCV and my LS6 Valley Cover coming together with a TEE and then to the Catch can and then out into the intake. I got that!
It also shows the passenger side connection going to the side of the Throttle body, I don't have that. My electronic throttle body which is a 92MM Gold Blade, does not have that connection. My Edelbrock elbow doesn't have that connection either. The Edelbrock Vic Jr intake has a port (threaded hole) in the side of the intake that I am using as the return line from the Catch Can.
Do I need to make a connection somewhere from the Passenger side connection to the intake somewhere or just cap it off?
Chad
09-29-2017, 09:31 AM
#676
It also shows the passenger side connection going to the side of the Throttle body, I don't have that. My electronic throttle body which is a 92MM Gold Blade, does not have that connection. My Edelbrock elbow doesn't have that connection either. The Edelbrock Vic Jr intake has a port (threaded hole) in the side of the intake that I am using as the return line from the Catch Can.
Do I need to make a connection somewhere from the Passenger side connection to the intake somewhere or just cap it off?
Chad
Do I need to make a connection somewhere from the Passenger side connection to the intake somewhere or just cap it off?
Chad
The threaded hole in the intake for the return line sounds correct, but it sounds like it's just putting the system in slight vacuum without clearing/refreshing the air. Vacuum isn't a bad thing, and actually provides some benefit, but the other objective of clearing blowby and contaminated vapors from the crank case isn't happening like it should.
Is your TB more like the one on the left or right?
Here's an example of where the air is drawn for the valve cover (rocker cover) on a typical TB
Last edited by BudRacing; 09-29-2017 at 09:46 AM.
09-29-2017, 09:48 AM
#677
Mighty Mouse;
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
I have a 383, 4" crank, heads, cam and I am running a Vic Jr with a 92mm FBW TB and an LS6 Valley cover.
I have 3 oil vents on this set up. Passenger side, valley cover and Drivers side PCV.
Currently I have routed the PS & VC in to a TEE then connected that with the DS PCV (with a tee) to a Mike Norris catch can and then routed back into the intake.
Do you see a problem with that?
Thanks!
Chad
to run a pcv system, the final leg to the intake manifold must include only one line and that line must include the pcv valve or orifice to control the vacuum exposure to the crankcase.
you cannot Tee an unrestricted port in with the pcv port/valve. the air will take the path of least restriction, and the pcv valve will lose control of the system.
all of the MMS cans for PCV systems have a one-way pressure release top to control crank pressure without upsetting pcv closed loop function, or the tune.
09-29-2017, 09:52 AM
#679
i posted this in this thread already, reply #625
if you have a throttle body without the fresh air port then you need to add one to also match how the newer cars with these ports do it. after the maf and in front of the tb blade.
some that make aftermarket couplers have a port molded into them as well.
what is very important to NOT DO in general, is to delete something just because you don't understand it. thats a quick way to get yourself into trouble. research it. understand it, then decide what to do.
if you have a throttle body without the fresh air port then you need to add one to also match how the newer cars with these ports do it. after the maf and in front of the tb blade.
some that make aftermarket couplers have a port molded into them as well.
what is very important to NOT DO in general, is to delete something just because you don't understand it. thats a quick way to get yourself into trouble. research it. understand it, then decide what to do.
Last edited by MIGHTYMOUSE; 09-29-2017 at 09:57 AM.
09-29-2017, 09:52 AM
#680
yes i see a problem.
to run a pcv system, the final leg to the intake manifold must include only one line and that line must include the pcv valve or orifice to control the vacuum exposure to the crankcase.
you cannot Tee an unrestricted port in with the pcv port/valve. the air will take the path of least restriction, and the pcv valve will lose control of the system.
all of the MMS cans for PCV systems have a one-way pressure release top to control crank pressure without upsetting pcv closed loop function, or the tune.
to run a pcv system, the final leg to the intake manifold must include only one line and that line must include the pcv valve or orifice to control the vacuum exposure to the crankcase.
you cannot Tee an unrestricted port in with the pcv port/valve. the air will take the path of least restriction, and the pcv valve will lose control of the system.
all of the MMS cans for PCV systems have a one-way pressure release top to control crank pressure without upsetting pcv closed loop function, or the tune.
Chad