Clearing up misconceptions of PCV systems
Will do Pinky, I should have a few here in the latest run.
ta_06374, if you have breather filters on each valve cover it will work fine and just emit quite a bit of oil vapor smell. What causes an issue is have a couple of open hoses running off the valve cover nipples and just hanging towards the ground which can ingest unfiltered debris into the crankcase over time.
Hope this helps.
Mike Norris
ta_06374, if you have breather filters on each valve cover it will work fine and just emit quite a bit of oil vapor smell. What causes an issue is have a couple of open hoses running off the valve cover nipples and just hanging towards the ground which can ingest unfiltered debris into the crankcase over time.
Hope this helps.
Mike Norris
Robert
So, I rev mine out to 7,400 NA and will be adding a 300 shot very soon.. It's not a dialy driver, more of a weekend fun truck. Right now I have a single breather, but I was thinking about running tubes down to the header collectors. What do you supose I do?
Last edited by LIL SS; May 6, 2008 at 12:32 AM.
No, but if you do not have make up air (filtered) coming in & vacuum to "flush" the harmfull & corrosive gasses out you will do damage over time. All you are doing with the breathers is relieving excess crankcase pressure & most of the harmful stuff that flashes off at temp will re-condense into the crankcase & contaminate the oil & corrode the parts not imerrsed in oil.
Okay, so let me get this straight... based on the picture below:
the PCV system works like such:
In through the throttle body, then into the front end of the passenger side valve cover. Through the motor, and out of the back end of the driver side valve cover, yes? Then through the PCV valve, and into the split hose with one end into the back end of the passenger side valve cover, and one end into the intake? Or does it split first, then one end through the PCV valve into the intake and the other into the back end of the passenger valve cover? Basically I'm just curious if the PCV valve comes before the split or after... inline with the single hose running from the split to the intake. Any help would be much appreciated. Thanks!
the PCV system works like such:
In through the throttle body, then into the front end of the passenger side valve cover. Through the motor, and out of the back end of the driver side valve cover, yes? Then through the PCV valve, and into the split hose with one end into the back end of the passenger side valve cover, and one end into the intake? Or does it split first, then one end through the PCV valve into the intake and the other into the back end of the passenger valve cover? Basically I'm just curious if the PCV valve comes before the split or after... inline with the single hose running from the split to the intake. Any help would be much appreciated. Thanks!
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Okay, so let me get this straight... based on the picture below:
the PCV system works like such:
In through the throttle body, then into the front end of the passenger side valve cover. Through the motor, and out of the back end of the driver side valve cover, yes? Then through the PCV valve, and into the split hose with one end into the back end of the passenger side valve cover, and one end into the intake? Or does it split first, then one end through the PCV valve into the intake and the other into the back end of the passenger valve cover? Basically I'm just curious if the PCV valve comes before the split or after... inline with the single hose running from the split to the intake. Any help would be much appreciated. Thanks!
the PCV system works like such:
In through the throttle body, then into the front end of the passenger side valve cover. Through the motor, and out of the back end of the driver side valve cover, yes? Then through the PCV valve, and into the split hose with one end into the back end of the passenger side valve cover, and one end into the intake? Or does it split first, then one end through the PCV valve into the intake and the other into the back end of the passenger valve cover? Basically I'm just curious if the PCV valve comes before the split or after... inline with the single hose running from the split to the intake. Any help would be much appreciated. Thanks!
If you use a oil seperating catch can you will just plumb it inline between the one hose & the PCV valve. I can't believe I am still seeing the open hoses hanging down ruining motors....just use a little common sense, you do NOT want open unfiltered openings into your motor for dirt & water to get into!
Launching!
Joined: Apr 2006
Posts: 213
Likes: 0
From: Back to Newport News
I did the !AIR mod to my '02 SS awhile ago, and completely removed all of the check valves and lines. There was only one line, coming off of the intake, that was left. It is a small line running to the back of the intake. I didnt have anything at the time to plug it with, so I just wrapped some electrical tape around the end of it. Is this ok? And does this have anything to do w/ the PCV system? Sorry if this sounds ignorant, but I havent given this much thought until now.
I did the !AIR mod to my '02 SS awhile ago, and completely removed all of the check valves and lines. There was only one line, coming off of the intake, that was left. It is a small line running to the back of the intake. I didnt have anything at the time to plug it with, so I just wrapped some electrical tape around the end of it. Is this ok? And does this have anything to do w/ the PCV system? Sorry if this sounds ignorant, but I havent given this much thought until now.
If you do not, the harmful byproducts of combustion will re-condense into the crankcase every time the motor cools down doing slow damage over time. If you would like, take some detailed pictures & I will guide you on doing it right.
looking at the picture above, it would seem that the fresh incoming air would short cycle on the passenger side. Freash air would come in the front port, travel along the top of the rockers, and come out the rear port and then back to the PCV. I am sure it would pull some from the driverside and up from the block, but not as much as flows from just one end of the valve cover to the other. It would make more sense to me, to cap the rear nipple on the passenger side. Then get rid of the Y at the back and just pull all the returning air from the rear of the driverside valve cover.
This would then force all the air to fully travel through the entire block and out the other side. What do you think. I wonder what the reason for the split at the rear was for? Air travels the path of least resistance.
Mike
This would then force all the air to fully travel through the entire block and out the other side. What do you think. I wonder what the reason for the split at the rear was for? Air travels the path of least resistance.
Mike
looking at the picture above, it would seem that the fresh incoming air would short cycle on the passenger side. Freash air would come in the front port, travel along the top of the rockers, and come out the rear port and then back to the PCV. I am sure it would pull some from the driverside and up from the block, but not as much as flows from just one end of the valve cover to the other. It would make more sense to me, to cap the rear nipple on the passenger side. Then get rid of the Y at the back and just pull all the returning air from the rear of the driverside valve cover.
This would then force all the air to fully travel through the entire block and out the other side. What do you think. I wonder what the reason for the split at the rear was for? Air travels the path of least resistance.
Mike
This would then force all the air to fully travel through the entire block and out the other side. What do you think. I wonder what the reason for the split at the rear was for? Air travels the path of least resistance.
Mike
I am now thinking that maybe they did it this way for a reason. You can not have flow if the system is under vacuum. By allowing the fresh air to come in, you create flow. By having two ports, they may have intentionally wanted the fresh "humid" air to stay out of the block. This way they have the inlet neccessary to creat flow to pull the vapors out without having to run the fresh air around the internals.
Or they just designed it this way cause somebody thought two ports are better than one.
Any info on wheteher your catch can utilizes any stainless mesh inside to help collect oil.
Mike
Or they just designed it this way cause somebody thought two ports are better than one.
Any info on wheteher your catch can utilizes any stainless mesh inside to help collect oil.
Mike
I am now thinking that maybe they did it this way for a reason. You can not have flow if the system is under vacuum. By allowing the fresh air to come in, you create flow. By having two ports, they may have intentionally wanted the fresh "humid" air to stay out of the block. This way they have the inlet neccessary to creat flow to pull the vapors out without having to run the fresh air around the internals.
Or they just designed it this way cause somebody thought two ports are better than one.
Any info on wheteher your catch can utilizes any stainless mesh inside to help collect oil.
Mike
Or they just designed it this way cause somebody thought two ports are better than one.
Any info on wheteher your catch can utilizes any stainless mesh inside to help collect oil.
Mike
If space is an issue & you cant fit a 1 qt seperator, then Mike Norris makes a great unit that you can use 2 in series with good results. Our mounts on the pass cyl head on NA & Turbo applications, and on the brake booster on SC systems. We make a kit for most any application including the STS rear mount turbos.
Very good thread, and thanks to the thread starter.
I have one question. Many LS1 f-body owners have upgraded to the LS6 valley cover (including me). If somebody is using that valley cover should the PCV setup be done as they did it here:
http://www.ls1howto.com/index.php?article=18
Is blocking off the 2 rear ports on the valve covers good, or should they be left as a supplement to the valley cover?
Thanks
I have one question. Many LS1 f-body owners have upgraded to the LS6 valley cover (including me). If somebody is using that valley cover should the PCV setup be done as they did it here:
http://www.ls1howto.com/index.php?article=18
Is blocking off the 2 rear ports on the valve covers good, or should they be left as a supplement to the valley cover?
Thanks
Last edited by bowtieman81; Aug 3, 2008 at 09:07 PM.
Very good thread, and thanks to the thread starter.
I have one question. Many LS1 f-body owners have upgraded to the LS6 valley cover (including me). I somebody is using that valley cover should the PCV setup be done as they did it here:
http://www.ls1howto.com/index.php?article=18
Is blocking off the 2 rear ports on the valve covers good, or should they be left as a supplement to the valley cover?
Thanks
I have one question. Many LS1 f-body owners have upgraded to the LS6 valley cover (including me). I somebody is using that valley cover should the PCV setup be done as they did it here:
http://www.ls1howto.com/index.php?article=18
Is blocking off the 2 rear ports on the valve covers good, or should they be left as a supplement to the valley cover?
Thanks
but it seems to me with that rear port capped on the pass side it will flow through the entire crankcase, back up through the driver's side rockers, then down through the PR holes into the valley cover?
Maybe they had that rear port on the pass side to vent access air rushing through as not to cause too much pressure in the pass side valve cover but to help equalize both sides? remember the older style crankcases didn't vent hardly at all from bay to bay until they cast in those vents into the LS6 block.