BR's dyno testing and new parts development continues...
Jun 25, 2008, 10:35 AM
#34
The valves that have been posted in MY thread about catch cans are one way check valves like a PCV correct? Which allows the breather to be attached to a boost/vacuum source to pull a vacuum under vacuum conditions and not push boost into the engine under boosted conditions, correct? If not please explain what the purpose is.
They are heavy-duty one-way check valves that will not clog, stick, or foul from oil sludge passing through them. The function you have posted above is correct. I have one between my stock PCV valve and intake manifold, and the other on the valve cover breather port with then runs to a catch-can, which is then run to the intake pipe. Setup this way, the crankcase should see vacuum under all engine conditions since when one valve is open the other is closed.
Jun 25, 2008, 10:49 AM
#35
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How is this any different from the Saiko-Kun dual catch can, which has been around for a while?
There was a rather extended discussion about catch cans a while back:
PCV discussion: https://www.evolutionm.net/forums/sh...d.php?t=200793
Saiko-Kun catch can: https://www.evolutionm.net/forums/sh...d.php?t=209109
FWIW, I've been running the dual catch can for over 2 years now in between the intake manifold and PCV vent on the back of the head, and the intake pipe and PCV vent on the side of the head. Works great ... doesn't usually collect much on the intake manifold side, but does collect more gunk on the intake pipe side.
l8r)
There was a rather extended discussion about catch cans a while back:
PCV discussion: https://www.evolutionm.net/forums/sh...d.php?t=200793
Saiko-Kun catch can: https://www.evolutionm.net/forums/sh...d.php?t=209109
FWIW, I've been running the dual catch can for over 2 years now in between the intake manifold and PCV vent on the back of the head, and the intake pipe and PCV vent on the side of the head. Works great ... doesn't usually collect much on the intake manifold side, but does collect more gunk on the intake pipe side.
l8r)
Jun 25, 2008, 11:06 AM
#36
If David's setup is not vacuum assisted through the intake manifold then there is no need for a one-way valve. Seeing as the Turbo Intake doesn't reach positive pressure, there is no need to restrict the direction of flow with a valve that also restricts the amount of air that can be flown in the desired direction.
It seems the difference between this and the DC series cans that Saikou Michi sells is that David's is one large can for both ports that drains back into the engine and is only vacuum assisted by the intake.
It seems the difference between this and the DC series cans that Saikou Michi sells is that David's is one large can for both ports that drains back into the engine and is only vacuum assisted by the intake.
Jun 25, 2008, 11:08 AM
#37
The post is fine, don't delete it. I can live with it. Thank you for the information.
I want to explain this further now that I have more information from everyone.
The valve that was pictured from S2kracka is a good idea to insure that no boost pressure from the intake manifold is pushed back into the valve cover/crankcase. It is not the same part or principle that I am doing with this can.
The other catch can set up that ludikrat is talking about I have seen. I did not go read the thread, maybe in a little while I will.
The main difference between any other catch can and the one I have built is the oil that ends up in the can is sent back to the oil pan. The can will never fill up or leak, doesn't have to be drained and because of this will only pull clean vapors back through the turbo, no oil.
I want to explain this further now that I have more information from everyone.
The valve that was pictured from S2kracka is a good idea to insure that no boost pressure from the intake manifold is pushed back into the valve cover/crankcase. It is not the same part or principle that I am doing with this can.
The other catch can set up that ludikrat is talking about I have seen. I did not go read the thread, maybe in a little while I will.
The main difference between any other catch can and the one I have built is the oil that ends up in the can is sent back to the oil pan. The can will never fill up or leak, doesn't have to be drained and because of this will only pull clean vapors back through the turbo, no oil.
Jun 25, 2008, 11:14 AM
#38
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...The main difference between any other catch can and the one I have built is the oil that ends up in the can is sent back to the oil pan. The can will never fill up or leak, doesn't have to be drained and because of this will only pull clean vapors back through the turbo, no oil...
I do have to drain mine periodically
l8r)
Jun 25, 2008, 11:23 AM
#39
Dave, nice work , I too have about half of my system complete,
this is what I came up with,
I have the part that goes from my stock pcv to the air/oil separator and then to the intake manifold.
I will be doing a return to the block from the bottom of the baffled catch can, The hole in the block that I will using, is the little bolt, that you stick a screw driver in when you need to stop the balance shaft from spinning during a timing belt change.
Good luck with your project.
this is what I came up with,
I have the part that goes from my stock pcv to the air/oil separator and then to the intake manifold.
I will be doing a return to the block from the bottom of the baffled catch can, The hole in the block that I will using, is the little bolt, that you stick a screw driver in when you need to stop the balance shaft from spinning during a timing belt change.
Good luck with your project.
Jun 25, 2008, 11:27 AM
#40
I cannot vent our can to the intake with a one way valve, if this was done underboost the crank case would build pressure and smoke like a freight train, like it did on the dyno. In order to do that you need a breather on the catch can or an open hole or something.
In the case of our system it is completely closed, no open vent, no breather. It has to be vented to the turbo inlet when doing this.
In the case of our system it is completely closed, no open vent, no breather. It has to be vented to the turbo inlet when doing this.
.
Jun 25, 2008, 11:54 AM
#44
I cannot vent our can to the intake with a one way valve, if this was done underboost the crank case would build pressure and smoke like a freight train, like it did on the dyno. In order to do that you need a breather on the catch can or an open hole or something.
In the case of our system it is completely closed, no open vent, no breather. It has to be vented to the turbo inlet when doing this.
In the case of our system it is completely closed, no open vent, no breather. It has to be vented to the turbo inlet when doing this.
Also, do you think you will get around to doing some datalogging of crankcase pressure? This would be cool to see.
Have you ever thought the factory valve cover ports needed to be bigger to vent the crankcase better?
Jun 25, 2008, 02:00 PM
#45
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How is this any different from the Saiko-Kun dual catch can, which has been around for a while?
There was a rather extended discussion about catch cans a while back:
PCV discussion: https://www.evolutionm.net/forums/sh...d.php?t=200793
Saiko-Kun catch can: https://www.evolutionm.net/forums/sh...d.php?t=209109
FWIW, I've been running the dual catch can for over 2 years now in between the intake manifold and PCV vent on the back of the head, and the intake pipe and PCV vent on the side of the head. Works great ... doesn't usually collect much on the intake manifold side, but does collect more gunk on the intake pipe side.
l8r)
There was a rather extended discussion about catch cans a while back:
PCV discussion: https://www.evolutionm.net/forums/sh...d.php?t=200793
Saiko-Kun catch can: https://www.evolutionm.net/forums/sh...d.php?t=209109
FWIW, I've been running the dual catch can for over 2 years now in between the intake manifold and PCV vent on the back of the head, and the intake pipe and PCV vent on the side of the head. Works great ... doesn't usually collect much on the intake manifold side, but does collect more gunk on the intake pipe side.
l8r)
