Looking for a valve
Thread Starter
Melting Slicks
Joined: Mar 2002
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From: Tx
Looking for a valve
I’m looking for reverse blow off valve (one that opens with pressure on the control port).
Does anyone know of a simple cheap solution?
I want something that is shut with vacuum, but will open with 0+ psi of pressure.
My reason is this:
I want to hook my PCV system back up (to cut down on daily driving smell…). This will require me to put a filter on the exit of my 2nd catch can (which is basically functioning as a valve cover breather). The filter is required since it will actually be pulling in some unmetered air from that source. The filter will also cause a slight restriction for exiting crank case pressure while under boost and I do not want this. Instead, I want to add an additional free flowing exit point from the catch can that only opens under boost.
This should work well, the filter will only be used for incoming air and any crankcase pressure formed under boost will have a low restriction path to get out.
To be clear, my setup will have two catch cans. One between the intake manifold port and the valley cover nipple, and the other one will be hooked up to vent points on the valve covers.
Does anyone know of a simple cheap solution?
I want something that is shut with vacuum, but will open with 0+ psi of pressure.
My reason is this:
I want to hook my PCV system back up (to cut down on daily driving smell…). This will require me to put a filter on the exit of my 2nd catch can (which is basically functioning as a valve cover breather). The filter is required since it will actually be pulling in some unmetered air from that source. The filter will also cause a slight restriction for exiting crank case pressure while under boost and I do not want this. Instead, I want to add an additional free flowing exit point from the catch can that only opens under boost.
This should work well, the filter will only be used for incoming air and any crankcase pressure formed under boost will have a low restriction path to get out.
To be clear, my setup will have two catch cans. One between the intake manifold port and the valley cover nipple, and the other one will be hooked up to vent points on the valve covers.
Supporting Vendor
Joined: Jul 2003
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From: http://www.mphparts.com 800-364-1975
OK, I think this will work.
What if you used a wastegate to do this? Your only challenge would be finding a spring that would fit and would exert very little force on the diaphragm.
What if you used a wastegate to do this? Your only challenge would be finding a spring that would fit and would exert very little force on the diaphragm.
Pro
Joined: Nov 2004
Posts: 509
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From: Nevada
[QUOTE=QuickSilver2002]I’m looking for reverse blow off valve (one that opens with pressure on the control port).
Does anyone know of a simple cheap solution?
I want something that is shut with vacuum, but will open with 0+ psi of pressure.
Quicksilver call DINAN PERFORMANCE FOR BMW CARS tell them that you want the crankcase breather shut off valve for the E36 M3 supercharger kit this part will work for you. Caution it will not be cheap also it has 3 openings about 3/4 to 1 inch in size. It closes under vaccum and opens under boost to redirect crankase vapors under boost. I do not know the part #
Les
Does anyone know of a simple cheap solution?
I want something that is shut with vacuum, but will open with 0+ psi of pressure.
Quicksilver call DINAN PERFORMANCE FOR BMW CARS tell them that you want the crankcase breather shut off valve for the E36 M3 supercharger kit this part will work for you. Caution it will not be cheap also it has 3 openings about 3/4 to 1 inch in size. It closes under vaccum and opens under boost to redirect crankase vapors under boost. I do not know the part #
Les
Thread Starter
Melting Slicks
Joined: Mar 2002
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From: Tx
Originally Posted by Loboost
Quicksilver call DINAN PERFORMANCE FOR BMW CARS tell them that you want the crankcase breather shut off valve for the E36 M3 supercharger kit this part will work for you. Caution it will not be cheap also it has 3 openings about 3/4 to 1 inch in size. It closes under vaccum and opens under boost to redirect crankase vapors under boost. I do not know the part #
Les
Les
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From: http://www.mphparts.com 800-364-1975
Originally Posted by QuickSilver2002
Thanks for the info. That is a start. Only problem is, i'm a cheap bastard when it comes to stuff like this. There has to be something like this available at a low price.
Thread Starter
Melting Slicks
Joined: Mar 2002
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From: Tx
Originally Posted by diynoob
Any reason you couldn't get a cheap wastegate to do this?
I would have to find one and play with it. What happens if you remove the spring on a standard wastegate and hook it up to a manifold vacuum port? will the internal diaphram still open and close the plunger?
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From: http://www.mphparts.com 800-364-1975
Originally Posted by QuickSilver2002
Not sure if it would work.
I would have to find one and play with it. What happens if you remove the spring on a standard wastegate and hook it up to a manifold vacuum port? will the internal diaphram still open and close the plunger?
I would have to find one and play with it. What happens if you remove the spring on a standard wastegate and hook it up to a manifold vacuum port? will the internal diaphram still open and close the plunger?
Since you need this for a PCV setup, I would guess if you could get it to open around 1-2psi you'd still be in great shape since serious blowby isn't really occurring at those low boost levels (right?)
Here's a wastegate diagram I copied from another website...
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Thread Starter
Melting Slicks
Joined: Mar 2002
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From: Tx
Originally Posted by diynoob
I'm not sure, my guess is it would depend on the wastegate. You would probably in most cases need some kind of spring pressure to push the diaphragm and plunger back to where you wanted it... but I would guess you could tinker with this by stretching/cutting an old spring so that it exerts enough closing force but is not difficult to open.
Since you need this for a PCV setup, I would guess if you could get it to open around 1-2psi you'd still be in great shape since serious blowby isn't really occurring at those low boost levels (right?)
Here's a wastegate diagram I copied from another website...
Since you need this for a PCV setup, I would guess if you could get it to open around 1-2psi you'd still be in great shape since serious blowby isn't really occurring at those low boost levels (right?)
Here's a wastegate diagram I copied from another website...
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From: http://www.mphparts.com 800-364-1975
Originally Posted by QuickSilver2002
Yea, I was thinking that the vacuum on the diaphragm might also close the plunger (without the spring - or with a very weak spring)
Bet you can find a good deal on used wastegates on eBay.