Help BOV Install... Seen 2 diff ways what one is right.
#1
Help BOV Install... Seen 2 diff ways what one is right.
one we have go-tard Jim with his way where the diaphram is going back to the Turbo Inlet. *First two photos attached show it that way*
Then you have people who are VTA with the Diaphram faced to Charge pipe/intake pipe/cold side *other photo*
so yeah umm wtf what way is the right way to do it for non-VTA?
Then you have people who are VTA with the Diaphram faced to Charge pipe/intake pipe/cold side *other photo*
so yeah umm wtf what way is the right way to do it for non-VTA?
#6
Boost Pope
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It's a check valve made from a PVC plumbing fitting. Similar in concept to the JGS Precision VTA valve.
http://www.jgstools.com/turbo/oav.html
Most BOV valves leak when the engine is under vacuum. My FM piston-type for example is nearly wide-open when the engine is idling. The diaphram types probably do the same thing. This is a problem for AFM-equipped engines, since there's air entering the engine which wasn't metered, so the fuel mixture is wrong. Usually the engine will just plain stall under these conditions.
The valve is a one-way mechanism. Air can escape (under pressure) but it can't flow in under vacuum.
http://www.jgstools.com/turbo/oav.html
Most BOV valves leak when the engine is under vacuum. My FM piston-type for example is nearly wide-open when the engine is idling. The diaphram types probably do the same thing. This is a problem for AFM-equipped engines, since there's air entering the engine which wasn't metered, so the fuel mixture is wrong. Usually the engine will just plain stall under these conditions.
The valve is a one-way mechanism. Air can escape (under pressure) but it can't flow in under vacuum.
#9
Senior Member
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Join Date: Mar 2005
Location: Sammamish, Washington
Posts: 1,396
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It's a check valve made from a PVC plumbing fitting. Similar in concept to the JGS Precision VTA valve.
http://www.jgstools.com/turbo/oav.html
Most BOV valves leak when the engine is under vacuum. My FM piston-type for example is nearly wide-open when the engine is idling. The diaphram types probably do the same thing. This is a problem for AFM-equipped engines, since there's air entering the engine which wasn't metered, so the fuel mixture is wrong. Usually the engine will just plain stall under these conditions.
The valve is a one-way mechanism. Air can escape (under pressure) but it can't flow in under vacuum.
http://www.jgstools.com/turbo/oav.html
Most BOV valves leak when the engine is under vacuum. My FM piston-type for example is nearly wide-open when the engine is idling. The diaphram types probably do the same thing. This is a problem for AFM-equipped engines, since there's air entering the engine which wasn't metered, so the fuel mixture is wrong. Usually the engine will just plain stall under these conditions.
The valve is a one-way mechanism. Air can escape (under pressure) but it can't flow in under vacuum.
#17
It'd be easier to explain if you were looking at one, but there's basically a rubber diaphgragm attached to a valve seat that's spring-loaded. Kinda like a wastegate actuator.
If you connect it the wrong way, air flows into the side of the valve seat, but it'll still work because vacuum on the diaphgragm is pulling the valve up off the seat. Used this way, though, and the diaphgragm will wear out more quickly because the valve is being pushed sideways and may not seal well over time.
If you connect it the wrong way, air flows into the side of the valve seat, but it'll still work because vacuum on the diaphgragm is pulling the valve up off the seat. Used this way, though, and the diaphgragm will wear out more quickly because the valve is being pushed sideways and may not seal well over time.
#18
This is who I bought my "greddy type s" from. I should be getting it this week and will be doing my install next week. I can report back then how well the knock off is working for me. I'll be making a 300 mile trip to visit relatives and a 600 mile trip from there back to school. So I think I'll know well enough how its working after the trip.
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