yes another BOV thread but a little different. I'm new to turbos and understand the basics in what one does but I'm more interested in how one actually works.

We'll take an APS BOV for an example.

This is what I think is happening, please correct me if I'm wrong. Inside the casing there is a metal shaft that blocks off air from escaping. Seated on the metal shaft is a spring, whose tension can be adjusted with the screw. There is also a "vaccum" nipple on the end there that you cannot see. That "vaccum" nipple also helps create pressure on the backside of the metal plate to help the spring(?)

When you release the throttle, the throttle plate swings shut, all that built up air is looking to go somewhere. That little "vaccuum" nipple also is no longer producing pressure but is now in vaccum mode, or sucking the metal plate against the spring. That sucking combined with the built up pressure overcomes the spring pressure and allows the BOV to vent, wether it be to the air or back into the intake tube.

Again please correct me where I'm wrong.

Thanks in advance!

-Chee

 

you are correct in a nutshell

 

Agreed +1

 

Here you go!

https://www.evolutionm.net/forums/sh...ad.php?t=24611

 

gracias mi amigos!

 

De nada!