One side of the valve is plumbed into the the inlet manifold...
When the throttle body is shut, the vacuum that is created works on the
piston in the BOV and opens aided by the boost pressure on the other side of
the valve...
This releases the pressure and "psssst"
Hope that makes sense.
-----Original Message-----
From: Julian [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, September 19, 2000 16:15
To: [EMAIL PROTECTED]
Subject: Re: What is a BOV?
yep what pressure does it release at? 50psi?
Terry Rudd wrote:
> Julian,
> You got a variety of answers to this eh - come on turbo guys, you should
> know the correct answer to this question.
>
> Wastegate - bleeds excessive boost to either exhaust or atmosphere ie sets
> the output pressure of the turbo
>
> Over Boost Valve (OBV) - bleeds excessive boost from the inlet to
atmosphere
> if the wastegate fails ie engine protection
>
> Blow Off Valve (BOV) = bleeds boosted air whist the butterfly is in the
> closed position from between the turbo outlet and the throttle body to
> either atmosphere (pssst) if using a MAP sensed computer or to the inlet
> side between the airflow meter and the turbo if using VAFM or MAF sensed
> computer and an intercooler is recommended for the later AFM types as the
> air is hot from the first time round. The purpose of the BOV is to prevent
> the turbine stalling when the throttle body is closed and is triggered by
> low vacuum in the manifold.
>
> terry
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Julian
> Sent: Monday, 18 September 2000 3:01 PM
> To: OZDAT
> Subject: What is a BOV?
>
> Ok, yeh i know what a BOV is used for, but what a BOV actually do?
>
> >From what i can tell it is just a pressure relief valve, so when a
> certain pressure on the BOV is attained, it releases, letting a large
> amount of pressure through the valve (back into the intake or to
> atmosphere).
>
> If this assumption is correct, then what i want to know is what pressure
> do BOV's usually vent at?
>
> Could you use any valve which has enough flow when it vents?
>
> The reason i am asking is because i have contacts at a large pneumatic
> supplier so I can possibly experiement with different industrial valves
> if i can find any that fit the purpose..
>
> just a thought anyway
> - Julian
>
