Thanks Terry+Zac, I get the book and ask some serious questions then!
>From: "Terry Rudd" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: <[EMAIL PROTECTED]>
>Subject: RE: What is a BOV?
>Date: Wed, 20 Sep 2000 01:17:58 +1000
>
>Jordan,
>
>You could write a whole chapter on the different types of air flow sensing
>devices for turbo engines and here is not the place. Use the Internet for
>some tech info or a good auto bookshop. A book called "Maximum Boost" is a
>good read that's written in a fairly non-technical sort of way and it's
>widely regarded as the turbo bible and I recommend it as a good read.
>
>(thanks Zac)
>
>Terry
>
>-----Original Message-----
>From: [EMAIL PROTECTED]
>[mailto:[EMAIL PROTECTED]]On Behalf Of Zac Campbell
>Sent: Tuesday, 19 September 2000 5:00 PM
>To: [EMAIL PROTECTED]
>Subject: Re: What is a BOV?
>
>
>MAP - Manifold Air Pressure (Sensor)
>VAFM - Vane Air Flow Meter
>MAF - Mass Air Flow (Meter)
>AFM - Air Flow Meter
>
>All different methods of measuring the amount of air that enter the
>engine/manifolds. Someone could tell you more specifically how each do what
>they do!
>
>zac
>
>----- Original Message -----
>From: Jordan Wallis <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Wednesday, September 20, 2000 6:59 AM
>Subject: Re: What is a BOV?
>
>
> > Terry
> > Whats the difference between MAP,VAFM,MAF and AFM?
> >
> >
> > >From: Julian <[EMAIL PROTECTED]>
> > >Reply-To: [EMAIL PROTECTED]
> > >To: [EMAIL PROTECTED]
> > >Subject: Re: What is a BOV?
> > >Date: Tue, 19 Sep 2000 16:14:42 +1000
> > >
> > >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
> > > >
> > >
> >
> >
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>
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