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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