27-01-2006, 18:18
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VW Enthousiast
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Join Date: Jan 2005
Posts: 270
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Voor een compressor heb je inderdaad een Blow-Off Valve nodig...
Heb dit quoteje even van de MegaSquirt pagina's geleend. Misschien heb je wat aan die Bosch onderdeelnummers...
Quote:
A blow off valve (BOV) prevents excessive pressure in the inlet system. While this sounds superficially similar to a wastegate, it operates differently, and is used for a different purpose. The blow off valve is situated in the inlet tract before the throttle blade(s) and is used to prevent surge (excessive pressure in the compressor housing) when the throttle is closed suddenly while the turbocharger is at speed. The blow-off valve opens at a few psi above the maximal boost level, and prevent damaging excessive pressure (called surge) in the compressor.
Common BOVs are the Bosch part numbers:
* 0 280 142 001,
* 0 280 142 102,
* 0 280 142 103,
* 0 280 142 104,
* 0 280 142 105,
* 0 280 142 106,
* 0 280 142 108,
* or a similar unit used in turbo Porsches with Bosch PN 0 280 142 108.
The Porsche part number is 993.110.337.50, and they call it an “air cut-off valve”. 1996 9000 Saab Turbos use the Bosch PN0 280 142 103. You might also consider Bosch PN 0 280 142 110(Saab dealer PN 4441895 - called a “bypass valve” or “compressor over-pressure valve”), which offers a higher boost threshold. All of these have connections for 1" inlet and outlet hoses. The 0 280 142 103 BOV costs about $37. In Canada, you order Saab part number 30544792, for about $75Cdn.
A well-engineered turbocharger set-up needs both a wastegate and a blow-off valve if high boost levels will be used.
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