Question for you turbo...

[Todd Phenneger]

AGreed,
  I see the point being made.  \
Question...some Bypass valves open by vacuum and not
manifold PRESSURE.  If its vacuum that opens it then
there should be little pressure in EM to overspin
turbo with.  RIGHT???  
  l8r
    TOdd

--- Jukka Majanen <jiipm at sci.fi> wrote:
> 
> 
> ><< Heya,
> >   Only one point I want to make.  Its not a Blow
> off
> > or Pop Off valve.  They vent to atmosphere.  Its a
> > recirculation or bypass valve.  >>
> 
> Hi
> 
> Todd maybe You`re right, that Pop-off mostly means
> blow out and by-pass: blow into suction, but...
> 
> It doesn`t matter where it blows the compressed air,
> atm or for recirculation. It can cause the same
> problem
> -charger overspeeding, that was the point.
> 
> When the engine is loaded hard and the valve opens 
> quickly, as those safety valves usually do. Meantime
> there is full pressure and flow in the turbine side,
> of 
> course it will accelerate. 
> 
> Reason for this situation can, for example, be too
> tight
> setting for W/G spring or a damaged diaphgram. Now
> if there isn`t a pressure switch ( or it`s over
> rided ), the
> blow-off, or whateveronewants valve starts to
> regulate, 
> without any pass by in exhaust side. After a certain
> time
> this overspeeding will cause damages. 
> 
> Also long, hard run with damaged air hose can mean 
> same overspeed problems. But that is easy to hear.
> 
> If one wants so high boost, that it`s over the
> blow-off
> valve setting, there must be lots of more
> modifications,
> than only B/O valves setting and it is a different
> story.
> 
> My best
> 
> j-pm -91 cq
> 
> 
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=====
Todd Phenneger
    83' ur-q (awaiting a 20vt)
    84' 4ktq  fun but I'm sick of CIS.

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