Re: Indy pop-off valves

[PDQSHIP@aol.com]

In a message dated 96-03-01 11:39:24 EST, you write:

>functioning turbo actually be damaged by overspeeding due to no load on the
>compressor -- like if the IC or a turbo compressor output hose blows while
>WFO -- boost gets vented to the atmosphere and hence no overboost condition
>or automatic fool-pump shutdown?
Those problems usually make the turbos spin down pretty quickly, cuz the
engine basically stalles.....
 What would be the failure mode of an
>'overspeeded' turbo? Impeller explosion?
Sure, or bearing failure, causing the impellors to hit the housings, then see
your above....
> Or would the max speed be
>self-limiting? Lotsah people 'blowedup' ICs and hoses, but you don't hear
>about exploded turbos.....? (yet  :)
>
No need for a pop off valve in an audi....  I have one of the most radical
k26 based systems available and have run in excess of 22psi, no schrapnel
yet....

Scott