Water Injection Thread

[Gary Derian]

Good info, Greg.  One question, though.  Wouldn't the sound energy in the
exhaust from a tuned system direct more energy to the exhaust turbine?
Turbines may like to have a steady flow but shouldn't additional energy
help?  I thought that was the idea behind dual scroll exhaust housings.  A
megaphone would convert velocity into pressure but the exhaust ultimately
has to speed up again (and drop pressure) to flow through the exhaust
housing.

Gary Derian <gderian at cybergate.net>

>snip<
>Now for the more sophisticated stuff. First of all, any turbine runs more
>efficiently with a STEADY inlet pressure. Any engine runs more efficiently
>with tube headers--turboed or not. How to reconcile these two things?? It
>is known as a pressure recovery accumulator. If you have room, (a mighty
>big if) run the header tubes into a typical, properly sized
>convergent-divergent collector, and THEN  run the megaphone from the
>collector into an accumulator chamber which feeds the gas to the turbine,
>at a fairly steady pressure. This pressure will also be distinctly higher
>than the pressure which the engine "sees" at the throuat of the collector
>(you are now converting the velocity energy in the exhaust gasses back into
>static pressure with a reasonable degree of efficiency!)
>
>Regards, Greg
>