Thanks Ray, this has actually been one of the most educational threads
ever...
-- - Josh Lowered 2000 Dakota CC 3.9L www.geocities.com/lenny187/dakota.html<raymond.irons@gm.com> wrote in message news:OF602E3791.6F24D162-ON85256DE9.005860B9@mail.gm.com... > > > <snip> What would the benefit of having a huge plenum area be? Wouldn't > you want > the air to just be force fed more directly into the cylinders? > > OK Josh, > You had to take me back to the bad old days of being a jet engine > mechanic. Basic turbine engine theory: this relies on some physics and > stuff to make it work but long story short, this is Bernoulli's theorem > which holds that: > > a) a convergent duct will increase velocity and decrease pressure > > b) a divergent duct will increase pressure and decrease velocity > > c) a straight duct will maintain even pressure and velocity. > > Why is this important? Because in the plenum area you want a large high > pressure air mass that is capable of being drawn into the engine as needed > for combustion which actually increases the amount of boost realized at the > compressor. > > > All engines, be they reciprocating (like ours) rotary (like Mazda) or > turbine (like jets) do the same thing, > > Suck, squeeze, bang, blow > > > > Ray Irons > Dover, DE > >
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