<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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