Message text written by Randall Young
>But, the standard TR3/4 intake manifold features huge passages, and
>somewhat unfortunate geometry. The TR4A manifold was the result of some
>addition performance tuning, and addresses these problems with gentler
>curves and smaller passages.
Sure, abrupt changes in direction cause their own problems. Air moving an
a particular direction has a certain inertia and kinetic energy. When it
encounters an abrupt change in direction it looses much of this energy and
must pick up a new kinetic energy vector in the new direction. That and
the resulting turbulence all add up to a pressure drop.
A quick look at various modern cars (which benefit from much gas dynamic
engineering thanks to computer modeling and greatly enhanced economical
manufacturing techniques) shows manifolds with smooth curves, more or less
straight runs (where possible) and uniform runner ID's. A lot can be
learned through observation.
Cheers
Dave
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