Quote:
Originally Posted by kach22i
I met an engine intake specialist from S. Korea about 15 years ago he was a guest/coworker of someone at a family Thanksgiving gathering. In short with many false generalizations and exceptions to the rule he said; the longer the intake tube the better the low end torque at expense of the high rpm power and vice versa the shorter the intake tube the worse the low end torque is but the power band moves upward to the higher RPM's.
Porsche addressed this with their VarioRam induction system, a system that kind of varies the length of the manifold air intake.
I could not find a good animation that explains the opening of the various intake chambers, but I think of it like a winded musical instrument, perhaps a trumpet with three valves that in effect shorten or lengthen the intake length.
https://talkingtrumpet.wordpress.com...-animated-gif/
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Quite a few manufacturers have used this over the years. Honda and Toyota have had versions on the Civic and Corolla, respectively, at different periods.