No, I meant what I said. What you say about the intake manifold is
correct, but the TB is different. This is due primarily to the hour-glass
shape of the bore, resulting in a shrouding effect over 1/2 of each bore.
This design helps reduce shock off-idle (to both occupants, driveline parts,
as well as payload... horse trailer). OTHO, if you install a much larger
bore TB, you can loose low-end... howerver with a port job by a
knowledgeable person, a larger TB will not hurt ANY performance at ANY rpm.
> I think Jon meant to say that DECREASED low-end is unavoidable w/a ported
TB.
> This is due to the fact that air moves slower through a larger orifice.
The
> benefit is higher volume potential as realized in the upper-end of the rpm
scale
> at a cost of low-end torque. This is also the basis of the factory
"beer-keg"
> intakes as installed on all 5.2 & 5.9L magnum engines. The smaller and
longer
> port runners give high speed airflow at low rpm's resulting in lots of
low-end
> torque but at the cost of limited upper-rpm flow potential.
>
> Latr,
>
> Shane
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