Quote:
Originally Posted by Daishi
Thats still not entirely correct.. the long tubes increased torque for the Z accross the entire rpm range vs any of the shorties available for the z. And power has increased over the entire rpm range it depends on the exhaust your running.
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Thats the general rule of thumb as far as relative runner length for any combustion engine (which I wrote totally ***-backwards)... you can develop a stepped design that will widen the powerband, which may be the case here, but if the power gains move in the opposite direction then VVEL tuning is likely to blame.
In
general, longer runners = peak torque moves down; shorter runners = peak torque moves up. Pipe diameter will fix total possible peak power.
Individual results may vary
Improved flow should (overall) move peak torque upwards too as you tend to see peak cylinder filling (and therefore empyting) at higher RPM's, depending on head design and displacement, that is...