"Graziano, Michael" wrote:
>
> Quick re-cap
> 4-1 = highest peak power header design, but narrowest rpm band
> 4-2-1 = broader rpm band, but not as high a peak. All other things equal
> Longer pipes = lower engine rpm power range
> longer collectors = better overall performance
It's all true to the extent of my knowledge. Honda's new CBR-929RR
comes with a
valve in the exhaust that switches it from 4-2-1 to 4-1 at a certain rpm. The
best non-turbo rotary exhausts are made to specific port sizes.
What I want to know is what frequency a 3-1 header with 45 degree
angles in the
"collector" is tuned at....
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'87 RX-7 TII: 1/4 mile in 7.500 sec @ 120 mph
'90 GS-500E: 1/4 mile in 8.182 sec @ 110 mph
MCMLXIX Sprite: 1/4 mile is reputed to be possible.
University of West Florida
Electrical Engineering.
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