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Old 01-29-2012, 09:23 AM   #7 (permalink)
sendler
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Location: Syracuse, NY USA
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Honda CBR250R FI Single - '11 Honda CBR250R
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Quote:
Originally Posted by drmiller100 View Post
your elbow would have to be a GENTLE curve or it will screw up the reverb - look at the exhaust pipe, not the header, for an example.

also, tuning the intake ONLY works at WOT. Do you need more power at a lower RPM?

And you can get second and third harmonics to work as well.
I'm trying to get the highest efficiency at cruise rpm which would often be 25% throttle so there is some disruption at 4 inches from the valves. But it would also be nice in competition to lower the first torque peak from the current 6,000 rpm and get the most efficiency for 90% load pulse and glide either side of 6,000 as opposed to the power band from 6,000 to 8,700 as it is now. I can also play with the cam timing as the gears are taper fit and can be timed anywhere. Shaving the head to raise compression from the stock 10.7:1 is also not out of the picture eventually. Will a closed pipe have a second harmonic or only odd order harmonics of 1,3,5?
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