interesting header-exhaust port alignment on Honda "Fireblade" engine

[Dan Timberlake]

https://news.webike.net/wp-content/uplo ... 80x454.jpg

https://moto7.net/imgs/honda-cbr1000rrr-32.jpg

Cross section drawings presumably from the factory don't match the pictues of the cut-away show job engine.
https://www.hondaprokevin.com/pictures/ ... -rr-24.jpg

Maybe the pipe slice is not on the port centerline.....

[hoffman900]

Curious as to the step, but as far as the radius / exhaust port, packing trumps power in this application.

The radiator sits just in front of the header and the wheel / tire is very close to the radiator.

These applications make more power than they can put down. At most road race tracks, a Superbike is “all in” power wise maybe 10-15% of the lap. Losing some peak power to make the bike more compact, aerodynamic, and focus handling overrules some power gains by fixing the exhaust port exit.

[learner1]

I own a fire blade. Is this for the new 220hp version?

[Kevin Johnson]

...
Maybe the pipe slice is not on the port centerline.....

Correct. The pipe slice is not in the same plane and creates an optical illusion.

[dwilliams]

That inlet tract shape looks peculiar too.

[hoffman900]

That inlet tract shape looks peculiar too.

Looks like a ramp to help steer / promote tumble. Looks a lot like you see in the Honda white papers with their other contemporary designs (like the new NSX engine).

This engine is 220hp/L from the factory. Emissions legal, pump gas, etc.