Rich Rohrich said:
motometal (or anyone else that wants to play along at home) - Think about these things and the whole thing might be a bit clearer.
- What determines PEAK horsepower?
- What determines PEAK torque?
- What determines the area under the torque peak?
- What does the area under the torque peak on a 4 cyl 600cc Honda look like compared to a Honda CRF450?
- How did they attain that difference in the area under the curve?
- How would that area under the curve difference potentially translate into a difference in service intervals?
I'll study dyno charts when I get a chance and see what conclusions I can draw. Max rpm and how high the torque peak is in the range, will have a big effect on HP because HP =torque x a constant. A chart with a higher torque peak should have more area under the curve as well. These aren't always the most user friendly motors to run though, if you aren't racing (because you may be way under the peak torque rpm under normal conditions) so it's a balance of brochure bragging rights/selling units vs. making the vehicle practical to ride/drive etc.
It would be interesting to see a piston, a valve, a rod etc. from one cylinder of a 1000 cc sport bike next to a 250F equivalent part.