We really don't have enough data. But you would need 25% more torque at the rear wheel. He has an 8% increase in displacement, and depending on the heads, VE could actually increase and give 10% maybe 11% more torque. ANd that torque would be at a lower RPM. If he is geared lower, he could be multiplying the torque, for even greater torque difference. Even things like weight of wheels come into play. Lighter wheel allow for acceleration greater than the weight reduction (flywheel effect). Also, the stroked motor would have a flatter power curve, thus if the rolloff began at an RPM lower than than the peak torque of the shorter stroke motor, game over.Great point and that is what I was thinking. So based on that statement, would you agree that:
Since the faster bike weighs 25% more, he would need 25% more torque to offset the weight he is pulling. And if so, then can the extra 25% of required torque be developed purely by 7 cu/in of more stroke.?
I admit I am no engine builder nor have I ever raced another bike but that does seem like an awful lot to me. Does it to you?
Your right about a "lot of little pieces" all adding up to 1 big difference.
I have this feeling the heavier bike is hiding a Nox bottle.