Those are not my assumptions.

两个引擎：引擎 1和2
引擎1最大马力 p1@r1
引擎2最大马力 p2@r2
p1>p2, r1>r2.并且各自的扭矩曲线都是平坦的（locally flat).

I ask for the POWER curve to be locally flat, not the TORQUE curve.

例子2：
引擎1 300hp@6000 rpm
引擎2 280hp@5000 rpm
引擎1 的扭矩一直都是262.5lb.ft左右。引擎2的扭拒都是294lb.ft

You can't make the assumption that "引擎2的扭拒都是294lb.ft". I want Engine 2's torque to be 1,400 lb.ft at 1000 rpm. And I want Engine 1's torque to be 10 lb.ft at 1000 rpm. They are consistent with your assumptions of peak power figures.