- When speed is increasing , IP and BP are likely increase too, but the IP is likely to increase more than BP because the higher speed will cause the friction increase too, according to the equation for IP = BP + FP. -The thermal Efficiency and overall Efficiency depends on the engine speed, but the Mechanical efficiency is decreased when higher speed due to the loss of friction. - Friction Power is proportional to the speed when higher speed power loss from the friction will increase accordingly. -When the higher speed, the torque is likely to decrease because the intake flow into the cylinder is less.
-Consumption of fuel depends on the cycle of the engine, the engine operates in high speed, it will be often ignite.