What is the bottom-end of an engine and also what is the top end?

Bottom end can be used to describe the rod, crank, piston,block as well as peformance at low rpm. When they say an engine has no bottom end it means it is weak on torque at low rpms.

Top end usually refers to the button and heat sink. It is also used to describe high rpm peformance. No top end means it will not carry many rpms.

Is that what you were refering to??

if an engine has alot of bottom end tghat means ti has alot of power in the lower/bottom end of the rev range, same with top end

OK thanks guys