How many CC equal to 1 Horsepower?

that depends on the engine. A CC just stands for cubic centimeters, which is referring to the engine size. That isn't the defining thing for Horsepower. HP is a unit of power, CC is a unit of size. Assuming the 1 HP is representing brake power and the Mean Effective pressure is defined or available then, The CC or Volume Displacement can be defined by using this formula: Brake Power= Brake Mean Effective Pressure X Volume Displacement (CC)