HC which is harmful to body is searched and find the 87mm is bigger than 75mm under certain time as the consuming of 7.6lit/h. With the increasing temperature the inflamer is high, the temperature is big. If 0.14ml/s or above is outlet interface, it is known to be how much it is. The biggest 250Kg of force will happen here when cylinder diameter is 70mm. The force will incline with the increasing temperature and diameter. The volume decreases when engine rotation increase with little 5.8lit/hr. The economic efficiency of the volume is the lowest in the first stage which attains 1/4~1/6 times emission.