ICE and ECE

Comparison between external combustion engine and internal combustion engine:
External combustion engine
Internal combustion engine
*Combustion of air-fuel is outside the engine cylinder (in a boiler)
* Combustion of air-fuel is inside the engine cylinder (in a boiler)
*The engines are running smoothly and silently due to outside combustion
* Very noisy operated engine
*Higher ratio of weight and bulk to output due to presence of auxiliary apparatus like boiler and condenser. Hence it is heavy and cumbersome.
* It is light and compact due to lower ratio of weight and bulk to output.
*Working pressure and temperature inside the engine cylinder is low; hence ordinary alloys are used for the manufacture of engine cylinder and its parts.
* Working pressure and temperature inside the engine cylinder is very much high; hence special alloys are used
*It can use cheaper fuels including solid fuels
*High grade fuels are used with proper filtration
*Lower efficiency about 15-20%
*Higher efficiency about 35-40%
* Higher requirement of water for dissipation of energy through cooling system
*Lesser requirement of water
*High starting torque
*IC engines are not self-starting