The Air Driven Engine is an eco-friendly engine which operates with compressed air. An Air Driven Engine uses the expansion of compressed air to drive the piston of an engine. An Air Driven Engine is pneumatic actuators that create actual work by expanding compressed air. There is no mixing of fuel with air there is no combustion. An Air Driven Engine makes use of compressed air technology for its operation. The compressed air technology it quite simple. If we compressed normal air into a cylinder the air would hold some energy within it. This energy can be utilized for a useful purpose. When this compressed air expands, the energy is released to do work. So this energy in compressed air can also be utilized to displace the piston.