Abstract: A six cycle combustion engine is disclosed which utilizes the 5th and 6th cycle for drawing in and expelling preheated air to further warm the combustion chamber. The flow of the coolant water has been reversed so that heat absorbed in the engine head will flow to the cylinder walls and give a warming trend thereto. In addition, a fuel system is disclosed which insures the complete mixing of air and fuel vapor molecules prior to their deliverance to the intake of the engine.