An internal combustion engine in which ignition of the fuel injected into the cylinder is performed by the heat of compression of the air charge.

An internal combustion engine that is a reciprocating engine in which gaseous fuel is mixed with air to form a combustible mixture in a cylinder which is fired by spark ignition.

A turbine that compresses air which is then mixed with fuel for combustion and expansion through a turbine section to generate relatively high power output for either mechanical drive or power generation.

An internal combustion engine that is an induction compression ignition exhaust engine which ignites a petrol air mixture with an electric spark.