Not to piss in anyone's cheerios but a motor IS NOT an air pump.......A compressor IS an air pump. A motor uses compression, timing fuel and airflow to produce complete or close to complete combustion which relies on HEAT and properly timed/burned fuel.............
Well Dom, they are both air pumps. Anything that creates a pressure differential to move a gas, fluid, or a semi-solid, is technically a pump. A vacuum cleaner, or even a fan is an air pump. An internal combustion engine is just a self perpetuating air pump because of the combustion process.