ooh i hadn't seen this animated stroke engine image i agree it's grand thanks for pointing to it a wish list or shopping list h'mm well i suppose we ought to decide what we're after something between a representative schematic and an illustration with elements of both possibly centred around this stroke engine animation to add would be the intake tract air cleaner intake manifold and the exhaust tract exhaust manifold catalytic converter muffler pipeworks i would think it best to gloze over the fuel system to avoid the decision of carburettor s or fuel injection the point of the exercise is to have an illustration of airflow through the engine as installed in the vehicle do you agree