Ooh I hadn t seen this animated 4 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 4 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