It would be good to include a small section overviewing the 4 strokes of an internalcombustion engine and some interesting calculations on carengines. You should investigate how torque is related to the radius of the crankshaft andalso discuss why car engines are very inefficient. Of course you may go into detail about anyspecific area about engines. There is a lot of opportunity with summing the forces to analyze engines or you may also wish to look into the energy contained in fuel etc. The goal of the project is 5 pages and youmay certainly write more.
Please make sure that the idea is great.