A car engine can be classified based on the number of cylinders it has. It could be a 4 cylinder, 6 cylinder, 8 cylinder, 10 cylinder, or 12 cylinder (the last two engines are mainly used in exotic cars).
There are also rotary engines, electric engines, natural gas engines and hybrid (electric/gas) engines. Each of these has subcategories as in the most common piston engines listed above.
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