The text explains the mechanical and thermodynamic principles of gasoline internal‑combustion engines, describing cycles, valves, pistons, crankshafts, balance and two‑cycle variants. It surveys supporting systems including carburetion and fuel feed, ignition methods and electrical and magneto systems, cooling and lubrication. Transmission and driveline chapters cover clutches, change‑speed mechanisms, differentials, shafts, and universal joints, while chassis and control topics address steering, brakes, springs, and suspension. Technical illustrations clarify component functions and assembly. An appendix focuses on low‑ and high‑tension magnetos and practical wiring and timing considerations for ignition systems.