Haynes Build Your Own Internal Combustion Engine

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DISCOVERY KIDS DIY Toy Model Engine Kit, Mechanic Four Cycle Internal Combustion Assembly Construction, Comes W/Valves, Cylinders, Hardware & Much More, Encourages STEM Creativity/Critical Thinking

Trends UK Build Your Own V-Twin Motorcycle Engine

Car Science: An Under-the-Hood, Behind-the-Dash Look at How Cars Work

Haynes Build Your Own Jet Engine Fully Working Model Kit

Playz V8 Combustion Engine Model Building Kit STEM Hobby Toy for Kids & Adults with DIY Guide & Realistic Parts Including Timing Belt, Cylinder Heads, Spark Plugs, Pistons, Ignition Wires, and More

OWI Hydraulic Arm Edge Kit

Smithsonian Motor-Works

Hawk 1/6 scale Dodge SRT-8 diecast engine kit

DjuiinoStar Hot Air Stirling Engine Assembly Kit: Spend 30 Minutes to Build Your Own Stirling Engine