Combustion

MindBlown DIY Model Engine Kit – Mechanic Four Cycle Internal Combustion Assembly Construction, Comes W/Valves, Cylinders, Hardware & Much More

PHYNEDI MAD Dynamic V8 Internal Combustion Engine Model for AX90104 SCX10II Capra VS4-10 Pro/Ultra Model Car Vehicle, Assembly Exquisite Physics Collection Stem Toy, KIT Version (Without Bracket)

XSHION TOYAN FS-L200W 7cc Inline Two-Cylinder Four-Stroke Engine Model, Water-Cooled Methanol Engine Internal Combustion Engine Model for 1/8 1/10 1/14 RC Car Ship Model

Playz Flat 6 Model Engine Building Kit – 320+ Pieces Revved-Up Internal V8 Style Combustion to Build Your Own Mini Engine That Works – DIY STEM Project & Gift for Kids, Teens, & Hobby Kit for Adults