A turbocharged 4-cylinder engine I made, including an intercooler! : r/lego
Amazon.com: Yanscian 6 Cylinder L6 Engine Model Building kit Set Hobby DIY STEM Toy for Kids & Adults with Guide 500+ Pieces, Toy Building Set, Build Your own Engine That Runs, Mini
Technicopedia: 858
LEGO IDEAS - Inline 4 Engine
LEGO IDEAS - Honda B18C Model
Exploring Piston Engine Design With LEGO | Hackaday