LEGO TECHNIC 4 CYLINDER AXIAL ENGINE | Created by Lego Technic Mastery https://bit.ly/2YLs8wj | By Beyond the Brick | Facebook
LEGO MOC Custom 4-cylinder engine for your Lego MOCs and models by ngotronghieu118 | Rebrickable - Build with 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
A turbocharged 4-cylinder engine I made, including an intercooler! : r/lego
Lego Technic 4 Cylinder Axial Engine Idea | + Building Instructions | Lego Technic Mastery - YouTube