LEGO Technic - Upgrade Kit for Engine Motor Gear (Piston,Crank Shaft)- new parts | eBay
LEGO IDEAS - Educational Piston Engine model diesel or gas
LEGO Pneumatic Pump (Old Style) 48mm with Black Piston (4 Studs Long) and Spring (4701) | Brick Owl - LEGO Marketplace
LEGO MOC Piston engine inline four by AKM-Sky | Rebrickable - Build with LEGO
4x Lego Technic Motor Piston Bright Orange Connecting Rod Alt-Hell Grey 2852 4059632070192 | eBay
46pcs Technical Linear Actuator Pro Kit Cylinder Piston Power Functions Robot Car Gear Axle Set Compatible with Lego 61904 92693|Model Building Kits| - AliExpress