Technic Engine Cylinder with Bottom Slots (2850b)

The LEGO® Technic Engine Cylinder with Bottom Slots (2850b) is a specialised engine component designed to accommodate a moving piston in compatible Technic motor assemblies. Its cylindrical housing features openings at the base, providing clearance for the connecting rod as the crankshaft turns.

Engine Cylinder with Bottom Slots

Part 2850b is distinguished by its slotted lower section, making it suitable for building working piston mechanisms. When combined with compatible pistons, connecting rods and crankshaft components, it helps recreate the reciprocating motion found in internal combustion engines.

Product Features

• Part number: 2850b
• Part type: Technic Engine Cylinder
• Design: Cylindrical piston housing with bottom slots
• Function: Guides piston movement while providing clearance for connecting rod motion
• Applications: Technic engine assemblies, vehicle models and mechanical demonstrations

Build and Repair LEGO Technic Engines

Whether you're restoring an existing Technic vehicle or constructing a custom engine, this cylinder is useful for creating functional piston assemblies. Multiple cylinders can be incorporated into compatible inline or V-engine configurations, adding realistic mechanical movement to your models.

Find additional engine components and building elements in our LEGO® Technic parts and pieces collection.