Joytopiaminds Retrol Steam Engine Model Kits, Mini V4 4-Cylinder Steam Engine Model Without Boiler for Boats/Cars, Physics Science Experiment Toys

⚙️【Compact 4-Cylinder Precision】Features four 8mm bore/stroke cylinders with Walschaerts valve gear for realistic steam operation. Optimized for 3kg/cm² pressure and 50-120℃ temperature (boiler not included) 【Durable Metal Craftsmanship】Polished stainless steel and brass construction (180g) ensures smooth operation. Bearings on both ends of the crankshaft reduce friction for higher efficiency 【DIY-Ready Integration】Connect via φ4mm copper pipe to a compatible boiler (self-sourced). Includes screw-cap lubricator for easy maintenance-ideal for model ships, cars, or small generators 【Hands-On STEM Learning】Demonstrates thermodynamics and mechanical principles. Perfect for educators or hobbyists aged 16+ to explore steam power conversion and industrial history 【Collector’s Display Piece】Palm-sized design (9x8.5x7cm) with retro aesthetics. A functional decor item for desks or workshops, packaged in a gift-ready box, Manufacturer: Joytopiaminds