JMBricklayer 3-in-1 Mini Engine Building Block for Adults to Build, V6 B4 L4 Model that Runs, STEM Mechanical Brick Toy, Home Office Decor, Collectible Technical Gifts 14+ Car Lovers

【JMBricklayer 3-in-1 Mini Engine Model Set 60023】Build three complete engines from one set — a V6, an Inline-4 (L4), and a Boxer-4 (B4). Each engine is assembled separately, allowing you to explore and compare different cylinder layouts and mechanical structures while experiencing the unique engineering character of each configuration. 【Compare Three Classic Engine Layouts】Discover how different engines work by building three distinct configurations: the compact Inline-4, the smooth V6, and the low-center-of-gravity Boxer-4. Each layout demonstrates unique mechanical characteristics, making the building process both educational and deeply engaging. 【Manual Crank – See the Motion】No motor needed. This model uses a hand-crank mechanism to activate the pistons and crankshaft. Turn the crank and watch the synchronized piston movement in action — a clear, hands-on way to understand how internal engine parts work together. 【Beginner-Friendly & Rewarding Build】With 711 precision pieces, this set offers a satisfying yet accessible challenge for teens and adults. The step-by-step assembly process helps builders learn basic engine structures while enjoying a hands-on project that rewards patience and focus. 【Compact Size for Display & Learning】Each finished engine measures about 4 × 4 × 3 inches (10 × 10 × 7.6 cm) — perfect for desks, bookshelves, classrooms, or workbenches. These mini engine models combine mechanical curiosity with a clean, display-friendly design, offering everyday inspiration for car lovers and STEM learners.