Build a real working battery-powered 4-cylinder model engine with lights and sounds. Watch the spark plugs fire and the valves open and close. Learn how a real engine works and see how the pistons fire with the correct timing and watch the belts and fan turn. Now there are no more excuses - literally ANYONE can learn the ins and outs of a modern engine with the Motor-Works kit from the Smithsonian Institution. In fact, you can actually build a motor from the ground up, a fun, fascinating, step-by-step process, resulting in a real, working, 4-cylinder engine with absolutely authentic lights and sounds. So rev up your brain and prepare to learn things you never knew before about what goes on under the hood. Measures 10"L x 4"W x 8"H when fully assembled.