If you’re looking for educational building toys that truly spark curiosity, the Haynes – Machine Works V8 Engine is a standout choice. This engineering kit combines hands-on model building with real mechanical insights, making it among the best building toys for 6 to 9 years (with some adult guidance).

This kit includes over 250 parts to build a working V8 engine replica. The transparent casing lets kids see pistons, crankshafts, and even illuminated spark plugs in motion. It features realistic engine sound effects and comes with a controller to start the model. The augmented reality (AR) app lets youngsters explore exploded views of engine parts and animations.

What makes it suitable as a toy to learn is its balance of challenge and fun. Although the recommended age is often higher, kids aged 6–9 can definitely benefit—especially when helping hands are around. The step-by-step manual mirrors Haynes style instructions, making it intuitive yet educational. As children assemble parts, they practice fine motor skills, patience, spatial reasoning, and following technical instructions.

More importantly, this is more than a toy. It’s a bridge into STEM concepts—how internal combustion engines work, how motion is converted to power, and how parts interact. Kids get to see and hear mechanics in action.

If your goal is to find a toy that’s not just fun but meaningful, combining real mechanics with play, the Haynes – Machine Works V8 Engine is a top pick in the world of educational building toys.