The $29.99 all-metal desktop Stirling engine kit is one of the simplest. It can be assembled in 15 minutes and is recommended for ages 14 and up. Also for $29.99 is the Exploring Kid Steam Engine Kit.
At the MotorTrend How-To section, you’ll learn how to perform the car improvements you want to do, thanks to DIY knowledge on how-to make an engine more powerful, improve a suspension ...