We may receive a commission on purchases made from links. Everyone knows Amazon. The online retailer is one of the largest markets in the world, earning itself a reputation for selling just about ...

The Nano Bee, created by engineer Ronald Valentine, is a diesel engine smaller than a quarter but powerful enough to to spin a model-plane propeller.

Three-cylinder diesel engines have not disappeared from the market, but they now occupy a narrower, more specialized corner of the powertrain world than they did a decade ago. They continue to be ...