EcoMotors is working on a futuristic diesel engine that's similar in concept to something Charles Lindbergh may have once used.

The company, which came out of stealth mode over the weekend, wants to bring what is called an opposed piston/opposed cylinder diesel engine to market. In ordinary engines, pistons pop up and down (or back and forth if laying down) inside an individual cylinder capped by a cylinder head. Gas is injected into the chamber and gets combusted by the action of the piston, among other factors.

In EcoMotors' engine, there is a double-length cylinder with a piston at each end. (There are no cylinder heads in-between.) A single-engine module consists of four pistons and two cylinders, said COO John Coletti. The pistons and cylinders are horizontal too, so car and engine manufacturers can stack them.

The unusual configuration results in several advantages. Mileage can be boosted by 40 percent to 50 percent, when a two-module engine is compared with a standard diesel. The engine also can be made 30 percent lighter. Because the engine modules are horizontal, cars can be more aerodynamic.

Coletti predicted that a 2.5-liter engine from his company will provide the same power as one of the 6.5-liter engines used by truck manufacturers today, but weigh 300 pounds less.