There’s more than meets the eye in High-Performance Air Filters. Airaid explains what goes into designing a High-Flow Air Intake System. Stephen KimWriterOct 22, 2013 See All 8 Photos ...

The air-cooled engine was the stuff of legend, powering the Porsche 911 and VW Beetle (the real Beetle, not the ersatz New Beetle) to enduring fame in automotive history. And then it was gone.

The U.S. Air Force is funding an aviation startup working on a combined cycle engine. Hermeus’s combined cycle engine can work like a regular turbofan or ramjet engine, reaching a speed of Mach 5.

This rotary air engine would also work well as a range extender for fleet vehicles with local routes. A rotary air engine is a great match for a generator, as they both spin and work best at ...