How do you know when something's a genius invention? For me, it’s when I see it and instantly go: why didn’t I think of that?

Unlike piston engines, Rotary engines don’t require valves to run. Here’s how rotary engines work and why some designs have incorporated valves.

The opposed-piston motor has been around for almost 100 years, but it's never been put into a land vehicle before, until now. Here's what you need to know.

The Achates Power opposed-piston engine I saw in the Calstart webinar was a heavy-duty diesel for use in 18-wheelers. The 10.6-liter three-cylinder (with six pistons) makes 400 hp at 1700 rpm and ...

Working with engine manufacturers worldwide, Achates Power is intent on bringing the opposed-piston engines to market. It is currently working on 2.7, 5, 10, 14, and 200L engines for different ...

After Chandler resident Mark McCoin lost his job in November, he created what he believes is a revolutionary engine. He said his "rotary opposed piston engine" is smaller and more fuel-efficient ...

The rotary engine could be on the verge of a revolution. California startup GoTek Energy has received a patent for a new type of motor – one that addresses some of the shortcomings of past ...

Rotary engines -- An article in Wednesday’s Highway 1 section about the Mazda rotary engine said the last generation of the Mazda RX-7 was produced from 1998 to 2002. Various versions of the car ...

LiquidPiston's Hyper-Efficient Engine: Turning the Rotary Inside Out A new spin on the internal combustion engine by startup LiquidPiston aims for a leap in efficiency from 20 percent to 50 percent.

The engine you see here has three opposed-piston engines in a chain, forming a triangle. This setup made 3,700 hp when turbocharged. A much simpler bank of six cylinders (12 pistons) could power ...

For a time, the Wankel rotary engine seemed like the future. In 1963, German automaker NSU—later absorbed into Audi—debuted the Wankel Spider, the first internal-combustion production car not ...

Last year Mazda confirmed plans to use a new rotary engine as a range-extender for a plug-in hybrid model. So if you put the two pieces of this puzzle together, we’re likely to see one of those ...