The Namikoshi concept engine weighs in at roughly 90 kg (198 lb), has a cubic capacity of 1,500 cc and measures approximately 800 mm (31.5 in) wide by 500 mm (19.7 in) deep and 250 mm (9.8 in) tall.

New 4-in-1-Piston Engine Concept to Rival Hybrids. Published: 22 Oct 2014, 12:37 UTC • By: Gabriel Brindusescu. 5 photos. Photo: screenshot from Youtube.

Images by 4 Piston Racing If you're looking to go full tilt on your next K-series build, ... alcohol drag race engines, the 4 Piston's billet head is designed to increase power beyond 11,000 rpm.

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.

Their X-mini engine weighs just 4 pounds and has three moving parts, and yet can produce 3 horsepower, enough to replace the default 40-pound piston engine that normally powers the go-kart.

Together the three recipients will invest another $4 million to develop a 3-cylinder, 3-liter opposed-piston gasoline compression engine that could improve fuel efficiency by 50% or more on large ...