With its oval piston engine incorporating eight valves and two connecting rods per cylinder, plus an aluminum semi-monococque frame complete with an inverted front fork, the machine surprised everyone with its daringly innovative technologies.

The Honda NR (New Racing) is a V-four motorcycle series started by Honda in 1979 with the 500cc NR500 Grand Prix racer which used oval pistons. [1] This was followed during the 1980s by a 750cc endurance racer version known as the NR750 .

2022年5月24日 · In 2022, Honda is still the only manufacturer to try making an oval piston engine work. Here's how and why it attempted such unique engineering back in the day.

2025年2月12日 · The Honda NR750 was a superbike ahead of its time. Featuring oval pistons, 32 valves, and an 8-spark plug system, this V4 engine delivered V8-like performance in a compact package. Though it never became mainstream, it remains …

2025年3月18日 · Ferrari isn’t the first to try its hand at oval-shaped pistons. Honda developed a four-stroke motorbike engine back in 1979 to make a return to the World Motorcycle GP series with the NR500. However, Honda engineer Toshimitsu Yoshimura said: “When I look back at it, I’m not sure if we were experimenting with cutting-edge technologies or ...

2022年6月6日 · With an oval piston, there are a lot of challenges around sealing, friction, piston stability, and much more. They started with a single-cylinder two-valve oval piston engine and eventually got that work, and as development continued they eventually increased up to the planned eight valves per cylinder.

2021年7月2日 · Honda has its own compromised engine which was an abject failure, but ended up being kind of a triumph anyway: the oval piston engine. That engine was fitted to one of Honda's most unsuccessful...

2013年5月16日 · What it came up with was the NR500, a machine with a number of innovations, not least of which was a remarkable engine equipped with ‘oval’ pistons. The engine was a V4, which was unremarkable, but it had eight con rods, eight spark plugs and 32 valves, as we might expect in a four-stroke engine with twice the number of cylinders.

2023年9月25日 · Honda Motorcycle Oval Piston. It was in the late 1970s that Honda first introduced its oval piston concept. They were seeking to break the barriers set by conventional circular pistons and create a motorcycle engine that could reach higher revs without sacrificing reliability or efficiency.

2019年1月1日 · Unlike its racing cousins that had straight-sided oval pistons, this bike used elliptical pistons with curved long sides. A detail view of the NR and the words “Oval Piston” that make it so special