News for hackers. Stuff that matters.

A comment on Keeping Rotary Alive: Mazda's Rotary Engine in the Age of the Electric Car. Parent comment

Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by TylerE on Monday April 01, 2024 @11:06AM (#39894914)
That hasn't been true for a long time. Two strokes barely produce more power per CC, and the emissions are not compatible with any modern standards. They're used in yard tools becuase they're CHEAP.
[ Parent | on HN ]
Re:Keeping Rotary Alive: Mazda's Rotary Engine in the Age of... by seabrookmx on Monday April 01, 2024 @06:17PM (#39900054)
Power per CC is the wrong way of looking at it. A 250cc displacement two stroke is still much lighter and more compact than a 250cc four stroke engine so you want to focus on power per weight.

The cost argument probably is the main driver for yard tools (Honda makes a great 4 stroke string trimmer for instance) but Endurocross bikes, trials bikes, and mountain snowmobiles especially still use two strokes for the power to weight advantage. The BRP snow machines even have direct injection which really helps emissions, though obviously they still have total loss lubrication so they're dirtier than a four stroke.

[ Parent | on HN ]