“Weight is one. I think the article said it weighs around 1/3 of the Honda GX-240 engine used in lawn equipment and has higher output also. “
They fake the numbers. I also don’t believe their 42% efficiency claim.
I don’t either. There’s got to be a ton of friction loss from the the ring and pinion. And since it’s a ring and pinion, you’ve got to run a much heavier lubricant, which can’t be good for what I’m assuming are plain bearings on the con rods.