Square Piston?

anyone ever heard of the Hossack engine?



Just came across this interesting little engine. Looks like this guy Norman who designed it put it in a pocket bike and it worked well enough... I bet with the right porting and carb and pipe setup this would be great on a moped

Re: Square Piston?

Mike McScoutington /

Super interesting

Re: Square Piston?

This is super cool

Re: Square Piston?

The action reminds me of a rotary engine

Re: Square Piston?

Do a hexagon next

Re: Square Piston?

♣Slew Foot♣ /

Honda experimented with that so did ford.

Re: Square Piston?

Tri-ped Dave O.D.B. /

I see an opportunity for rapid and excessive wear points where the piston corners pivot. It will work, and it will be more efficient, but it will self-destruct quickly.

Re: Square Piston?

whacky, probably fine for certain applications.

Honda tried to skirt the max of 4 cylinders rule in the 500 class in the 80s by making an oval piston so they could have 8 valves per cylinder. It did not work well.

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