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That concept from Honda encourages me a bit, as I have 2 sets of 2 pistons firing together as a simultaneous 4 instead of just a twin. Just hope the big ends can ultimately take the increased load at higher revs.

Thanks for that. I believe it was fitted to German TWN and possibly Victoria motorcycles. It had some of it's porting advantages but maybe not the one of improved torque at low revs.

Thanks for this info. Double big ends make that bit easier. I've had to use a piggy back system for one, as there's no room to double them up like that. I wonder how many revs/min. it could do?

Not yet but....The porting here can be rather interesting as the overlap between the 2 pistons at BDC allows for them to be open longer and still open even when the exhaust port has become fully closed. Thus it means almost 100% of the incoming charge cannot get anywhere near it in exhaust...

They look good and must have been quite a challenge if based on a single cylinder engine for each one. If I could get a crankshaft from a B & S flat twin I'd maybe use it instead as 340cc may be too much for the 170 Victa twin crank. I've also made a matchbox sized, 4 chambered oiler on my 3D...

THANKS, I'LL TRY TO FIND IT. At present I'm making a mock-up of a flat four of 340ccs based on a Victa twin 170cc mower, boxer engine, using its crankshaft and pistons x 4, via my 3D printer making the plastic cylinders, heads, double con rods etc. It's slow work but interesting. If it turns out...

I'm thinking of making a 2 stroke engine with 4 stroke lubrication via splash with no use of crankcase induction, but with a 2, 3, or 4 vane type supercharger turning slower than the crank but timed to match the porting instead, to pulse charge the cylinder. Is this a possibility provided the...

Has anyone ever attempted to build a "split single engine" using the same principle as employed in a Daimler Puch 250cc SGS twin motorcycle engine?

Are there any 2 strokes with 4 stroke style lubrication?