I don't know who Cuyuna is but I have to tell you a light weight2 stroke style 6-71 with an overhead cam (high reving) and all the fancy electronics you guys talk about, roots blower with a clutch for low end power and that could be a winner - although probably not teir 3 compliant it would get the job done.
If you were to build from scratch that would be the great marine go-fast diesel????
At our OSNA factory I have 3 machining centers that do protype work from April to June as orders are non-existant for new product.
How hard to make one from the ground-up? Use 6-71 liners make a modular block use like a 4-71 crank, lightr the counters, cut the main and rod journals down in dia, re-harden and grind, make new rods - the head would be a problem to make with water cooling, the block is easy as water is just at the top of the liner, just make a hollowed out top section so the block is 3 peices in height from top to bottom. Center section being the air ports.
Another crazy thought (strictly a test stand engine for theory only), if we took a little 4 bangers gas engine, dual overhead cams, we could in theory use 2 exhaust cams and have both sets of valves flow exhaust - right? Change the pulleys and turn the cams at crank speed.
Could we punch through the block right into the cylinder with nipples and use that to inject our intake air into the cylinder and have a 2 stoke now?
We could machine injectors into the spark plug holes with common rail we don't need high pressure timed pumps right?
I understand that nothing here would be optimal but I think it could prove a platform to develope off of? Low unit volume off-road (race) engines can get away with teir 3 still, correct?