Is the small displacement 2-stroke petrol engine dead because its undesirable emissions can never be reduced?

Well they said 4-cycle engines could never be made as clean as they've been made.

2-cycles, so far, don't have an oiling system. Since the fuel goes through the crankcase for compression, they went "hey let's combine the oil with the fuel".

The only way I can think to make that clean is change the type of fuel and/or oil. For instance I've heard claims that "B100" 100% biodiesel makes a dandy 2-cycle oil, which is plausible to me since the stuff is an extremely good lubricant.

So imagine a 2-cycle diesel (think EMD) that uses crankcase compression and runs B100 biodiesel. No worries on someone running regular diesel, since it has lousy lubricity and would destroy the engine.

My favorite 2-cycle is these antique engines with truck-sized pistons and very low RPMs, think Lister but 2-cycle gas. They use 11:1 or 16:1 mix ratio, and oh my they smoke!

http://motorcar.winkworth.us/engines/engines_index...

As far as modern uses of 2-cycles, well, I can't say I'll miss the most common uses of them. Gas scooters are just stupid, since electrics are more reliable and can be taken on the bus/train. Leaf blowers, almost always used within cord distance of an electrical outlet.

on a 2 cycle, the petrol/oil mix goes through crankcase not for compression, but to lubricate the bottom end then up a side cylnder and sucked in through the pistons cycle, when piston traaveling down it lubricates the cylnder then its compressed and ingnited in one stroke,

they still make aprillia 2-strokes

It's pretty much dead for on road motor vehicles but certainly not for off road bikes, chain saws, lawnmowers, weed eaters, etc.

for the states they're dead in the water

yep.

it`s dead!

too bad, too!!

burns oil. need i say more?