Most modern (say, made in the last 20 or 30 years ) electric motors are able to take at least a 10% variation in power, and in hz- Hz being the 50 cycles versus 60 cycles.
So an appliance that was actually a 220v, 60hz motor, should have no problem running on the power here. The motor may run slightly slower than in the USA, but that can be advantageous, as it doesnt get as hot.
As far as things like appliances, though, it depends if they have internal wiring that is 110 volts.
Ghost is a bit confused- he is correct, that his machine needed converting, but in the US, anyway, "2 cycle" refers to a very obscure and obsolete type of power that is only used in the Syracuse/Buffalo Ny area, and in Philly.
What he means is that, in the USA, 220 volts is usually derived from TWO hot, 110 volt wires. Hence, the 220 part of the washer gets its power from BOTH, and the 110 volt part- the electronic transformer, the lights, etc- get their power from ONE of the wires.
Here, in Argentina, we have ONE wire that is 220volts.
So, without a transformer, you cant split it and get 110.
Some brands of appliance use a small internal transformer to take the 110 down to 24 volts or so for the controls- and, theoretically, you could switch this for a 220 to 24 volt transformer- but it takes somebody who really knows what they are doing. Others use 110 more thru the appliance, and the conversion is even more complicated.
Could a really good electronics technician do this? of course. But the standard electrician here may have more trouble.
So, sure- its possible. But its gonna be a lot easier just to buy an expensive, high quality unit here- they are hard to find, but LG, and similar korean stuff is out there, particularly on mercado libre.