Hi there all

Just thinking for many days to ask about ABC and Ringed engines. I read on a website that ABC engines are more powerful and good than Ringed engines. This is what it says

Model airplane engines many times come in ringed and ABC versions. The ringed engine has a piston ring to create the piston-cylinder seal that is needed for compression. An ABC engine has no ring. The ABC stands for Aluminum, Brass, Chrome. It means the engine has an aluminum piston that is running inside of a Brass cylinder that is chrome plated. The ABC engine has the potential for more power and requires very little break-in. It is, however, less tolerant of dirt or dust that may be ingested by the engine.

I'd like to know that ABC or Ringed engines are both in 2 stroke and 4 stroke, second which engines are to be bought ABC or Ringed and which are more long lasting rubust and sturdy?

Second Question, Engines with bearings are more reliable and long lasting than engines with bushings?

Thanks for your input

Mody