Two strokes don't generally have more compression than four strokes. Compression ratio is dictated by the fuel used most predominantly, so a gasoline engine is going to have between 7 and 12 to 1 compression regardless of the cycle used. Where in that range a given engine falls is determined by the desired output. Our glow engines run at between 12 and 14 to 1, somewhere between gasoline and diesel. Reason for that is methanol, the primary component of our fuel, has a much higher octane rating than gasoline, and if you can raise compression you can raise power.