The evaporation is exothermic, taking the heat away, like when you sweat. It releases energy into the atmosphere. Condensation is endothermic, the opposite so it removes energy from the atmosphere, by converting vapors to liquids, like your air conditioner in your car or home. Like your car or home, if there is more available energy (water vapor...denser in cold weather) to endothermically convert to condensate, then the exothermic release (vapor or energy back into the atmosphere) will be greater. I think that the endothermic process (creating condensate) is increased when there is a large difference in temperature...which is why some air conditioners are more effective than others in removing moisture for example. So no, all things being equal (available energy) a V4 does not necessarily produce more condensate. A larger surface that promotes condensation (a small soda can condenses less energy than an otherwise equal large soda can) produces more available exothermic energy for conversion to vapor. So similarly a larger muffler could produce the same results as the soda can example. A science lesson broke out at the motorcycle show I guess!
