After reading some of R.S. Hoovers posts, it seems that the vw engine started out as being a 35 hp engine, and has been souped up by putting larger cylinders on it to the point where it has an output of 75-80 hp. The unforunate thing about it is however, that the cylinder heads are basically the same, meaning this hp can only be achieved until they reach their thermal limit, and that time can be as little as 5 minutes when climbing . To try to make this engine produce any more power would make matters be even worse. It could be done, but the useful life of the engine would be a matter of hours. So what we have here is an engine that can put out 80 hp for a few minutes to climb out, then lower the nose and throttle back and smile at 130-150 mph. If wanting more, then an engine that can put out 70 hp for an extended period of time is needed. That is the Rotax, perhaps the Jabiru, ect. At that point howerver, you really have to get the checkbook out. Great Plains used to sell water cooled heads, but don't anymore. They were heavier though, as well a water pump , radiator, ect. were required.
Do others on this site agree with my observations ? Thats how the situation looks to me at this time.
