ORIGINAL: rcdude7
The zenoah is more expensive than any of the other weedie type engines in the 25cc class. It is also a good bit more powerful too. The boost port in the G-26 cylinder is what gives it such a advantage over the G-23 and other engines with tranfer ports only. I think it out run the toro by 1000 rpm give or take a little. I tached my box stock G-26 yesterday and got 8700 with a 17X8 prop.
The toro is a fine engine as long as you don't require power of the G-26
No question about the greater power of the Zenoah. What has me looking at the Toro conversion is the fact that for a sport flyer that doesn't need more than run of the mill power, the savings is worth it.
If I were looking at a competition plane, or an aggressive acrobat, I would be looking at top of the line engines.
For a more basic kind of flying I think a good conversion is appropriate technology.
BobbyG