ORIGINAL: Paul M
I hate to beat this horse, but who is building an 8 HP Zen??? I want one[:-]
8hp is a big claim for a 26cc piston port Zen engine. I don't believe it--at all. I don't think QD claims that much for the good Mitch motors (of equal size). I would be willing to bet anybody money that no G260, piston port naturally aspriated engine running on gas will ever hit 8hp. The best pipe on a stock engine makes about 4hp (may be a little more)---and your not going to double that power with added porting using the cast Zen cylinder. The best I have ever seen was 7.2hp, but that was a billet cylinder, with much more advanced porting than is possible with the Zen cylinders, and using a pipe that was designed by a student of Dr. Gordon Blair. The engines I am talking about were prototypes, and never made it to production. 6hp is about the max you can get out of a G260 IMO.
Sorry Drag