I had an ASP 91 in my VF Extra. Could never get it to run right. Seemed like it had an old 2 barrel Rochester carb on it that would hang up on high idle all the time. Deadstickes whenever it felt like it too. I was bummed because I was trying to prove a point to th "OS or nothing" members at my club field. Just because I'd look silly if I went out and replaced the ASP with an OS, I hunted around for options. The MVVS struck my fancy, but it wasn't available in Canada. When I called MVVS in Europe, it turned out they were looking for a Canadian importer/distrubutor. To make a long stiory short, now I don't have an MVVS 91, I haev a big box of them!

The MVVS .91 is designed to be a torque monster, reccomeded props run right up to 15x10. My ASP struggled to spin a 14x6 at 10K. The MVVS should easily pull a 15x8 at 10K static according to the factory. The snow has been flying here so I haven't flown my Extra with the new engine, but the build quality is much better than the ASP. I would say they are nicer that even the OS. The MVVS .91 is not ringed. Bisson Custom Mufflers stocks Pitts mufflers for them.

If you are not in a rush to get your plane in the air, I will be posting results if we get a day or two of warmer weather here.