I have just bought an MVVS 26 IFS for my BTE Flyin' King. Much more power than it needs, but I got a very good deal and couldn't resist. With this engine, the plane flies nicely at just 1/4 to 1/3 throttle (with 50% negative expo). I usually spend most of the time flying around at low rpm. The question is; will this hurt the engine in the long run?

Just tune the engine for the rpm band you desire to fly it in, and prop accordingly. It won't hurt the engine.

Thank you for the info, that is really good news! I'm using a Menz S 18x6 prop. The low end is set fairly lean, so there is no midrange gurgle (only at high idle). There is no hesitation when I hit the throttle. I must say that this engine runs incredibly smooth, considering that it has only run a few hours.

you will learn to love these engines as much as I do.[8D]

Pe, I already love it! Engines usually improve as they get fully run in, but I can't see how this engine could run any better than it already does. There is only one thing that bothers me: the conrod. With the extra head shims I ordered, and my "relaxed" flying style, I hope it will last quite a bit longer than 30 hours...

Where does this 30hrs on the conrod thing come in? I've got way more than that on mine and it's still runnin strong.

Jezmo,
This applies to pre-2008 engines, I don't know how old your engine is. The big end bearing doesn't seem to be strong enough, and it is recommended to check it after 30 hours. One or two extra head shims to lower the compression will make it last longer. The newer engines have a larger bearing.

Seems about all the engine companies have had some big end bearing issues. I've managed to have them fail in even the "exalted" name brands. Those things always get themselves addressed and corrected over a little bit of time. You'll like the MVVS for sure.