Johnkpap,

If I did own myself these engines I would not have start this thread.
Simple try both engines in the plane.

I use an OS Max 61 FX and MVVS 10 CCM for my Taurus and I am only interested in what they are doing in the plane.
They both fit in same position just as yours. Change them cost me less then an hour.

If someone would sell you one of these engines and give you the possibility to test them on the bench, I would have start this thread.
Disassemble I would do after testing in the plane and maybe only an engine that disappoints me.
If someone is interested in the internal parts of your engine, then I wonder what you do after buing a new car?

Most interesting for me in this stage is fuel consumption in midrange because it is depending of carb characteristics, and pipe pressure.

RPM's on the bench doesn't tell me much. Normally you adjust the pipe length during flight so it is in resonace on full power (vertical!)
So you prevent the pipe drops out of his resonance curve on the moment you want full power.
The propeller is the power consumer on that moment.
In horizontal flight the pipe will normally be "too long"!
(And on the test bench?)


Because we talk about classic pattern flying most often we use midrange, (Normally, LOL)
When you are interested in max RPM, I can show you other results, see picture, my pumped Webra Speed 10 CCM, with Sonex pipe after a speed attempt + 150 mph..

Success, Cees