Hello,

I am digging up this old thread because I got myself a .91 MVVS and want to ask some questions.

The intention is to install the engine into a 1.80 m pattern plane that I built. The plane with the engine (no fuel) and electronics weights 3900g. The engine was bought broken, with no carb, broken big bearing, broken cylinder (ingested a ball from the bearing). I bought a new piston - cylinder assembly from Pe in Holland and changed the bearings with new SKF explorer series. I adapted a 9300 Perry carb (after all, the MVVS is a late 80's HB Grand Prix design) and turned the exhaust to the rear. I have a lite Bolly CF tuned pipe intended for the mid 10K's on the .61 engines.

I don't want high revs on this engine but as it has a stroke 1 mm longer than the OS .91 I want to use a 15x10 APC and dreaming of 8700 - 8900 rpm , or 9800 - 9900 rpm on a 15x8 APC. My usual fuel is Tornado 5% (from year 2010 has 14% P2000 synthetic oil 2.5% castor) in which I add another 3% high quality castor oil.

1. Can the engine turn a 15x10 prop ? I mean will it detonate / bend the conrod / damage itself ?

2. Can the engine get to the power band (top of the torque curve) with the 15x10 prop , or it will just stay below in the fast idle at 6 - 7k ?

3. What glow plug should I use to prevent detonation ? (I have acces to OS and Rossi plugs)


Thank you very much !