I figure that if anyone REALY cares, theres prolly a few question marks as to how you dyno a engine that is about the size of your fist.
Heres what i know....
A 18 tooth clutch bell is mounted to the engine. These are usually RRP HD steel(toughest you can buy) equiped with the clutch shoes of your choice (MIP 4N1 for me). Now the engine is mounted to a stand to mesh up with a 62 tooth spur gear... also usally RRP HD steel(also tough). The engine mount is then shimmed with .005" washers untill the mesh is "paper tight".
So wtf is "paper tight"? This is how racers mesh there gears to work with chassis flex. You basicly put a sheet of paper between the spur gear and clutch bell, and then slide your engine back and forth on its mounts to get the proper mesh. The paper between the gears keeps you from grinding them together and melting them (stock ones are thermoplastic). Some cars like the Losi GTX, dont have sliding mounts and are restricted to certian gear sets.
After its mounted i dunno how it works. Some unknown load is placed on them and then theyre spun up but after that i dont know.
I dont know if its relivant, but the fuel i ued was Wild Cat 60%... never really liked Blue Thunder or Odonnel.