Originally Posted by Nosram
Do any of you employ anthing special for tightening the flywheel? The collet and flywheel will move towards the front bearing when the nut is tightened. This will pull the 2 insides of the crankshaft ballraces towards each other. This will surely tend to bind them up. The situation will get even worse under temperature, because aluminum expands faster than the steel crank.
This must rob power from the motor?
You don't have to worry about it-normal engine is designed the way that if you pull cranck forward to front bearing it still will have clearance on the main bearing to avoid binding
See attached pic- I tryed to make it visible with 2 arrows pointing on front bearing with no clearance and main bearing with clearance. This is way how all engines designed (unless.....)
BTW this pic is fragment from real nitro engine design work.
