OK... I'm just alittle outclassed here... I've got 9 glow engines...8 of which are in flyable airframes. The other is having a break after having taken a ... um... dirt dive.

I think is probably a variation on the, "How many is too many airplanes?, question so I'll answer it that way. You have too many engines when you have one more than the minimum amount required to for each airplane in your fleet plus spares plus engines for any future builds you have planned.

That pretty much leaves it wide open doesn't it?