. The tach is supposed to be above 7,800 all of the time, as there is no

 > >power under that. Sometimes I catch him under reving and we have to

talk.

 > > > Lynn E. Hanover

 >   I think this statement from Lynn makes the point that auto racing
 > actually may be a reasonable basis for determining durability of the 13B
in
 > an aircraft application when the desired output is about 180HP @ 6000
 > RPM.  I'd guess if this engine peaks at 245HP @ 9450 its at or above 180
 > when under load for a pretty fair amount of the time during a race. Its
not
 > at 100% power but its above 180 for far longer than the fraction of a
 > second thats been pointed out previously. Isnt that what counts? At least
 > for those of us who would be satisfied with that amount of power.  :-)
 >
 > Mike Wills

If you keep the temps in the green, I see no reason to think that a 13B
wouldn't go 1000 hours. For a turbo, I would look inside at 50 hours, and if
nothing is wrong, I would go to 500 hours. For most people that is a number
of years of flying. At 6,000 RPMs the bearing loads are minimal. We have lost
some bearings but that little red bar seems to be stuck well above the 10,000
mark. The rev chips can't save it in a down shift. Lynn E. Hanover

 
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