The difference in engine life is that the turbonormalized engine is
producing more average power over its lifespan. The only time that a
normally aspirated engine pruduces rated power is on takeoff at sea level, a
rare occurance. The turbonormalized engine produces full power a lot of the
time and at higher altitudes where the engine doesn't cool as well.
Additionally the turbonormalized engine will run hotter since the inlet air
is always going to be hotter (even with an intercooler)..

Mike
MU-2



"Robert M. Gary" wrote in message
oups.com...
If differential pressure it now what wears out cylinders in turbo
engines are you implying that its over boosting? In the Mooney
community is mostly agreed that a 201 (non turbo) will give you twice
the cylinder life as a 231 (turbo). Other wear factors (heat, less air
over the cylinders) are the same for turbo-norm vs. regular turbo. The
only difference I can see is the "idiot" difference of accidently over
boosting.