"Thomas Borchert" wrote in message
...
Big,

We've had aluminum auto engines without liners and as I recall they
had a pretty high cylinder failure rate?


Can you explain further? Are the engine blocks aluminum on the
Bombardiers? That's quite common in the auto industry, isn't it? Also,
do you have the feeling anything could be much worse with regard to
premature cylinder problems than current TCM/Lycoming stuff?

--
Thomas Borchert (EDDH)


They appear to be coated aluminum cylinders. The problem that I see is that
the engines run up to 6000 rpm, and are geared 3:1. This makes for a lot of
piston (wear) strokes, and also the added possibility of gearbox problems.
The FADEC engine controls eliminate some control complexity, but more
problems seem folded back in with the liquid cooling.

I don't see a lot of folks standing in line to replace their current engines
until someone *else* runs a few to TBO and publishes cost and performance
analysis.

I think everyone is waiting for a bulletproof JP fueled diesel.