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"""
Bit of a subject change, if you're up for it--I
wanted to get your
feedback
on alternative engines.
Specifically, it seems to me that the GM
LS1/LS2/LS6/LS7 engines are
real candidates for high performance aircraft,
say
Legacy/LIV/LIVP.
"""
I spent 15
years at GM as a Powertrain Engineer so I am a bit biased,
however
the 350 CID
engines are to small for our high performance aircraft. If you
run
them at 6000
RPM so they can make 300 + HP, GM will expect them to last
about 200 hrs.
The GMC durability test runs an engine from peak torque to
peak
HP at WOT for
200 hrs. Most engines survive on straight viscosity oil. Multi
viscosity
oil is another
story. Making 350 to 400 HP at 2700 RPM from a 550 CID
engine is
pretty good. To put it in perspective, if an engine makes 400 HP at
2700
RPM and could
make that same torque at 6000 RPM, it would be making
almost 890 HP.
To run from 75% power to WOT for 2000 hrs at this stress
level is pretty
good. However, I believe if the aircraft engines had good
electronic
controls, the mechanical durability and performance would
only
improve. Note,
I said mechanical durability....I'm a mechanical engineer....I
guess
the electrical
engineers have to step up and do their thing.
Craig
Berland
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