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Posted for "Micah Froese" <mfroese@hotmail.com>:

Mark Lally writes:

My whole point on the auto engines reliability was that these engines
could be run all day long at 2500 RPM at full MP and last well over 2000
hrs. I guess I should have said it that way the first time. The fact that
they can be turned at twice that RPM for short periods of time is a
testament of their reliability. If you want to compare apples to apples
here, we could use the Viper 488 cid engine as an example, one of the few
modern auto engines with a displacement approaching the GA engines. Who
would argue that this engine could be turned at 2500 RPM at 26 in MP for a
very loooong time?
<<<

It sure could be turned for a very long time, and that is what it would take to get off the ground. At 26 in. MP it would be way over that RPM. Take a look at the horsepower/RPM chart for that Viper 488 and see how much, or should I say little, power is being developed at that RPM. I admit for a car, car engines are absolutely marvelous, but in an aircraft they simply don't work as well. When it comes to reliability, weight, and cost, you won't be able to beat old C or L.

Micah Froese

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