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From: Steve on 8 Mar 2010 10:15
Ashton Crusher wrote:
> On Wed, 03 Mar 2010 16:00:23 -0600, Steve<no(a)spam.thanks> wrote:
>
>> Pete C. wrote:
>>
>>>
>>> Look at aluminum aircraft and engines.
>>
>> Aircraft engines with their 2000 hour time between overhaul limits?
>>
>>
>> That's only 120,000 miles for a car engine at 60 mph overall average speed.
>>
>
> Not a fair comparison. The aircraft engines spend almost there entire
> lives between overhauls running between 70% to 100% of rated power.
> Most car engines spend 90% of their time running at about 15% power.
> And most aircraft engines are running just fine when they are
> overhauled, it's just that for safety they can't risk running on the
> tail end of the durability curve like you can in a car.


All true, except that I would argue that a fair percentage of pickup
truck diesels will spend their lives running at a large fraction of
rated power too. Not to the extent of an airplane (or worse- boat)
engine, but still much more than any car, or the same pickup used as a
commuter/HomeDepot runner. Lots of pickups really do get *worked* hard.


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