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Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

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Old 08-15-2007, 06:08 AM   #11
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Originally Posted by omgwtfbyobbq View Post
IME just about any car built from the 90s on has suboptimal gearing for efficiently cruising at the speed limit.
Definitely true for my car. I think that the manufacturers are trying to keep revs high at cruise so that people don't have to downshift to go up a hill pulling a trailer at 70 mph.
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Old 08-15-2007, 08:10 AM   #12
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Edit-Well.. yeah, a bigger engine versus a smaller at the same output is a given. What about the same sized engine at different levels of torque versus speed?
Intuitively, given two identical engines - the one spinning faster would wear out first. I say intuitively as this can be seen in generators - fast spinning emergency generators (operating near 3600 rpm) aren't expected to go beyond 500 hours of use whereas long term utility generators (circa 1800rpm) can go well beyond that. I guess the same can be said for marine engines too.

Not sure if that answers the question -- but keep in mind I'm sharing anecdotal information, I don't claim to be an engine life expert

Another interesting tidbit of information would be the life expectancy of a motor cycle engine - one that lives in a high rev range. I'm curious what, if anything, is done to those engines to keep them reliable.
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