Posted for Walter Atkinson <walter@advancedpilot.com>:

 I'm with Greyhawk on this one.  If we built aircraft engines to the same
weight-tolerance-HP as car engines, you'd do a lot of taxiing and darn little
flying!  We'd never get airborne.  Look at the weight to HP ratio of the two
types of engines.
 
 Just because it's old technology, doesn't mean that there's been anything
made better!
 
 Walter