engine/turbo theory question

[c a l i b a n]

	i was discussing turbocharges with a friend - well,
	explaning them, actually.  he raised a question that
	i never thought of:

	is there any overall power loss that comes from the
	pressure (backpressure?) required to turn the turbo?


-- 
 rocky mullin - chaotic good
 http://caliban.sf.ca.us/
 two strokes are faster than four!
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 "i'm not very sharp- i just get things done"  -- steve lerner