On Mar 14, 2005, at 10:04 AM, rickschrameck wrote:

 A Supercharger and a Turbocharger use about the same HP from the engine to
maintain Sea level HP to about 17,000.


Now, measure that at any partial throttle condition and you will find that they do not siphon the same HP.  The belt-driven systems experience the same problems as the gear-driven superchargers do in radials.  They drain a lot of HP and this drain is worse than the exhaust systems at any partial throttle position.  I operate two gear-driven supercharged engines and one exhaust-driven supercharged engine.  I have looked at the *measured* effects.

I do not sell either system.

I find the exhaust-driven system to be more efficient and have not found it to have any untoward operational or maintenance issues.

YMMV.

Walter