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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: net.auto.tech
Subject: Re: Re: Re: Turbos and superchargers
Message-ID: <778@kitty.UUCP>
Date: Sat, 1-Feb-86 23:42:03 EST
Article-I.D.: kitty.778
Posted: Sat Feb  1 23:42:03 1986
Date-Received: Fri, 7-Feb-86 08:19:31 EST
References: <715@decwrl.DEC.COM>
Organization: Recognition Research Corp., Clarence, NY
Lines: 29

> Turbochargers and superchargers do the same thing, they compress air to force
> more air/fuel mixture into the cylinders to get more power.  The basic
> difference in automotive language is where the devices get their power. 
> Turbochargers get their power from a turbine in the exhaust system, powered by
> exhaust pressure.  Superchargers (often called "blowers" by racing types) are
> belt-driven, like the alternator, water pump, etc.
> 
> Advantages to Turbochargers:
> 
> 1) Use "free" power (exhaust power)
> ...

	Nothing is "free" in this world...  The turbine motor which powers an
exhaust-driven turbocharger gets its power from the exhaust gases by paying
the price of increasing exhaust backpressure, thereby increasing engine load
and decreasing engine efficiency.  There is not a great deal of power (when
compared to total engine output) expended to run the turbine motor, but it
could be as much as several BMEHP at high rpm's.  The resulting power gain from
the turbocharger action more than justifies the power required to drive the
turbine motor.  The same thing is also true of a direct-coupled Roots-type
supercharger; the engine power required to operate this blower is more than
justified by the increased power gain.

==>  Larry Lippman @ Recognition Research Corp., Clarence, New York        <==
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