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From: seifert@mako.UUCP (Snoopy)
Newsgroups: net.auto
Subject: Re: Diesel efficiency
Message-ID: <652@mako.UUCP>
Date: Tue, 19-Mar-85 23:44:01 EST
Article-I.D.: mako.652
Posted: Tue Mar 19 23:44:01 1985
Date-Received: Sat, 23-Mar-85 00:29:27 EST
References: <216@cmu-ri-leg.ARPA> <436@terak.UUCP> <1965@sdcc6.UUCP>
Reply-To: seifert@mako.UUCP (Snoopy)
Organization: The Daisy Hill Puppy Farm
Lines: 26
Summary: 


A big part of why diesels are more efficient under "normal"
operating conditions is because they don't have a throttle.
Takes power to suck that air past a throttle that's almost shut,
ya know?  Above a certain point, gas engines become more efficient.
Thus the quotes around "normal".  If crusing flat out on the
autobahn is your idea of normal, than a gas engine will be more
efficient.

This is the same reason that you get better gas mileage by accelerating
quickly up to crusing speed rather than creeping along.  The engine
(assuming a gas engine here) is running unthrottled, thus more efficiently.
Also you spend less time in the lower gears.

The above statements are based on research done by BMW. (which doesn't
imply that they agree with my muddy explaination of their work)


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