Being a newibe here, I don't really want to start a controversy, but . . .

Every engine has a graph showing horsepower generated per pound/kilogram of
fuel consumed.  When we say "fuel efficiency" we want to run the motor at
the rpms where the fuel is converted most efficiently.  The intended average
cruising speed of a car should be near this engine speed.

Slower revs might make the engine last a little longer, but it might consume
more fuel in the process. For fixed rpm applications like a generator the
engine should be designed to give its maximum horsepower per unit of
consumed fuel at the design rpm--this assumes proper design.

Honda built a piston engine that had incredible fuel efficiency, and ran on
25 octane fuel, but it's design rpms where about 25,000 rpm. It was about
the size of a teapot and generated about 25 horsepower.  Might not last too
long OTOH.

Small point, but as an engineer I like precision.

Paul

----- Original Message -----
From: "Steve Spence" <[EMAIL PROTECTED]>
To: <biofuel@yahoogroups.com>
Sent: Friday, March 07, 2003 8:07 AM
Subject: Re: [biofuel] diesel


> the point was you don't want a high speed diesel for long term use.
>
> the bigger, heavier diesels run at slower rpm's and are better suited for
> this application.
>





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