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. > Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/