your point about longevity is the point I'm trying to make. the original poster wanted a full time generator. 3600 rpm gas engines will not hold up to that duty cycle. 1800 rpm diesel's will.
Steve Spence Subscribe to the Renewable Energy Newsletter & Discussion Boards. Read about Sustainable Technology: http://www.green-trust.org [EMAIL PROTECTED] ----- Original Message ----- From: "Paul Schwartz" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, March 07, 2003 11:59 AM Subject: Re: [biofuel] diesel > 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: <[email protected]> > 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/ > > > 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/
