wear on motors increases by the square os its not linear ; double the rpm is not half the life, it would be much less. Robert an diesels are much heavier built , much of this shows in price.
Steve Spence wrote: >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/ > > > > > [Non-text portions of this message have been removed] 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/
