On Sat, 4 Mar 2006 13:38:34 -0600 "OK Don" <[EMAIL PROTECTED]> wrote:
> > If you're using the entire engine and tranny, you could use the cruise > > control to do the work for you. The only problem might be that the > > cruise control won't lock in at such a low speed. Guesstimiating: > > > > 1200 RPM at engine / 3.5 differential ratio = 343 RPM at wheels > > > > 23" diameter tires => 6 foot circumference > > > > 343 RPM x 6 feet/rev = 2058 feet/minute = 23.4 MPH > > > > IIRC, the cruise control won't engage below 25 - 30 MPH. > > > So, if you ran the engine at 2500 pm, it would = 48.75 mph., within > the cruise control range. > Couple the gen head to the axel - get the engine into it's > torque/power range. Yes, the numbers above are wrong for driving a > 1200 rpm gen head. > Where can we get the torque/hp/rpm curves for different MB Diesel > engines? Aye, there's the rub! I did a lot of guesstimating when I built my propane-fired Chevette generator. The available information suggested that it might have a little difficulty belt driving my 4 kWe generator at 7000' elevation. (For lack of better information, I had guessed a linear drop of torque from the maximum torque RPM.) Such was not the case. I just had to crank up the idle screw a little and it had no problems running at 1700 RPM. When I set it up again, I really should get a larger pulley for the engine shaft so the engine can run even slower. Or maybe mount the larger generator I have (120/240 single-phase at 104.5 A or 120/208 3-phase at 104.5 A per phase). Craig
