Most/many tractors have been independently tested for power and fuel efficiency, google Nebraska Tractor Tests for actual data.
For example, lets consider an engine similar to your Model T but a little more modern, compression was 6.5:1.....wow. The 8N Ford was produced from 1948 to 1952 and was tested reference, Nebraska Tractor Test #443. From this, we see that during a 10 HR test operating at: 1749 RPM and 17.65 Drawbar HP, the fuel consumption was 1.74 Gal/HR. Fuel efficiency was 10.1 HP-HR/Gal, obtained by dividing the operating HP by the fuel consumption per hour. Assuming 17.65 HP at the rear wheels would drive your Model T at 60 MPH this engine could deliver 34.4 MPG (60 Miles/HR divided 1.74 Gal/HR).
Note: Since the energy content of diesel fuel is greater than that of gasoline on a volume basis, the HP-HR/Gal metric is a measurement of fuel efficiency and not engine efficiency. For engine efficiency the energy content difference between the fuels would need to be accounted for.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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