Propane and Natural gas are both excellent fuels for engines. Both have higher octane than gasoline and would allow for very high compression and therefore efficient engines. In addition natural gas is the lowest in CO2 emissions of the fossil fuels. Propane has seen periods of popularity in tractors etc. however natural gas has not. The deal breaker for natural gas is that it remains a gas even at very high pressures, propane is easily converted to liquid. For example, at an ambient temperature of 100 degrees natural gas remains a gas 5000 psi, propane is a liquid and 190 psi at this temperature. Even at 5000 psi a tank of natural gas contains much less energy than a similar tank of liquid fuel, limiting the range or run time between fill ups. In addition equipment to handle the high pressures is costly. That's it in a nut shell.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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