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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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