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Both diesel and kerosene have very low octane numbers. I think in order to run a spark-ignition without detonation you would need to lower the compression ratio down to the tractor level, reducing the efficiency down below the gasoline fueled version. You have things like exhaust valves and spark plug electrodes that get way hotter than just the temperature of compressed air and will pre-ignite and/or detonate and destroy your motor in short order.
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