Also, you get a bump in efficiency, because you do not have to throttle a engine, you can burn super lean, since the diesel burns and lights the dispersed charge of natural gas, a mixture that probably would not otherwise burn.
Most of our car engines, unless you have one that has a throttle-less direct injection system, lose a gob-smack of energy because the engine is continuously pulling againt the artificial vacuum.
Weird, a little research on google, indicates that natural gas doesn’t like spark ignition at a compression ratio above 11.5:1.
I would not have guessed that..