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Isn't diesel also 4 stroke? I know it has no spark plugs for ignition and there are differences but the main principals would be the same.

Usually, but not always.

I'd bet most people in the US over ~20 or so have heard the sound of, or ridden in, a vehicle with a 2-stroke diesel:

That one, the 6V92TA, does the 'TA' imply it's Turbo Aspirated?

Those things sound amazing. And oh so dirty!