>>1861116All engines can be expensive to build and maintain. Because there is energy stored in fuel, it releases heat, if you make the power greater than the stresses on the materials are greater.
When you get to big engines, the large pieces heat up unevenly, and it becomes expensive to manufacture, and you have to manage the degradation. You can always run at higher power settings, but the engine won't last as long.
Spark plugs are standardized, mass-produced parts, compared to the rest , it takes nothing just to replace those.
>>1861116That's a diesel bomber engine. I read some speculation on that type of opposed piston engine, and it's just a meme.
