Bottom line is that performance is lacking.

1. Weight. Heavier castings to handle the much larger compression and combustion pressure.

2. Noise regulations. Diesel combustion is loud. Would require water jacketing to muffle noise. Maybe more than already designed it to most.

3. Lack of compression braking unless a version of the "jake brake" is fitted. Jake brake adds another noise suppression need and some additional complexity.

4. Lower RPM generally because of the heavy parts used. Also less RPM range which forces transmission differences.


The Germans produced some diesel engined bombers during WWII but they were underpowered.

It could be done but.... not enough benefit to bother.