Why does vehicles that operate on diesel vibrate so much?
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Diesel require higher pressures to explode then petrol so the engines have to be built with heavier pistons that can handle the pressure. But this means it takes higher forces to make the pistons change direction and it is these forces that cause the vibrations. Additionally this means diesel engines are usually slower then petrol engines so the vibrations are lower in frequency and lower frequency vibrations is harder to dampen. The overall result is that diesel engines creates more powerfull vibrations that is harder to dampen.
Because they’re usually much larger and generally more industrial/commercial so the lack of vibration for comfort of the driver isn’t seen as an issue.
Gasoline is more “explosion-y” and diesel is more “burn-y”, so if all things were equal the gas engines could actually cause more vibration. Take this with a grain of salt though it’s not my field.
It’s a combination of two factors;
1) Diesels tend to operate at lower RPMs where you’re more likely to encounter fundamental vibrational frequencies of the vehicle. Thus, you’re more likely to feel the vibration as a pulsing effect, rather than as a buzzing that you get in higher-RPM engines.
2) Because of how diesel engines works, the combustion event is more violent and energetic, and as a result the vibrations caused by combustion will be stronger.
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