Why Are 5.9 Cummins So Loud?

The 5.9 Cummins is notoriously noisy, especially the truck version. The problem is with the engine block. These engines are made by two manufacturers, TUPY in Brazil and Teskid in Mexico. However, there are ways to decrease noise levels. Here are three options. The first option is to get a new engine. This option is the most expensive, but it will help reduce noise.

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Pilot injection reduces noise

Pilot injection is a method used to reduce noise in the 5.9 Cummins engine. It helps the main combustion event occur without triggering excessive noise. In general, common-rail engines are quieter than mechanical engines. The five-hole nozzle on the later 5.9 models offers a narrower spray pattern and reduces noise. In addition, the three post-injection fuel events decrease harmful emissions.

Pilot injection reduces noise by reducing the lag between the main and pilot combustion events. Because the amount of fuel injected is small, the pilot combustion has the same characteristics as the main combustion event. It also increases the temperature in the cylinder and decreases the time between main combustion and injection. This results in more uniform combustion.

The timing of the pilot injection pulse is critical to reducing noise. It must be very short. The resulting small scale combustion does not cause noticeable clatter and can even reduce cold start warm up noise. In addition to reducing noise, it reduces vibration.

Pilot injection reduces engine knock and NOx emissions by reducing the duration of combustion. It also reduces combustion pressure spike and has a positive impact on fuel efficiency.

Main combustion event reduces noise

Cummins engineers have taken steps to reduce noise and emissions by modifying the combustion process. By improving the timing of the pilot injection pulse, they can reduce noise and particulate emissions during the main combustion event. The timing also reduces vibrations and cold start warm-up noise.

Main combustion event helps reduce noise

The main combustion event is an important part of 5.9 Cummins’s engine design. This event takes place at the end of the power stroke, when the piston reaches TDC. It should be virtually noiseless, with no pinging or droning.