Why is there no sound insulation cotton in the trunk?
2 Answers
The trunk does not have sound insulation cotton because the placement of the insulation cotton is incorrect. Here are some explanations regarding why the trunk lacks sound insulation cotton: 1. Trunk: The ineffectiveness of sound-absorbing cotton may be due to its incorrect placement. If there is noise in the car, the first step is to identify the source of the noise, and then place the sound insulation cotton accordingly. 2. Engine: The engine generates noise during operation, primarily transmitted into the car through the front fenders, engine hood, firewall, exhaust pipe, etc. While driving, the car's chassis may vibrate, and road gravel can impact the chassis, which is a major source of road noise. The most direct way to eliminate noise is by using sound insulation cotton.
Actually, most car manufacturers choose not to install sound insulation cotton in the trunk to save costs and reduce weight during design. The material cost of sound insulation cotton is not low, and adding it to the car increases the overall weight. Even one kilogram can affect fuel consumption, which isn't cost-effective for family cars. Additionally, the trunk doesn't require as much quietness as the passenger cabin. Noise mainly comes from tires or the chassis, and the low position of the trunk means it has little impact, so manufacturers see no need to make it standard. Moreover, adding insulation might affect heat dissipation, especially near the exhaust system where heat could cause issues. It's cheaper and simpler for car owners to buy and install sound insulation materials themselves, so why should manufacturers include it as standard? It's the same logic as base-model cars having fewer features.
