Engine bonnet insulation
In many modern cars, attention is paid to insulating the bonnet and reducing engine noise. Older vehicles often do not have this. Another problem is that insulation material in cars ages over time (about 5 to 6 years). This happens especially at high temperatures, reducing its effectiveness. The result is noise pollution, which can be heard especially in the cabin. The noise penetrates through the bulkhead into the interior. Read how to solve this problem step by step.
Step 1: Remove the old hood insulation
In many cases, the firewall is not heavy enough, or gaps have formed in the current insulation. Therefore, it is essential to completely replace the existing insulation. Start by removing the old insulation from the firewall. Ensure the surface is thoroughly cleaned and grease-free before moving on to the next step.
Step 2: Apply new insulation to the firewall
On the clean surface, apply EASYdemp. This bitumen vibration-damping sheet is specifically designed for cars. In this case, it's not used to reduce vibrations but to provide sound insulation. For optimal sound insulation, choose EASYdemp Xtra, as this heavier variant offers better sound dampening.
For effective hood insulation, it is crucial to apply EASYdemp precisely and seamlessly. Avoid gaps, as they act as sound leaks and make the insulation less effective.
Step 3: Add sound absorption
With the firewall now reinforced, the initial results are already noticeable. In this next step, we'll reduce the noise level in the engine bay. For this, use EASYfoam FireSeal HR, a fire-resistant foam with a heat-resistant layer. Alternatively, for a smaller budget, you can opt for EASYfoam AC2 or EASYfoam PU. These materials provide good sound absorption and an oil-repellent top layer but are less fire-resistant and lack heat-reflective properties. It's best to use 40 mm of absorption material.
Apply this material on top of the previously installed insulation on the firewall, on the engine side. Here, seamless fitting isn't necessary; the priority is to add as much absorption as possible. If possible, you can also place this material elsewhere, such as under the hood. However, ensure there is enough space for proper ventilation and temperature regulation. For added safety, we recommend securing the material mechanically to vertical surfaces, for example, with clamps.
Adding these extra materials reduces the reverberation in the engine bay, resulting in a quieter vehicle.
The most popular products
For bonnet insulation
To reduce engine noise and make your car or motorhome quieter, perform the steps above. The most commonly chosen products used for this purpose are:
