How to Soundproof the Engine Compartment?

[MacWilliam]

There are several methods to soundproof the engine compartment: 1. Install a firewall U-channel in the engine compartment for soundproofing, which requires the use of firewall sandwich foam and damping sound insulation vibration pads. 2. Remove the dashboard in the cabin for soundproofing, which requires the use of damping sound insulation vibration pads, damping sound insulation absorption foam, and polyester fiber cotton. 3. If you do not want to work in the engine compartment or remove the dashboard, you can cut polyester fiber cotton into blocks and use tools to fill them inside the dashboard to make it more solid, thereby achieving the purpose of isolating engine noise.