What is the reason for the increased noise after installing the engine guard plate?

[MacArcher]

After installing the engine guard plate, the increased noise is caused by friction between the plate and the moving parts outside the engine, resulting in abnormal sounds. Another situation is when the plate's vibration frequency is close to that of the car, leading to resonance. Precautions: Keep the engine compartment clean to prevent road water and dust from entering. Avoid sand, stones, and hard objects kicked up by the tires during driving from hitting the engine. While there may be no immediate impact on the engine, prolonged exposure can still affect it. Disadvantages: Hard engine guard plates may hinder the protective sinking of the engine during a collision, weakening this safety feature. Steel engine guard plates, made from ordinary steel and forcibly stretched using forming molds, typically weigh between 8-13 kg. They are installed with standard steel screws and feature a semi-enclosed design with openings for the oil filter, oil hole, and transmission oil hole. The lack of a thoughtful air vent design increases air turbulence in the engine compartment, raising wind resistance and noise. During driving, steel spacers and the steel guard plate can resonate, amplifying the noise.

[Polly]

The increased noise after installing an engine guard is mostly caused by resonance or installation issues. Engine guards are typically mounted under the chassis. If the material is too rigid or not securely installed, it can easily resonate with engine vibrations, making the engine sound louder. I've encountered similar situations before. During inspection, first check if the guard screws are properly tightened—loose screws can amplify noise. Then, test the sound changes at different speeds. If the noise only increases within a specific speed range, it's likely due to resonance. Additionally, rigid metal guards reflect engine noise more than plastic or composite materials, making the cabin noisier. It's recommended to remove the guard, add some damping pads or soft rubber strips, or switch to a flexible material guard to absorb vibrations. Don’t forget to check if the original chassis sound insulation is blocked, and ensure the installation doesn’t interfere with the vehicle's original design. Regular maintenance is also important. DIY installation carries risks, so it's best handled by professionals.

[DelLawson]

I usually enjoy tinkering with car modifications, and the increased noise after installing an engine guard is indeed annoying. The main issue lies in the material of the guard. Metal plates amplify the low-frequency vibrations from the engine, especially when mixed with wind noise at high speeds, making it even more unpleasant. I've tried several types of guards and found that rigid iron plates are the most prone to resonance effects, acting like an amplifier for sound. Installation position is also crucial—if it's misaligned or the screw holes don't match, gaps in the chassis can cause hissing sounds as air flows through. The solution is simple: first, use tools to ensure all mounting points are secure and not loose; then consider adding soundproofing materials like felt or rubber pads on the inner side of the guard, which can significantly absorb vibration noise. If a plastic guard is deformed, replace it promptly instead of making do. This issue involves aerodynamics—a guard that's too thick or lacks ventilation can affect cooling and indirectly introduce unwanted noise. Don't rush to remove the guard; it's very practical for protecting the engine, but choosing the right product is key. Visit a few shops and listen to the mechanics' advice—you'll find a solution eventually.

[VonJordan]

After installing the engine guard, increased noise is commonly caused by installation issues. Loose screws leading to guard vibration and impact, or improperly wrapped edges creating cavity resonance. During inspection, focus on whether the mounting brackets align with original holes—misalignment can cause friction with chassis components, amplifying noise. Material also matters; rigid metal guards tend to amplify engine echoes, while switching to lightweight composite materials can help. I recommend driving directly to a repair shop for a lift inspection. If DIY, simply tighten screws with a wrench—avoid cheap, low-quality guards. Noise may indicate overlooked chassis cleaning during installation, as dust buildup disrupts airflow. Remember, guards protect the oil pan from scrapes, but choose proper specs to avoid blocking cooling vents and causing overheating risks.