Automobile: everything you need to know about the silent block

On a car, the silent block is only placed between parts whose movements are of very small amplitude. This part which helps to improve your driving comfort can be used to attach an exhaust line or to insulate the engine from the metal frame. Topo on the essentials to know.

Definition and use of the silent bloc

The silent block is an essential automobile part to maintain the longevity of an engine. Its shape and number vary depending on the car model or brand.

Definition and use of the silent bloc

The silent block is a mechanical component of cars. This key element of the mechanical part limits noise pollution at the joints of your vehicle. By holding the elements of a vehicle together, it absorbs shock and noise. THE silent block also reduces the vibrations generated by the powertrain, by transmission jolts, but also by the travel of the gearbox and the engine. Without it, shifting gears would simply be impossible and the shaking would be unbearable. This part, made of flexible material such as rubber or polyurethane, includes two fixing bases which are connected by a particularly resistant elastic band. The silent block intended for sports cars is reinforced. Read also: Tesla Cybertruck: Elon Musk’s futuristic electric pick-up is a hit

The different types of silent blocks

There are two types of silent blocks: for the engine and for the exhaust. The engine silent block reduces vibrations generated by the engine, gearbox and clutch. There are different types, including hydraulic, anti-tip, pendulum and one that includes an elastic block. The exhaust silent block is used to reinforce the exhaust line by maintaining it on the chassis. This model must be perfectly resistant to heat which can sometimes reach 220°C. Read also: Porsche Taycan: Everything about the first electric sports car

The impact of the silent block in motorsport

On racing cars, the silent block is installed at the level of the chassis, because the compression stresses are greater there. It ensures that the parts do not suffer breakages due to vibrations and shocks.

The silent block on sports cars

The silent block is an important part for competition cars. It makes it possible to limit jolts, to make the connection between the various parts of a car, but also to reduce engine shaking. It serves as a shock absorber between the different elements of the engine in order to promote silent, smooth and shock-free driving.

When to replace the silent blocks?

Check the condition of your silent block after 80,000 kilometers to detect a possible failure, especially if your car is used for racing. Also be vigilant if more or less violent jerks are felt in the clutch or steering wheel. Jolts when accelerating or starting the vehicle are all indicators that should not be overlooked. If, in the worst case scenario, your speeds jump, change your silent blocks immediately.