aimants pour volant d'inertie

Comment savoir si les aimants du volant moteur sont défectueux ?

As an expert in flywheel magnets repair, I’ve seen many cases where the performance of engines has been negatively impacted due to faulty or damaged flywheel magnets. In this article, we will discuss the signs that indicate your flywheel magnets might be going bad and how you can diagnose the issue before it leads to bigger problems.

aimants pour volant d'inertie

Comment savoir si les aimants du volant moteur sont défectueux ?

1. Reduced Engine Performance

If you notice a decrease in your engine’s power or efficiency, this could be a sign that your flywheel magnets are weakening. A malfunctioning flywheel can lead to ignition issues and poor combustion.

2. Difficulty Starting Your Engine

Having trouble starting your engine? This could be another symptom of faulty flywheel magnets. The ignition system relies on strong magnetic fields from the flywheel to generate sufficient voltage for the spark plug.

3. Misfiring or Erratic Ignition

If your engine is misfiring or experiencing erratic ignition, this may also indicate an issue with your flywheel magnets. A weak magnetic field can cause inconsistent ignition timing and spark delivery.

Diagnosing Flywheel Magnet Issues

Before jumping into a full-blown repair process, diagnosing whether the problem lies within the flywheel magnets or somewhere else in the system is essential.

Visual Inspection

Check for visible signs of damage on the flywheel, such as cracked, broken, or corroded magnets. If you spot these issues, this is likely causing poor performance.

Using a Multimeter

You can use a multimeter to measure the resistance between each pair of adjacent poles on the magnet. If there’s a significant difference between measurements, it might suggest that some magnets are weaker than others.

How do you know if your flywheel is going bad?

Keep an ear out for odd noises when starting up your motor, like a rattling sound when pressing or releasing the clutch. Does it feel like your clutch “grabs” when engaging? If you spot these red flags, chances are your flywheel needs some attention!

How do you remagnetize a flywheel magnet?

Need to give your flywheel magnet its mojo back? Just grab a strong neodymium magnet and carefully bring it close to the flywheel magnet. Look! Your flywheel magnet’s magnetic force will bounce right back, ready for action. Simple, right?

What is the purpose of magnets in a flywheel?

They serve an important purpose: using active magnetic bearings (AMB) to keep the rotor’s shaft suspended without friction. This clever trick helps maintain high efficiency while the flywheel spins smoothly within its vacuum chamber. Cool, right?

How to magnetize a flywheel magnet?

Ready to magnetize a flywheel magnet? Follow these steps: First, take a strong neodymium magnet and secure it in a stable position. Next, carefully place the flywheel magnet near it, but don’t let them touch. Now, slowly move the flywheel magnet along the magnetic field lines toward the neodymium magnet. Make sure they’re aligned correctly. And that’s it! Your flywheel magnet should now be fully charged and ready for action. Easy as pie, right?

How many magnets are on a flywheel?

These are generally two magnets on one side of the flywheel, and the opposite side is a balance. The counterweight is built in, you can’t see it. If you have any questions, take a peek at your flywheel’s specifications or consult the manufacturer.


Identifying bad flywheel magnets is essential to maintaining your engine’s performance and avoiding costly repairs. You can diagnose potential issues early by paying attention to signs like reduced engine performance, difficulty starting your engine, and misfiring or erratic ignition. Remember that if you have doubts about your ability to perform these repairs yourself, it’s best to seek professional help for a successful outcome.


Puis-je réparer moi-même des aimants de volant défectueux ?

Yes! With the right tools and some knowledge about engines, you can repair or replace flywheel magnets yourself. However, it’s always safer to consult a professional mechanic if you’re not confident in your abilities or lack the required tools.

Quelle est la durée de vie des aimants de volant moteur ?

The lifespan of flywheel magnets can vary depending on how well the engine is maintained and the magnets’ quality. Generally, they should last for many years without any issues.

Les aimants du volant moteur sont-ils tous identiques ?

Non, les aimants pour volant moteur sont de tailles et de formes différentes. Ils sont également fabriqués à partir de matériaux différents, ce qui influe sur leurs performances.

Puis-je remplacer un seul aimant défectueux au lieu de tous ?

Bien qu'il soit possible de ne remplacer qu'un seul aimant défectueux, il est généralement préférable de les remplacer simultanément afin de garantir un champ magnétique homogène sur toute la surface du volant.

La faiblesse des aimants du volant moteur peut-elle endommager d'autres pièces de mon moteur ?

Oui ! S'ils ne sont pas traités, les aimants du volant moteur défectueux peuvent entraîner un mauvais calage de l'allumage et une mauvaise production d'étincelles, ce qui peut, avec le temps, endommager d'autres composants, tels que les soupapes ou les pistons.

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