Clutch Components
The clutch connects the transmission and the engine. When it is engaged, it clamps onto the flywheel and transfers power from the transmission to the wheels. It also determines the power output relative to the weight of the car and engine power. With regards to car performance, the basic principle is that the less power needed to get the flywheel moving, the more power available for the transmission and the wheels.
When seeking to increase the engine RPM and achieve top acceleration, there is a need to reduce the weight of the clutch components or the car itself. The latter might not be easy hence most engineers resolve to shave off some weight from the performance clutch and the flywheel. That's why materials like carbon fiber are quickly gaining prominence. So let's look at how the clutch and flywheel improve your car performance.
The flywheel plays a critical role in freeing up engine horsepower in performance cars. Efficiency is usually achieved by tweaking the weight of the flywheel. Heavy flywheels are used in commuter cars as they allow easy gradual acceleration and better power holding capacity. They are smoother and quieter thus improving the drivability of the car.
However, they are slow in shifting. On the track where the goal is to maintain high RPMs, you need a flywheel that will quickly pick up the speed for faster acceleration. There are three types of flywheels that you need to consider if you are to make the most out of your car.
Therefore, when improving your car with aftermarket flywheel, take these three options into consideration.
A heavier flywheel takes more time to gain momentum. It also takes longer to slow down or lose the gathered momentum. On the other hand, a lighter flywheel picks up the power from the engine very fast and can also slow down very quickly during clutch dumping.
The result is a faster engine response on the track. The downside to a lighter flywheel is a reduced inertial spin on a hill. You will need direct effort from the engine as soon as you start climbing the hill. Therefore, for optimum performance consider extremely light flywheels on flat tracks that demand quick revs and stops.
When you engage the clutch, the clutch plates separate the engine from the drive wheels to allow you to change the gear. As you release the clutch, the plates reengage to connect the drive wheel to the engine. This process is usually electronically monitored to avoid breaking the cogs on the flywheel.
The clutch performance is dependent upon several aspects and components:
These discs influence how the clutch feels when you engage a gear. The smoothness or roughness of the engagement depends on the availability of dampening springs on these discs.
These springs cushion the interaction between the outer engagement material and the transmission. Discs without the springs are prone to abrupt clamping causing a ‘jerky’ feeling. They are mostly recommended for drag races and drifting where you need to put down a lot of power almost instantaneously.
Clutch disc material can also improve the overall performance of the clutch. Those with carbon fiber lining are extremely lightweight and can take a lot of heat. In fact, they perform best when heated up, so pre-race warming is recommended to prevent slippage.
Therefore, you might want to purchase these if you're planning on some racetrack action. Metallic and ceramic discs with up to six pucks are also recommended for extreme performance.
These discs are smaller and feature more prominent riveting to increase the surface area. Since they go through a lot of wear and tear, some manufacturers such as Exedy make them with room for dismantling to allow for the replacement of worn out parts.
Organic discs with a continuous edge are preferred for the day to day driving. Some may be supplied with Kevlar material to suit the needs of spirited street drivers. They are characteristically larger with a fewer amount of riveting.
This information can help you unlock the full potential of your car. High-end units might promise more power and performance but not when applied to the wrong car.
Note that more power will also contribute to the wearing of your transmission parts.
Yes, replacing a flywheel is definitely considered a fairly involved and complex automotive repair. It's not something for a beginner mechanic.
The transmission needs to be removed to access the flywheel, which requires disconnecting driveshafts, exhaust components, shift linkages, electrical connectors, and potentially other parts depending on your vehicle. Once the transmission is out, you can remove the old flywheel and install the new one – but it has to be torqued precisely.
It’s crucial to use a proper torque wrench and follow the manufacturer's specifications. Improperly torquing the flywheel can lead to serious engine damage. If you are not confident in your mechanical skills, it is best left to a professional mechanic.
The cost of a clutch and flywheel replacement varies *significantly* based on your car model, location, and whether you’re doing the work yourself or using a mechanic. Expect to pay anywhere from $800 to $2500+ for parts and labor.
Parts costs typically range from $300-$1000+, depending on quality (OEM vs aftermarket) and if you choose a performance clutch/flywheel combo. Labor can take 4-8 hours, costing around $100-$200 per hour at most shops. European or high-performance cars generally have higher labor costs due to complexity.
If you’re comfortable with mechanical work and have the right tools, doing it yourself can save a lot of money – but be prepared for a challenging job! Always factor in potential unexpected costs like broken bolts or additional worn parts.
The term ‘clutch flywheel’ often refers to the flywheel itself when discussing clutch replacements, but it's more accurate to say that the flywheel *works with* the clutch. The flywheel isn’t strictly part of the clutch assembly, but they are intimately connected.
The flywheel is a heavy disc attached to your engine’s crankshaft. When the clutch disengages, the flywheel continues spinning, storing rotational energy. When you re-engage the clutch, this stored energy helps get the car moving again. It provides inertia for smooth starts and prevents stalling.
During a clutch replacement, it's almost always recommended to resurface or replace the flywheel too. A damaged or worn flywheel can cause clutch slippage and vibrations, negating any benefit from a new clutch disc.
There are generally three main types of flywheels: stock, light steel, and light aluminum. Stock flywheels are typically found in most vehicles from the factory. They’re heavier, designed for smooth daily driving and good power holding capacity—prioritizing comfort over outright performance.
Light steel flywheels offer a mid-range upgrade. They're lighter than stock, allowing for quicker engine revs and faster acceleration, but still retain enough mass for decent drivability. Light aluminum flywheels are the most aggressive choice, favored by racers and those doing serious track work or drifting. They’re significantly lighter which improves responsiveness but can make the car more challenging to drive at low speeds.
Choosing the right flywheel depends on your driving style. Street cars benefit from stock or light steel; performance builds demand aluminum.
