Different weights of flywheel are available, and although these are mostly used for other performance reasons, a lighter flywheel will also have an increased clamping effect. This is the part connected to the gearbox. When the clutch is engaged the clutch plate is pushed against the flywheel to transmit power between them. There are various materials and styles of clutch plate friction pads depending on the use of the car and the torque the clutch is expected to transmit, and this will be talked about in a separate section.
This is the part that pushes the clutch plate on to the flywheel when you engage the clutch. It has sprung metal fingers arranged in a circular fashion facing inwards that give the clamping force that helps stop the clutch plate and flywheel from slipping. An uprated clutch usually has an uprated cover which increases the clamping force of the clutch cover fingers.
The downside of more clamping force is a stiffer clutch pedal, which can range from slightly stiffer to something barely useable on the road. The majority of uprated clutches are actually what is known as a paddle clutch. A paddle clutch, rather than having degrees of friction material like a standard clutch, is segmented into sections, usually four or six, but other combinations are available.
The reason for this segmented design is to help with heat dissipation. With increased power you are more likely to overheat the clutch, potentially warping it or simply ruining the friction material. Making it less effective. This means they have springs between the centre plate and the friction pads to dampen the shock load as the clutch is engaged. This makes driving it on the road, where the clutch is constantly being engaged and disengaged, much smoother than without springs.
Multi-plate clutches are commonplace these days on uned cars. They have more than one clutch plate with metal plates sandwiched between them.
Using multiple plates spreads the load and increases heat dissipation, giving increased grip for the overall diameter of the clutch. This means a twin plate using friction materials that are more road-friendly can handle similar levels of torque to a single plate race-only sintered clutch for example.
In race cars they use multi-plate clutches to save weight and rotating mass by using the smallest diameter clutch possible with a huge number of plates. Conversely, cars with very large diameter clutches as standard, V8s for example, tend to not need multi-plate clutches until a much higher power level than most four cylinder engines with smaller clutch diameters.
From a performance point of view it is why cars tend to rev faster and more freely with a lighter flywheel, especially in lower gears and of course out of gear. As ever with tuning, there is a downside, and that is a slight drop in drivability due to this decreased clutch mass as the revs drop more easily, making it harder to drive smoothly and easier to stall.
Sometimes a slightly higher idle speed is used to stop a car with a very light flywheel from stalling when the clutch is disengaged. New posts. Search forums. Avatar Upload Issue Fixed! Have you been facing problems uploading avatars?
Good news! JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Senior Member. Mar 28, 91 0 1, Oct 16, 73 1, EX: using a clutch from a wira 1. In addition to hard launches and stress-filled hill starts, you'll also have to worry about stranding yourself on the road. Using a street clutch from a Jeep Cherokee and a race clutch from a Ford Fiesta, Team O'Neil gives you a visual descriptor on how the two work, what they're good at, and what they shouldn't be used for.
Watch for yourself. Join Now. Please confirm you agree to the use of tracking cookies as outlined in the Cookies Policy. Sign in or register. Engineering Explained 6 years ago. Remind me later. Share Tweet Email Whatsapp. Why do clutch discs have internal springs? What is a performance clutch? Why would you need a performance clutch? What is a clutch? These clutches are capable of putting down around 10, horsepower.
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