Clutch Kits
Is your original clutch no longer up to your engine's power, or is the car heading for a track day? A clutch kit typically combines the disc, pressure plate and often the release bearing in one package, so the parts are matched to each other and to the specific car model.
How to choose the right clutch kit
A clutch kit replaces the parts that transfer the engine's torque to the gearbox. Contents vary: some kits consist of a clutch disc and pressure plate, while Clutch Masters, for example, also offers kits with a flywheel and hydraulic slave cylinder. So check whether your project also requires a new or resurfaced flywheel before you order.
- Torque: The kit's capacity must match the engine's current and planned torque, not just its power. A turbo engine running higher boost can require significantly more.
- Disc type: A sprung disc, as in ACT's HD/Perf Street Sprung kits, dampens vibrations in the hub. Unsprung discs and metallic linings can give harsher engagement.
- Single or twin plate: Two plates can increase capacity without a larger diameter, but behaviour and noise depend on the product.
- Pedal effort and use: A stronger pressure plate can result in a heavier pedal. Consider the balance between daily driving, city driving and track days.
The kits are made for specific models, such as the Ford Focus RS, Mazda MX-5 Miata and Audi A3, so check both the engine code and the gearbox. During installation, you should also check the crankshaft seal and pilot bearing and bleed the clutch hydraulics. Most clutches need to be broken in over a period of time; follow the manufacturer's instructions. In addition to ACT and Clutch Masters, you will also find brands such as SPEC, EPI and Action Clutch in this category.
Frequently asked questions
Should the flywheel be replaced at the same time as the clutch?
Not always. A worn, cracked or uneven flywheel should be resurfaced or replaced, as it affects engagement. Some kits include a flywheel, others do not – check the contents for the specific part number.
How do I break in a new clutch?
It depends on the product, but manufacturers typically recommend a period of gentle driving without hard launches or full load at high revs. Always follow the instructions supplied with the specific kit.
Can a new clutch slip?
Yes. Slipping can be caused by the kit's capacity being too low for the engine's torque, oil on the lining, a worn flywheel or a fault in the hydraulics. Find the cause before switching to a stronger kit.
