Fast Road HD1 (Stage 1) clutch - Fast Road
 
Black Diamonds Stage 1 clutch kit is recommended for vehicles with up to a 20% increase in torque above standard. The clutch disc has a spiral woven glass fibre friction material with a heavy copper core. The glass fibre is a fairly soft material which allows for a smooth engagement of the clutch and consistent performance from low to high temperatures. The added copper in this friction material allows the clutch to perform well at even higher temperatures, as well as improving burst strength (approximately 9000 RPM) and helping to dissipate heat through the material. The strong springs used in Black Diamond’s Stage 1 clutch kit create greater clamping pressure on the clutch disc, providing a more instant response and reducing the chance of unwanted slippage. As the organic compound used in the Stage 1 clutch disc is relatively soft, it also benefits from a minimal breaking in period.
 
100% Kev-TEK (Stage 2) clutch - Fast Road/Competition
 
Black Diamond’s Stage 2 clutch kit uses an aramid fibre friction material similar to Kevlar and is recommended for vehicles with a torque increase of up to 30%. These clutch kits provide an even stronger clamping pressure than the Stage 1, as well as boasting an even higher burst strength. This is aided by the extreme hardness of the aramid fibre material, which is nevertheless very lightweight. This friction material requires a breaking in period of about 600 miles of gentle use, this is to ensure it reaches it’s full friction qualities. The Stage 2 clutch kit is capable of withstanding the high temperatures associated with competition driving and so is ideal for the track. With the rigidity of these drive plates it's important that all flywheels are checked for wear as any imperfections or dishing of the flywheel will result in loss of contact with the friction material.
 
Paddle (Stage 3) clutch - Full Race
 
Black Diamonds Stage 3 clutch kit is recommended for increases in torque of between 30 and 60%. We use a cerametallic friction material, allowing it to be able to cope with extremely high heat and torque. These paddle clutches are an excellent option for track use, heavily modified engines and chipped or mapped diesels where the torque increases exponentially. Black Diamond’s Stage 3 clutch kit, with its very high clamp load and stainless steel backing plates ensures that maximum torque is transmitted from the engine to the wheels on the ground with minimum risk of overheating or slipping. Our stage 3 paddle clutch retains the driveability required in normal road use, although some changes to driving style are required (more revs to pull away). We can make your paddle clutch with 4, 5 or 6 paddles depending on the diameter of the drive plate.