The pressure plate in the transmission assembly is crucial for engaging and disengaging the clutch disc to the flywheel. When getting a replacement part, you have the option of picking between the two types of available in the market: diaphragm style and lever style. Each is different based on construction and use. Read this guide to help you pick the perfect pressure plate for your car.
This style uses finger-like Bellville springs on the assembly. When the clutch pedal is free, the spring is pressed on the clutch so that it engages the flywheel. One of the big advantages of the diaphragm style plate is the light pressure needed on the pedal to disengage the assembly. This makes it very suitable for everyday driver on the city or highway. Also, a diaphragm assembly actually exceeds expected at the start and maintains regular performance as it gets used. Lastly, while engaged, the spring actually hits the whole clutch creating better contact to the flywheel.
Advancements in the technology on diaphragm style include changes in bolting, spring self-adjustment, and pressure that results to improvements in performance and pressure plate life.
Compared to the diaphragm style which uses springs, a lever style plate puts pressure on the levers to engage the clutch to the flywheel. This type of plate is recommended for racing and heavy duty applications. There are two main sub-types of lever springs on the market:
- Borg and Beck: This uses three levers to press coils that would connect and release the clutch disc. It relies on constant static pressure to get a consistent effect on the pressure plate every time the clutch pedal is pressed. However, this requires more effort to be applied on the clutch pedal. Use on heavy applications like muscle cars and trucks.
- Long style: Similar to the Borg and Beck style, this type of plate also uses levers on coils. One major difference is that performance is affected by the engine's RPM: the higher the RPM, the better the plate presses on the clutch. This style is perfect on performance and racing cars.