ACT Pressure Plates – Better by Design
Pressure plate design is the key to a clutch’s performance. ACT manufactures and builds their unique pressure plates using specially designed diaphragm springs to maximize clamp load and clutch life. ACT’s diaphragm technology is what separates us from the competition.
Most ACT pressure plates start life as new stock units that get completely disassembled and redesigned for high performance use. No, we do not manufacture every pressure plate from raw materials. Does that mean ACT is nothing more than just a rebuilder? Not so. The most critical difference is our ability to engineer and manufacture diaphragm springs, although we can make and have made virtually any other component we need.
Even the large OE clutch companies do not manufacture many of the clutches they sell. It’s usually a matter of economics. To complete their lineup of applications, they purchase much of their product from other OE manufacturers so they can avoid the high tooling and development costs associated primarily with the cover stamping. It usually costs over $100,000 per application for tooling alone just for one style cover stamping. Unless there are substantial weaknesses with the stock cover stamping design that cannot be overcome otherwise, it is just not practical for ACT to design and purchase our own tooling.
In the case of the Integra B-series clutch, there were so many limitations with the original design (hmmm would that be the exedy design????) that engineering a completely new pressure plate was indeed the best alternative. Therefore ACT engineered and manufactures the complete cover from scratch. It took substantial investment for stamping dies and other tooling but the results were worth it. We could have saved significantly on tooling by making it a pretty aluminum cover, but the performance would have suffered. Sure we could get more money for pretty anodized aluminum pressure plates, but what is the purpose if it can’t perform as well? We want to provide real value to the customer, not just perceived value.
In some cases the only original parts ACT uses are the cover and the pivot rings. The rest of the parts (diaphragms, rivets, torque straps, clutch face) we manufacture. On most pressure plates ACT offers, we compare and choose the best OE style pressure plate available and change the diaphragm spring and then make changes for increased clamp load and improved reliability. On a number of pressure plates, we weld a reinforcement gusset to the cover stamping for increased rigidity (far more economical than a new cover).