Recently, our technical department received some questions about dual-friction clutch discs. Here’s why ACT chooses to go with the same friction materials on each side of our clutch discs.
Two of the most important concepts in performance clutch functionality are flatness and parallelism. When using anything other than identical friction materials on each side of a clutch disc, the differences in thermal conductivity and coefficient of friction create an unavoidable variance in temperature between the two disc surfaces as the clutch heats up. This temperature difference, combined with the unmatched thermal expansion properties, creates a condition where the disc is vulnerable to deforming out of flat and, in some cases, out of parallel as well.
Out of flat and out of parallel discs contribute to poor shifting (more pedal travel required), clutch drag and judder. You want a flat cracker but you might end up with a wavy potato chip.
Have clutch-related questions you would like answered? Send them to our Sales department.