Designed to promote industry-leading longevity and wear resistance while delivering consistent, power-promoting ring seal, Pro Seal's latest piston ring innovation can serve your precision, high-horsepower build from classic to modern. SP3 ring packages consist of a DLC-coated, carbon steel top compression ring, Napier carbon steel second ring, and DLC-coated oil rings.
Top Compression Ring - 1.0mm
Carbon steel construction provides optimal strength characteristics while promoting lower chances for ring micro welding and tension loss, contributing to longer, more consistent sealing performance.
A standard in high-performance, DLC coating on the top ring provides a significantly lower coefficient of friction during engine operation, contributing to less parasitic load and higher power translation. This also allows for the use of thinner oils and provides compatibility with DI engines and dry sump systems. Increased scuff resistance achieves better and quicker break-in as well long-term wear resistance, and the coating allows the rings to be used with virtually any bore lining material, making them very versatile across engine applications.
The top ring design overall has a tighter axial tolerance and tucked tips, aiding in ring seal and reducing wear at ring tips.
Second Ring - 1.2mm
Oil Rings - 2.8mm
All-in-all, SP3 DLC-coated pistons are a natural upgrade for performance engine builds of all shapes and sizes, from high-revving, naturally aspirated to boosted engine applications.
Pro Seal SP3 DLC-coated piston rings were developed and proven through extensive, in-house engine dyno testing. They were subjected to a 50-hour, 5-day dyno test in a turbo-charged, Mitsubishi 4G63 engine capable of 550+HP.
The test consisted of consecutive, increasing power pulls after a break-in period, after which everything was torn down and inspected to determine wear, performance, oil use, blow by, tension loss and more. The SP3 rings test was benchmarked against the same sized, non-DLC rings.
SP3 rings proved to reduce oil consumption, reduce wear both on the rings and in the ring grooves, and provide consistent power delivery throughout the tests.