Piston rings sold seperately.
Sold in sets.
Bore: 81mm (81.02mm)
Compression Ratio: 12.1:1
Dome/Dish Volume: 7.5
Head CC's: 42.7
Compression Height: 1.181" (30mm)
Skirt Style: X
Rod Length: 5.429"
Pin Diameter: 21mm (.827")
Weight (grams): 241
Piston Part Number: P4-H81-P7
Rings Part Number: GNH8100
Supertech engineers have more than 40 years of experience in the design and production of racing pistons. We utilize the latest in CAD software & Finite Element Analysis (FAE) which enables us to design a strong, light weight and high performance piston. We offer Supertech high performance pistons for just about every application. If you dont find what you are looking for we can build you a custom piston specific to ySupertech requirements.
Supertech pistons are manufactured in Argentina with technology transferred from European manufacturers. All of Supertech pistons are manufactured to ensure the highest durability while recognizing the utmost performance improvements.
Our pistons are manufactured from extruded high silicon, enhanced 4032 alloy (with additional Cu, Ni & Mg) that has low thermal expansion and features excellent wear resistance. Additionally, the inclusion of enhanced 4032 alloy offers a much higher thermal conductivity. Using this alloy Supertech Supertech pistons have withstood up to 42psi of turbo boost with alcohol, without any problems.
Depending on the type of piston we have either a 2 or 3 step forging process that yields a fine structural grain orienting the fibers in the same direction of the stress. Combine this with several heat treatments and Supertech pistons feature an evenly distributed hardness and extremely high tensile strength. From there each Supertech piston goes through several machining steps specifically designed to ensure dimensional precision, perpendicularity and flatness of the ring grooves.
All of Supertech pistons feature reduction grooves, honed and reamed pin bores for the most precise fit, while Supertech wrist pins are constructed of cold extruded chrome moly steel for high strength to be used with wire clip locks.
Supertech takes great pride in what we call Supertech pistons surface finish. This finish is Supertech "phosphate dry lubricant" coating that is applied to protect the rings against "micro welding" and enhance lubrication on the skirt/cylinder area.
Supertech Piston rings are manufactured in Japan with the latest technology for high performance applications. We have quality control in place at every step of the manufacturing process in a climate controlled environment to ensure reliability of dimensions.
FOOT NOTE: T (Turbo) / N (Nitrous) / A (Naturally Aspirated) / R (Round) / X (Slipper style)