The JUN Super Piston Kit, manufactured by Cosworth Ltd. in Britain, is designed for corresponding to high boost, high rotation and high response. This is produced in purpose of reducing blow-by gas as well as boosting response up. The materials for this piston is the special aluminum for forging-use with manufacturing 400t press into the mold. Durability is just excellent.

A piston is the parts used on the severest conditions in the main motion parts. It moves at high speed, or stops, and receives thermal and mechanical load. On the engine which is tuned up high-level, since those loads are still larger, it is very important to secure the durability of a piston. In order to satisfy the performance demanded, JUN SUPER PISTON carried out technical cooperation to Cosworth in English, F1 engine maker, and was born.

The piston top and a piston profile are designed that it can correspond to high load or high-speed motion. The seal of the inside of a cylinder is carried out certainly, and fuel-air mixture and combustion pressure are not leaked. With the quality of the material of a general mass-production piston, if the temperature of a piston exceeds a certain temperature, durability will fall rapidly. Therefore, it becomes difficult to catch mighty combustion pressure. Since the JUN SUPER PISTON KIT is using the aluminum material only for forges, it holds the durability at the time of high temperature.

The response of the engine brings a good result if the piston which does a reciprocating movement can be created in the light weight. Furthermore, shocks to the crank shaft are decreased, and then a burden to the bearing is reduced. Because light weight and strength are so contrary, it is difficult to go together. This piston lightened a part with no relations with the strength as far as it was possible to make that go together. Furthermore, the rib-type and the Slipper-type were adopted because of lightening. This Hyper Piston Kit committed our experience and know-how fully.

The CP-Pistons is very famous as high performance piston at the United States. Recently, they started to release many kinds of pistons such as NA, Turbo, and Super Charger for JDM cars, and are building up trust. We found whether that was light weight as a strong point of their piston. Moreover, the good piston profile makes high speed motion in the cylinder, and high rigidity forged material will get durability.