Tomei Billet Full Counter Weight Crankshaft 4G63 2.2L – EVO 1- 9

By preparing counter weight on every cylinder, making inertia power balance so that bent of the crankshaft is suppressed and vibration and friction is reduced, while the reliability of bearing is raised.

Two-route oil supply from two journals secures crankpin an enough amount of oil supply.
Moreover, X shape oil passage enables supplying oil using the centrifugal force of a crankshaft, reliability of the oil supply at high RPM is improved. Furthermore, and resistance of oil flow is reduced by giving a modification on oil hole exit.

At high RPM, counterweight rotates at more than 200km/h inside the crankcase through the oil and air.
We designed the edge shape of the counterweight hydro-dynamically sharp so that less resistance will occur even at high rotation.