The TOMEI Crankshaft is available as Semi-Counter Balanced or Full Counter Balanced. By counter weighing every cylinder, the crankshaft will suppress excess vibration and reduce friction. This increases durability and reduced the chance of engine failure. Two-route oil supply from two journals ensures enough oil is supplied to the crank. Moreover, the distinct "X" shape oil passage enables oil to be supplied using the centrifugal force of a crankshaft. This increases reliability of the oil supply at higher RPMs. NISSAN Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes 1991 - 1999 180SX S13 L4 2.0 T SR20DET GAS 1989 - 1994 240SX ALL ALL ALL ALL ALL ALL w/ SR20DET Swap 1995 - 1998 240SX ALL ALL ALL ALL ALL ALL w/ SR20DET Swap 1989 - 1994 SILVIA ALL ALL ALL ALL ALL ALL 1995 - 1998 SILVIA ALL ALL ALL ALL ALL ALL 1999 - 2002 SILVIA ALL ALL ALL ALL ALL ALL