Patent ID: 7533638

Claim:
A variable compression ratio piston and rod assembly for an internal combustion engine, said assembly comprising: a piston having a pin bore centered along a first axis; a piston pin disposed in said pin bore; a connecting rod having a lower crank end and an upper piston end, said upper piston end including a rod bore centered along a second axis that is offset from and parallel to said first axis of said pin bore; an eccentric bushing pivotally interconnecting said piston pin and said rod bore, said eccentric bushing including a bore along said first axis that receives said piston pin and an eccentric outer journaled portion carried in said rod bore, said eccentric bushing being rotatable so as to effect a spatial displacement between said piston and said connecting rod to effectively alter the compression ratio created by said assembly when operatively disposed in an internal combustion engine, said eccentric having at least two positions at which it can be latched; and a stop post for arresting movement of said eccentric bushing during rotation thereof from one said rotated position to another.