1.090 Valve Spring Set Mitsubishi 4-Cylinder

The CROWER 1.090 Valve Spring Set (Part No. 68190-16) is a precision-engineered valve spring assembly designed for Mitsubishi 4-cylinder engines requiring performance-level spring rates and coil bind specifications. This set of 16 springs features a 289 lb/in spring rate and 0.920-inch coil bind specification, making it suitable for applications where factory spring pressures are insufficient or where engine modifications demand enhanced valve control.

CROWER valve springs are manufactured to strict tolerances that ensure consistent seat pressure and proper valve seating across the entire RPM range. The 1.090-inch outer diameter (OD) accommodates standard Mitsubishi 4-cylinder valve locations, while the 289 lb/in rate provides the stiffness needed to manage higher valve lift profiles or extended RPM operation without valve float. The 0.920-inch coil bind clearance is critical for preventing coil stack-up and maintaining reliable spring action during valve transitions. Each spring in the set is individually inspected to maintain uniformity, which is essential for balanced cylinder-to-cylinder performance and predictable engine behavior.

This spring set serves builders and technicians working on Mitsubishi 4-cylinder applications—whether naturally aspirated performance builds, turbocharged engine combinations, or high-RPM track applications. Situations requiring upgraded valve springs include aggressive cam profiles, elevated fuel octane tuning, or engine modifications where factory spring rates no longer provide adequate valve control. The set of 16 ensures you have complete coverage for all intake and exhaust valve positions across the engine block.

CROWER's reputation in the performance automotive market is built on precision manufacturing and validation across competitive and street-driven platforms. Valve springs represent one of the most critical components in modified engine packages, as inadequate spring rates directly result in loss of power, erratic idle characteristics, and potential valve train damage. The 1.090 OD specification confirms direct fitment to Mitsubishi 4-cylinder designs, and the measured spring rate ensures compatibility with existing valve train geometry.