TOMEI HIGH PERFORMANCE VALVE SPRING SET MITSUBISHI EVO4-9 1989-2007

High quality designed springs are required to transfer the exact movement of the camshaft to the valves at high engine speeds on high performance engines. The TOMEI products are always engineered with precision in mind to suit the user’s needs. So with this in mind careful choices in material selection have been made with surface coating and other technologies. Then the pre-production products are put through an extensive testing program for checking durability, quality and performance. They spend time and money to help you save your valuable time and money.

By combining several steps of spring rates into the one spring the vibration frequency becomes amazingly high. This greatly minimizes resonance and the chances of surging.

Oil tempered chromium-silicone alloy steel wire is used which is considered to be the best material for springs for performance applications and they evolved it even further. Combined with a new optimized design, not only did they make it tougher, they also succeeded in suppressing valve jumps or bounce even when raising the engines speeds RPM limit.