TOMEI Solid Pivot
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming at higher RPM ranges and for higher horsepower output from engine modifications, it is important to improve the reliability of head system parts and to make valve drive train set correctly for the suited cam profile. So it is necessary to eliminate the use of the hydraulic lash adjusters. We have adopted the solid pivot system to enable adequate cam clearance adjustments while keeping total height of pivot of each cylinder fixed. Therefore it is possible to build a more precise head system in a shorter time compare to the other conventional methods. Improvements in the reliability and lower pricing were made possible at the same time by having reduced the number of parts required.
Mitsubishi had chosen to use the lash adjuster (hydraulic system) for the 4G63 cylinder head for mass production efficiency, maintenance free and quieter operation. The best way to get more power from the 4G63 engine is to convert it to the solid system which is by far more superior in allowing running more aggressive camshaft profiles. The Solid conversion helps with more efficient opening and closing of the valves and therefore helps improve response throughout higher RPM ranges. This product has a height adjustment function via a screw lock system which eliminates the use of shims so costs are reduced and improves running efficiency. This is best used in conjunction with the other solid upgrade products from Tomei Powered for the 4G63.