Engine Building

What causes valve float in a GM Ecotec? Learn how RPM, camshaft acceleration, valve spring pressure, spring rate, valvetrain mass and hydraulic lash-adjuster behavior affect high-RPM valve and rocker control.

Valve spring rate explains how quickly spring pressure increases as an Ecotec valve opens. Learn how rate affects open pressure, camshaft compatibility, high-RPM valve control, and usable spring travel.

Valve spring pressure depends on installed height. Learn how installed height affects Ecotec seat pressure, open pressure, spring travel, coil bind and high-lift camshaft compatibility.

Seat pressure and open pressure measure two different parts of an Ecotec valve spring's operating range. Learn why both matter when comparing springs for camshafts, high RPM, boost, and racing.

Learn how to read GM Ecotec valve spring specifications, including installed height, seat pressure, open pressure, spring rate, coil bind, mechanical travel and the critical difference between mechanical lift and...

Learn how GM Ecotec valve springs control the valves, roller finger followers and high-RPM valvetrain, and how spring pressure, installed height, camshaft lift, spring rate and coil bind affect performance.