Engine Building

Higher RPM gives an Ecotec valvetrain less time to complete each valve event. Learn how engine speed increases spring demand and why RPM must be matched with camshaft profile, valve...

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.

Coil bind isn't the only limit on Ecotec valve lift. Learn how retainer-to-seal clearance, valve guide clearance, spring seats and retainers determine the usable lift of a performance Ecotec cylinder...

Understand Ecotec valve spring coil bind, mechanical travel, recommended maximum lift, coil-bind clearance, and why BK Racing advertises a conservative .520" operating limit instead of the system's measured mechanical capability.

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.