Engine Building

Drop-In vs. Modified GM Ecotec Valve Spring Systems

featured Drop-In vs. Modified GM Ecotec Valve Spring Systems

Does your Ecotec need cylinder-head modifications for upgraded valve springs? Learn the difference between drop-in and modified spring systems and when machining, retainers, seals, or spring-seat changes are actually necessary.

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Single vs. Dual Valve Springs for GM Ecotec Engines

Single vs. Dual Valve Springs for GM Ecotec Engines

Does a performance Ecotec really need dual valve springs? Learn how single and dual springs compare in pressure, spring rate, lift, dynamic control, installation and high-RPM performance.

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How Camshaft Lift Affects Ecotec Valve Spring Selection

How Camshaft Lift Affects Ecotec Valve Spring Selection

More camshaft lift increases Ecotec valve spring compression and open pressure while reducing mechanical clearance. Learn how lift affects coil bind, retainer-to-seal clearance and spring selection.

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How to Match Valve Springs to Ecotec Camshafts

How to Match Valve Springs to Ecotec Camshafts

Matching Ecotec valve springs to camshafts requires more than comparing maximum lift. Learn how cam profile, RPM, spring pressure, spring rate, valvetrain mass and mechanical clearance determine the correct combination.

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Ecotec Valve Float vs. Valve Bounce vs. Spring Surge

Ecotec Valve Float vs. Valve Bounce vs. Spring Surge

Valve float, valve bounce and spring surge are different forms of Ecotec valvetrain instability. Learn what each means, how they interact, and why hydraulic lash instability should be diagnosed separately.

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How RPM Affects Ecotec Valve Spring Requirements

How RPM Affects Ecotec Valve Spring Requirements

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...

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