When building a performance cylinder head for higher power output from larger turbochargers, the power band is increased and moved higher into the RPM band. This puts increased stress on the valves resulting in valve float from the weak factory valve springs. Rev higher and increase your RPMs safely by adding Ferrea's?spring retainer kit to your engine build. Heavy duty valve springs and spring rates keep the valves operating?correctly under high-load engine conditions while the extra-strength titanium retainers provide less weight for an easier revving engine.
Valves play a critical role in any performance orientated engine. Upgrading the valves in your VW or Audi engine increases reliability with slow forging processes, upgraded aerospace alloys, CNC machining, and heat treatments to withstand extreme abuse from high-powered race engines and daily driven road vehicles making beyond factory power levels. The power an engine produces is limited to airflow. As the smallest chokepoint in your cylinder head, performance valves are engineered to increase airflow by limiting turbulence created by valve stem obstruction and careful detailing of the valve head and valve angles.
IE performance exhaust valve seals are manufactured from a?high-temperature resistant Viton? material designed to hold up to the increased heat from performance built engines, preventing premature oil seepage past the valve guides.
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