APR MS100085 Valve Spring System Audi and Volkswagen 2.0T
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The APR MS100085 Valve Spring System is a high performance, lightweight upgrade designed to increase valve control and eradicate valve float. It's not uncommon to experience valve float with the OEM valve springs, even below the OEM rev limit. On the 2.0 TSI, backpressure from the K04 turbocharger can force the exhaust valves open. On other applications, valve float can begin to occur just beyond the OEM rev limit. APRs design specifications called for a valve spring, retainer and spring seat combination that would not overpower and snap the OEM valves or erode the aluminum spring seat, while still maintaining exceptional valve control. The result is an advanced design that is 28% lighter yet 20% stiffer than the high performance OEM Golf R setup and is proven to eliminate the OEM valve trains weakest link.
Weight reduction, and not necessarily stiffness, is absolutely necessary to increasing valve control. APR utilized a beehive design that allows for a reduction in mass in not only the spring itself, but also through use of a smaller titanium retainer. The springs feature an ovate wire design that allows for even stress distribution resulting in better control at high RPMs through a resistance of harmful valve float inducing harmonics. The lightweight design also accomplishes accurate valve control without requiring overly stiff springs which have been proven to snap OEM valves in half. Each APR valve spring weighs 29 grams and represents a 19% weight reduction over the OEM Golf R spring.
Valve Spring Retainers
Due to the beehive spring design, APRs Engineers were able to design a smaller titanium valve spring retainer weighing only 2 grams each! By offering outstanding weight savings, exceptional valve control characteristics are achieved while only requiring a modest 20% increase in stiffness over the OEM Golf R spring.
Valve Spring Seats
The factory heads are aluminum, and unfortunately increased spring pressure can distort or erode the mating surface overtime as they mate directly to the bare head. To prevent this from happening, APRs Engineers designed valve spring seats out of 4140 heat-treated chrome moly steel with a black oxide coating. The spring seats are strong enough to withstand pressure from the springs and provide a mating surface that evenly distributes spring load across a larger area than the spring itself, allowing an increased spring rate without negative side effects to the aluminum head.
APR MS100085 Valve Spring System Vehicle Fitment:
APR MS100085 Valve Spring Install: Installation of the APR valve springs requires cylinder head removal. Professional installation recommended.
APR products are warranted to be free from defects in the materials and workmanship prior to installation. This warranty does not cover labor, misuse, faulty installation, failure of related parts or parts purchased other than from APR, LLC. This warranty extends to the original purchaser for as long as they own the vehicle and the APR product.