The APR Valve Spring System is a cutting-edge, high-performance upgrade engineered to address the issue of valve float commonly experienced in various applications. With a focus on increasing valve control, APR's design specifications prioritize the balance between power and component durability. The system consists of carefully engineered valve springs, retainers, and spring seats specifically designed to prevent overpowering and potential damage to the OEM valves and erosion of the aluminum spring seat. Despite being 28% lighter, this advanced design offers a remarkable 20% increase in stiffness compared to the high-performance OEM EA113.K04 (MK6 R) setup. The APR Valve Spring System delivers exceptional performance without compromise by eliminating the weakest link in the OEM valve train. Experience the power and reliability you deserve with this state-of-the-art upgrade.

Valve Springs:

Weight reduction, rather than stiffness, is crucial in achieving optimal valve control. The APR Valve Spring incorporates a beehive design that effectively reduces mass, not only in the spring itself but also through the use of a smaller titanium retainer. These springs ensure even stress distribution by employing an ovate wire design, resulting in superior control at high RPMs and effectively counteracting harmful valve float-inducing harmonics. This lightweight design enables precise valve control without the need for an excessively stiff spring that could potentially lead to the breakage of OEM valves.

Weighing in at just 29 grams, each valve spring represents a notable 19% reduction in weight compared to the OEM EA113.K04 (MK6 R) spring. This highly engineered design offers a plug-and-play solution, allowing for straightforward installation and seamless integration. Experience the benefits of APR's innovative approach, combining weight reduction and exceptional performance in a carefully crafted valve spring system.

Valve Spring Retainers:

APR's valve spring system utilizes a beehive design and smaller titanium retainers to reduce weight. The American 6AL4V titanium retainers weigh only 2 grams each, offering an additional 71% reduction compared to OEM retainers. Despite the weight savings, the system maintains exceptional valve control with a modest 20% increase in stiffness over the OEM spring. Experience the benefits of APR's lightweight design for improved performance and reliability.

Valve Spring Seats:

The valve spring seat is an often overlooked component of an upgraded valve train. In the case of factory heads made of aluminum, the mating surface can become distorted or eroded over time due to increased spring pressure. APR's Engineers have developed valve spring seats crafted from 4140 heat-treated chrome moly steel with a black oxide coating to combat this issue.

These valve spring seats are engineered to withstand the pressure exerted by the springs and provide a mating surface that evenly distributes the spring load across a larger area compared to the spring alone. This design allows for an increased spring rate without adverse effects on the aluminum head. By using robust materials and thoughtful engineering, APR ensures the durability and optimal performance of the valve spring system. Say goodbye to concerns about mating surface distortion and enjoy enhanced valve train performance with APR's meticulously designed valve spring seats.

Eliminating Valve Float:

Experiencing valve float is not uncommon, even below the OEM rev limit, due to weak OEM valve springs or loss of stiffness over time. APR's Valve Spring System eliminates valve float, ensuring improved engine performance and reliability. It addresses issues such as misfires and loss of acceleration commonly observed above 5,000 RPM. The system effectively controls exhaust valve opening caused by back pressure from turbocharger upgrades. Benefit from increased valve control and a wider rev range with APR's meticulously engineered solution.

Kit Includes:

Each kit includes 1 valve spring, 1 valve spring retainer, and 1 valve spring seat. Simply purchase the necessary amount for your vehicle. Most setups have 4 valves per cylinder.

• 4 cyl – 16 valve spring kits
• 5 cyl – 20 valve spring kits
• 6 cyl – 24 valve spring kits
• 8 cyl – 32 valve spring kits
• 10 cyl – 40 valve spring kits
• 12 cyl – 48 valve spring kits
• 16 cyl – 64 valve spring kits