WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR Valve Spring Kit (MS100258) is a high-performance, lightweight valvetrain upgrade engineered to increase valve control and eliminate the "valve float" issues common in high-boost or high-RPM applications. By utilizing an advanced beehive spring design and aerospace-grade materials, APR has created a system that is significantly stiffer than factory components without being so aggressive that it risks snapping OEM valves or eroding the cylinder head. This kit is the definitive solution for enthusiasts looking to safely increase their engine's rev limit or run high-output turbocharger setups.
The system features a 20% increase in stiffness over the high-performance EA113 K04 (Golf R) springs while achieving a massive 71% weight reduction in the retainers. By using American 6AL4V Titanium for the retainers and heat-treated Chrome Molly steel for the spring seats, APR ensures that the valvetrain remains stable and durable under extreme conditions. These components are a direct "plug and play" replacement and are fully compatible with OEM valves.
Key Features:
- Superior Valve Control: Eradicates valve float, a common failure point on MQB and older 2.0T platforms during high-boost operation.
- Extreme Weight Savings: Features a 71% weight reduction in retainers and a 19% reduction in spring weight compared to the MK6 Golf R (K04) setup.
- Increased Stiffness: 20% stiffer than factory performance springs, allowing for higher RPMs and better response.
- Premium Materials: Utilizes ASTM A877A OTSC round wire steel for springs and 6AL4V American Titanium for the retainers.
- Head Protection: Includes 4140 heat-treated Chrome Molly spring seats to prevent the springs from eroding the aluminum cylinder head.
- Beehive Design: The specialized spring shape reduces unsprung mass and improves harmonics at high engine speeds.
Technical Specifications:
| Component | Material / Weight |
|---|---|
| Springs | ASTM A877A Steel / 29 Grams |
| Retainers | 6AL4V Titanium / 2 Grams |
| Spring Seats | 4140 Chrome Molly (Black Oxide Coated) |
| Stiffness | +20% over EA113 K04 OEM |
Ordering Note: These components are sold individually. For a standard 4-cylinder 16-valve engine, a quantity of 16 is required for a complete overhaul.
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