MAHLE 9299228 Oil Ring Support Rail 4.500-4.560 Inch Bore 3mm

The MAHLE 9299228 is a precision-engineered oil ring support rail designed for engine pistons with bore sizes ranging from 4.500 to 4.560 inches. This 3mm thick support rail is a critical component in high-performance engine builds and rebuilds, providing essential support for the oil control ring assembly.

Key Features:

• Fits bore sizes from 4.500 to 4.560 inches
• 3mm thickness for optimal oil ring support
• Installs in the bottom of the oil ring groove
• Features dimple design to prevent rotation
• Minimizes friction and improves cylinder seal
• Essential for pistons where the wrist pin extends into the ring land

Function and Installation:

This support rail serves as the foundation for the oil ring assembly, sitting at the bottom of the oil ring groove with the dimple positioned downward in the wrist pin bore gap. The rail prevents the oil control ring from rotating during operation, which results in improved cylinder sealing, reduced friction, and ensures the ring receives necessary gas pressure at high RPM. The support rail should fit tight against the back wall of the oil ring groove without touching the cylinder wall.

About MAHLE:

MAHLE is a world-leading manufacturer of engine components, known for producing over 100,000 OE and aftermarket parts including pistons, piston rings, engine bearings, and performance components. MAHLE products are trusted by professional engine builders and OEMs worldwide for their precision engineering and reliability in demanding applications.

Note: Sold individually. This component is commonly used in performance engine builds, racing applications, and engine rebuilds where proper oil control is critical for engine longevity and performance.