MAHLE Piston Ring Support Rail Bore

The MAHLE piston ring support rail (also called an oil ring support rail or oil ring spacer rail) is built for MAHLE pistons that use a lowered oil ring groove. It is made for engine builders and racers who want a dependable oil ring seal in a performance or racing engine.

Key Features:

• Supports the oil ring: The rail sits in the bottom of the oil ring groove and becomes the floor the oil ring stack rests on.
• Helps ring sealing: It helps maintain cylinder seal and keeps the ring under the gas pressure it needs at high rpm.
• Reduces friction: Stable ring support helps limit friction.
• Anti-rotation design: The rail is designed to stay in place in the groove and not rotate.
• Restores clearances: It helps restore original new-piston clearances so full compression can be restored.
• Made in the USA: MAHLE builds on more than 100 years of piston and ring engineering.

Each rail is sized to match a specific bore range and rail thickness. Choose the option that matches your engine build. Install the rail in the oil ring groove first, then stack the oil ring components above it as instructed by the piston and ring instructions.