Mahle Rings Performance Napier Steel 2nd Ring 4.320in x 1.0MM .136in RW Plain Ring Set

This is a Mahle OE Performance Napier Steel 2nd Ring Set, part number 3021236. These rings are designed for specific engine builds where improved oil control and performance are key. The Napier hook design on the second ring helps to scrape oil from the cylinder wall, preventing it from entering the combustion chamber. This is crucial for maintaining engine health and preventing issues like oil burning and fouled spark plugs.

The steel construction offers good durability for performance applications. The 4.320 inch bore size and 1.0mm width are specific dimensions for certain engine builds, often found in performance or heavy-duty applications. It's important to ensure these dimensions match your piston and cylinder bore specifications for a proper seal and optimal function. These rings are a well-built component for rebuilding or upgrading an engine.