ACL BMW M20/M50/M52/M54 - 1919CC 80.0mm Bore 66.0mm Stroke .50mm Oversized Conrod Bearing Set

When you're rebuilding or refreshing the engine in your BMW, especially models like the M20, M50, M52, or M54 series, getting the right internal components is key. These ACL connecting rod bearings are a popular choice for those looking to replace worn-out bearings or build a performance engine. They're specifically sized at 0.50mm (.020 inches) oversized to fit crankshaft journals that have been machined to match this size, which is common when dealing with engines that have seen significant mileage or are being built for higher performance.

ACL uses a tri-metal overlay on these bearings, which is a well-known material for its strength and ability to handle the high loads and temperatures found in an engine's rotating assembly. This construction helps ensure good oil film retention, crucial for preventing metal-on-metal contact and extending the life of your engine. The 80.0mm bore size is specific to the engine families listed, ensuring a proper fit on the connecting rod itself, while the 66.0mm stroke dimension is a characteristic of the crankshaft these bearings are designed to work with.

This set includes all the necessary connecting rod bearings for your engine rebuild. If your crankshaft has been machined to a 0.50mm undersize, these bearings are the correct choice to bring the clearance back into specification. Always refer to your vehicle's service manual or your engine builder's recommendations for the precise oil clearance specifications when installing new bearings.