ACL BMW M3 (E90) S65 V8 Engine Standard Size High Performance Rod Bearing Set

ACL 8B1580HX-STD is a connecting-rod bearing set for the cataloged BMW S65B40 engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.

Engine Application

ACLs 2023 guide separates the S65B40 3999cc V8 application, using the 8B1580 rod set and 5M1581 main set, from the S85B50 4999cc V10 application, using the 10B1580 rod set and 6M1581 main set. Shared printed rod-shell dimensions do not make the complete V8 and V10 bearing sets interchangeable. Match the entire manufacturer part number to the engine.

The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.

Specifications

Quantity and Assembly Checks

Confirm the rod-bearing set contents and shell positions against the complete manufacturer number. The photo is representative of the part family.

Measure shaft journals, housing bores and assembled oil clearance using the engine builders specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.

Frequently Asked Questions

Is the year and model enough to choose this bearing? No. Match 8B1580HX-STD to the exact engine and measured build specification.

What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.

Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.

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