MAIN BEARING SET - STD, .025, .25

High performance Trimetal engine bearings

Designed to withstand higher RPM conditions

High strength overlay plate with reduced thickness for improved fatigue properties

Size: STD, .025, .25

Oil Clearance: Standard

Half Type: Identical Halves

Material: Tri-metal Hardened steel backs

Min Std Shaft Size: 1.9281in / 48.975mm

Max Std Shaft Size: 1.9288in / 48.991mm

Min Std Tunnel Size: 2.0866in / 53.000mm

Max Std Tunnel Size: 2.0872in / 53.015mm

Max Wall at Crown: Std: 0.0785in / 1.993mm

Max Overall Length: 0.630in / 16.00mm

 

Other Part Numbers:

ACL 6B1510H-STD

M140i, M240i, 340i, M340i, 440i, 540i, Supra A90

When doing rods and pistons, it’s a good idea to replace the rod bearings as well. ACL’s high-quality rod bearings will prevent fatigue, failure, and reduce drivetrain stress through their durable and strong design.

Race series bearing features:

Designed to withstand higher RPM conditions.

High strength overlay plate with reduced thickness for improved fatigue properties.

Hardened steel backs on all rod bearings to improve the support of the bearing lining and assist with bearing retention in the housing.

Increased crush for improved bearing retention.

Elimination of flash plating on the back of the bearings to improve heat transfer through the bearing sand to maximize the grip between the bearings and its housing.

Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films.

3/4 grooved Main Bearings to optimize bearing load carrying surface area and oil flow to the conrod bearings.

Tight consistent wall tolerances to help you maintain consistent clearances.

Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts.