ACL Race Series Reinforced Rod Bearings - Mazda B6, BP (MX-5 NA & NB, 323)

Engineering Bulletin

ACL provides an official guide for clearance control and optimization, and guidelines for bearing size selection : download it here.

ACL Race Series Reinforced Rod Bearings

Designed to withstand high RPM, temperatures and load, these ACL Race Series bearings are manufactured from 3 layers of hardened steel, copper and nickel. This "trimetal" composition substantially lowers friction, and thus reduces the operating temperatures while providing superior lubrication.

To help engine builders optimise clearances for their specific applications, ACL provides a range of different bearing sizes for standard crankshaft journal sizes:

• H-STD: Bearing thickness is precision finished to provide a nominal clearance based on OEM specifications. Suitable for all applications using crankshafts finished to OEM specifications.
• HX-STD: Providing an extra .001" (0.025mm) of clearance over the H-STD size bearings. Suitable for high to extreme power applications where additional clearance is beneficial to part reliability.
• H-001 / H-.025: Providing a reduction of .001" (0.025mm) of clearance over the H-STD size bearings. Suitable for adjusting clearance to compensate for surface reconditioning (polishing) of crankshaft journals or the use of low viscosity lubricants.

Please note: there are also HD (with location dowel holes) and HXD (with location dowel holes and 0.025mm (0.001") extra clearance) part numbers, reserved for some connecting rod bearing applications only.

Application List & Engine Codes

• Ford/Laser, Mazda 323/DOHC 16v/ZMD
• Ford/Capri, Laser, Meteor/SOHC 8v/Mazda B6
• Ford/Capri, Laser, MX-5/DOHC 16v/Mazda B6D
• Ford/Capri, Laser/DOHC 16v/Mazda B6T
• Ford/Capri, Laser/SOHC 32v/Mazda B6Y
• Ford/Laser/SOHC 16v/Mazda BP
• Ford/Laser/DOHC 16v/Mazda BPD
• Ford/Laser/DOHC 16v/Mazda BP-T
• Mazda/323, MX-5 , Ford Capri, Laser/DOHC 16v/B6D
• Mazda/323 , Ford Capri, Laser/DOHC 16v Turbo/B6T
• Mazda/323 , Ford Laser/SOHC 16v/BP
• Mazda/Ford Laser/DOHC 16v/BP-T
• Mazda/323, Ford Laser/DOHC 16v/BPD
• Mazda/MX5/DOHC 16v/BP-Z3
• Mazda/MX5 SP/DOHC 16v Turbo/BP-Z3T
• Mazda/MX5/DOHC 16v/BP-4W
• Mazda/MX5/DOHC 16v/BP-ZE
• Mazda/323/DOHC/Ford ZMD
• Mazda/Protege/DOHC 16v/ZL-VE
• Mazda/Protege/DOHC 16v/ZM-DE
• Mazda/323, Ford Capri, Laser, Meteor/SOHC 8v/B6
• Mazda/323, Ford Capri, Laser, Meteor/SOHC 8v/B6F
• Mazda/323 , Ford Capri, Laser/SOHC 16v/B6-2E
• Mazda/323 , Ford Capri, Laser/SOHC 16v/B6-ME