ACL Race Series Engine Bearings - 4B8351A-STD

For those who push their engines to the limit, the ACL Race Series Engine Bearings (part number 4B8351A-STD) are engineered to meet the demands of high-performance driving. These bearings are specifically designed for a variety of popular 4, 6, and 8-cylinder applications, making them a great choice for owners of vehicles like the 1986-2003 Mazda 323 and 1990-2003 Mazda Protege. With a unique blend of advanced design, metallurgy, and engineering, these bearings provide the reliability and performance that serious drivers expect.

Key Features

• High-strength overlay plate with reduced thickness enhances fatigue resistance, ensuring longevity under high RPM conditions.
• Hardened steel backs on all rod bearings improve support for the bearing lining, enhancing retention in the housing.
• Increased crush for better bearing retention during extreme performance scenarios.
• Elimination of flash plating on the back of the bearings optimizes heat transfer and maximizes grip between the bearings and housing.
• Increased eccentricity compensates for bore distortion at high RPM, aiding in the formation of hydrodynamic oil films.
• 3/4 grooved main bearings optimize load-bearing surface area and oil flow to the connecting rod bearings.
• Tight wall tolerances maintain consistent clearances, crucial for high-performance applications.
• Enlarged ID chamfers accommodate larger fillet radii on performance crankshafts.

Technical Specifications

• Sizes Available: STD, .025, .25, .50
• Oil Clearance: Standard
• Half Type: Upper & Lower
• Material: Tri-metal with Hardened Steel Backs
• Min Standard Shaft Size: 1.7693 in / 44.94 mm
• Max Standard Shaft Size: 1.7699 in / 44.956 mm
• Min Standard Tunnel Size: 1.8896 in / 47.996 mm
• Max Standard Tunnel Size: 1.8904 in / 48.016 mm
• Max Wall at Crown: 0.0596 in / 1.515 mm
• Max Overall Length: 0.6693 in / 17 mm

Customer Feedback

Owners of the 1995 Mazda Protege have noted significant improvements in engine performance after installing the ACL Race Series bearings. One user stated, “After swapping to these bearings, my engine runs smoother at high RPMs, and I can feel the difference during hard acceleration.” Another Mazda 323 owner remarked, “These bearings fit perfectly and gave me the confidence to push my engine harder without worrying about wear.”

Fitment

The ACL 4B8351A-STD bearings are compatible with:

• Mazda 323 (1986-2003)
• Mazda Protege (1990-2003)

Upgrade your engine's reliability and performance with ACL Race Series Engine Bearings. Designed for those who demand the best from their vehicles, these bearings are a perfect match for your Mazda's high-performance needs.