If you’re diving into the world of high-performance engines, you’ve probably heard of ACL’s Race Series Engine Bearings. These aren’t just any bearings; they’re built to handle the heat and stress of high RPMs, making them a solid choice for anyone looking to push their engine to the limit. Whether you’re working on a 4, 6, or 8-cylinder setup, these bearings have got you covered.

Why These Bearings Rock

• Durable Overlay: The high-strength overlay plate is thinner, which means it can take a beating without giving up on you. This design helps reduce fatigue, so you can keep your engine running strong.
• Solid Support: With hardened steel backs on all rod bearings, you get extra support for the bearing lining. This means better retention in the housing, which is crucial when you’re pushing your engine hard.
• Better Retention: The increased crush feature helps keep the bearings snug in their place, so you won’t have to worry about them shifting around when you’re revving high.
• Heat Transfer: They’ve eliminated flash plating on the back, which is a big win for heat transfer. This helps keep everything running cooler and maximizes the grip between the bearings and the housing.
• High RPM Ready: The increased eccentricity compensates for any bore distortion you might encounter at high RPMs, helping to form solid hydrodynamic oil films. This is what you want when you’re pushing your engine.
• Optimized Flow: The 3/4 grooved main bearings are designed to optimize oil flow to the conrod bearings, ensuring that everything stays lubricated even when the pressure is on.
• Consistent Clearances: With tight wall tolerances, you can maintain those critical clearances, which is key for performance engines.
• Performance Fit: Enlarged ID chamfers on the edges accommodate larger fillet radii on performance crankshafts, making installation a breeze.

Specifications You Need to Know

• Size: Available in STD, .025, and .25
• Oil Clearance: Standard
• Half Type: Identical Halves
• Material: Tri-metal with Hardened Steel Backs
• Min Standard Shaft Size: 1.888in / 47.956 mm
• Max Standard Shaft Size: 1.8887in / 47.974 mm
• Min Standard Tunnel Size: 2.0079in / 51.000mm
• Max Standard Tunnel Size: 2.0084in / 51.013 mm
• Max Wall at Crown: 0.0592in / 1.503 mm
• Max Overall Length: 0.673in / 17.10 mm

Specifically, if you’re working with a Nissan SR20DE/DET (2.0L), this standard size rod bearing set (4B2960H-STD) is 17mm wide and fits like a glove. If you're serious about your performance upgrades, these bearings are a smart investment for keeping your engine in top shape.