If you’re diving into the world of high-performance engines, you’ve probably heard about the ACL Race Series Engine Bearings. These bad boys are not just another set of bearings; they’re crafted from a unique blend of design, metallurgy, and engineering that really delivers when it comes to pushing your engine to its limits. Whether you’re working on a 4, 6, or 8-cylinder setup, these bearings are built to handle those higher RPMs without breaking a sweat.

What sets these bearings apart? For starters, they feature a high-strength overlay plate that’s thinner than your average bearing, which means improved fatigue properties. This is a game changer when you’re racing or just pushing your engine hard. The hardened steel backs on all the rod bearings provide solid support for the bearing lining and help keep everything securely in place in the housing, which is crucial when you’re hitting those high speeds.

And let’s talk about crush. These bearings have increased crush to enhance retention, which is something you’ll appreciate when you’re trying to keep everything locked down during intense conditions. Plus, they’ve ditched the flash plating on the backs, allowing for better heat transfer. This means your engine can run cooler, and you’ll get maximum grip between the bearings and their housing. That’s a win-win in my book.

Another cool feature is the increased eccentricity. This helps compensate for any bore distortion you might experience at high RPMs and aids in forming hydrodynamic oil films—essential for keeping everything running smoothly. The 3/4 grooved main bearings optimize the load-carrying surface area and improve oil flow to the conrod bearings, ensuring that everything stays lubricated when you need it most.

With tight and consistent wall tolerances, you can maintain precise clearances, which is critical for performance engines. And if you’re working with performance crankshafts, you’ll appreciate the enlarged ID chamfers on the bearing edges that accommodate larger fillet radii.

As for specs, these bearings come in sizes from STD to 1.0, so you can find the right fit for your setup. The materials used are tri-metal with hardened steel backs, giving you the durability you need. The minimum standard shaft size is 2.3607 inches, and the maximum is 2.3612 inches, while the tunnel sizes range from 2.5062 to 2.5068 inches. When it comes to wall thickness, you’re looking at a maximum of 0.0722 inches, with an overall length of 0.7480 inches.

These bearings are a perfect match for the Nissan 200SX from 1995 to 1998, specifically the 5M2747H-.50 ACL Nissan KA24DE Inline 4 with a .50mm oversized high-performance main bearing set. If you’re serious about your engine's performance, these bearings are worth considering. They’re built for the real world, just like your ride.