If you're serious about your engine's performance, you know that the right bearings can make all the difference. That's where these ACL Race Series Engine Bearings come into play. They’re not just any bearings; they’re crafted for those who push their engines to the limit. Designed specifically for high RPM conditions, these bearings are a solid choice for a wide range of popular 4, 6, and 8-cylinder engines.

What really sets these bearings apart is their unique blend of design and metallurgy. The high-strength overlay plate is thinner, which means it holds up better under stress. And with hardened steel backs on all the rod bearings, you get improved support for the bearing lining, which helps keep everything in place even when the engine is really revving. This isn’t just some marketing fluff; it’s about making sure your engine runs smoothly and reliably under pressure.

One of the standout features is the increased crush, which enhances bearing retention. You want your bearings to stay put, especially when you’re pushing your ride to its limits. Plus, they’ve eliminated flash plating on the backs, which not only improves heat transfer but also maximizes the grip between the bearings and their housing. That means better performance and less worry about overheating.

These bearings also come with increased eccentricity, a nifty feature that compensates for any bore distortion you might encounter at high RPM. It helps form hydrodynamic oil films, which is crucial for keeping everything lubricated and running smoothly. And let’s not forget about the 3/4 grooved main bearings—they optimize the load-carrying surface area and oil flow to the conrod bearings, making sure everything gets the lubrication it needs.

With tight and consistent wall tolerances, you can maintain those crucial clearances without any guesswork. Plus, they’ve got enlarged ID chamfers where it counts, accommodating those larger fillet radii on performance crankshafts. It’s all in the details, right?

Now, for the specs: you can find these bearings in sizes like STD, .025, .25, and .50, with standard oil clearance and identical halves. The tri-metal construction with hardened steel backs means they’re built to last. If you’re working with specific shaft sizes, these bearings fit snugly between 1.8802 in and 1.8810 in, with tunnel sizes ranging from 1.9921 in to 1.9929 in. And they’ve got a max wall thickness of 0.0553 in, making them robust enough for serious performance builds.

These bearings are a perfect fit for a variety of Audi models, including the A3 from 1998 to 2009, the A4 from 1996 to 2013 and 2015 to 2022, the A4 Quattro from 2017 to 2019, and the Q3 from 2019. So if you’re looking to enhance your ride’s performance, these ACL Race Series Engine Bearings are definitely worth considering.