Alright, let’s talk about the ACL Race Series Engine Bearings. If you’re pushing your engine to the limits—whether you're tearing up the track or just want your daily driver to perform like a champ—these bearings are worth a look. They’re built for folks who know what high performance really means, and they don’t skimp on the details.

What sets these bearings apart? For starters, they’ve got a high-strength overlay plate that's thinner than what you might find on your average bearing. This means they handle fatigue better, especially when you're revving high. And if you’re worried about the bearings staying put, the hardened steel backs on the rod bearings really help with that. They provide solid support for the lining and keep everything snug in the housing.

But it doesn’t stop there. The increased crush on these bearings enhances retention, so you can trust they won’t be going anywhere during those intense drives. Plus, they’ve done away with flash plating on the back, which is a game-changer for heat transfer. This helps keep things cool and maximizes the grip between the bearings and the housing.

One of the coolest features is the increased eccentricity. This is a fancy way of saying they compensate for any bore distortion at high RPMs, helping to form those all-important hydrodynamic oil films. And for main bearings? They come with a 3/4 groove design that optimizes the load-carrying surface area and oil flow to the conrod bearings. It’s all about keeping your engine running smoothly under pressure.

Let’s get into some specs. These bearings come in standard sizes (STD, .25, .50) with standard oil clearance, which is pretty much what you want for most setups. They’re made from tri-metal hardened steel backs, and they fit a range of Audi models, including:

• Audi A3 (1998-2009)
• Audi A4 (1996-2013 & 2015-2022)
• Audi A4 Quattro (2017-2019)
• Audi Q3 (2019)

For those who need specific measurements, you’re looking at a minimum standard shaft size of 2.1243 inches and a maximum of 2.1251 inches. The tunnel sizes range from 2.3228 inches to 2.3236 inches. And if you’re curious about the wall thickness, it maxes out at 0.0985 inches. All this means you’re getting a tight, consistent fit that helps maintain those critical clearances.

So, if you’re ready to take your engine to the next level, these ACL Race Series Engine Bearings might just be what you need. They’re designed for performance and built to last, making them a solid choice for anyone serious about their ride.