If you're diving into the world of high-performance engines, you know that the right bearings can make a huge difference. That’s where these ACL Race Series Engine Bearings come into play. They’re not just another set of bearings; they're designed specifically for those of us who push our engines to their limits. Whether you’re revving up a 4, 6, or 8-cylinder beast, these bearings are built to handle the heat of higher RPMs without breaking a sweat.

Let’s break down what makes these bearings stand out:

• High Strength Overlay Plate: They’ve reduced the thickness here, which means better fatigue properties. Less weight, more strength—what’s not to love?
• Hardened Steel Backs: Every rod bearing has a hardened steel back to keep everything locked in place. This helps with bearing retention and gives you peace of mind when you’re pushing your engine hard.
• Increased Crush: This feature really helps keep the bearings snug in their housing, so you don’t have to worry about them shifting around when the engine’s roaring.
• Heat Transfer: They’ve eliminated flash plating on the back, which means heat moves through the bearings better. This helps keep everything cool and maximizes grip in the housing.
• Increased Eccentricity: This is a fancy way of saying they’re designed to handle bore distortion at high RPMs. It helps form hydrodynamic oil films, keeping everything lubricated and running smoothly.
• 3/4 Grooved Main Bearings: These are made to optimize load carrying and oil flow to the conrod bearings, which is crucial for performance engines.
• Tight Wall Tolerances: Consistent clearances are key, and these bearings deliver just that.
• Enlarged ID Chamfers: This allows for better fit on performance crankshafts, especially those with larger fillet radii.

Now, let’s talk specs. These bearings come in a standard size, with an oil clearance of +0.001" extra. They’re made from tri-metal with hardened steel backs, and they fit perfectly in the following:

• Audi A3 (1998-2009): Specifically for the 4B1609HX-STD model, these are a great match for your 1781cc Turbo & 1984cc DOHC/Turbo engines.

Here’s a quick look at the specs:

• Min Std Shaft Size: 1.8802in / 47.758mm
• Max Std Shaft Size: 1.8810in / 47.778mm
• Min Std Tunnel Size: 1.9921in / 50.600mm
• Max Std Tunnel Size: 1.9929in / 50.619mm
• Max Wall at Crown: 0.0548in / 1.392mm
• Max Overall Length: 0.748in / 19.00mm

Oh, and just a heads up: these bearings come with one oil hole and no notch. So, if you’re looking to upgrade your Audi’s engine and want something that’s built to last while performing at high RPMs, these bearings are worth considering. They’ve got the features and the durability to keep your engine running strong, even when you’re pushing it to the limit.