If you’re pushing your ride to the limits, you know how crucial it is to have the right engine bearings. That’s where the ACL Race Series Engine Bearings come into play. These aren’t just any bearings; they’re built to handle the high RPMs that come with serious performance driving. Whether you’re running a 4, 6, or 8-cylinder setup, these bad boys have got you covered.

What sets these bearings apart? For starters, the high-strength overlay plate is thinner, which might sound like a small detail, but it actually helps improve fatigue properties. That means you can rev higher without worrying about them giving out on you. Plus, the hardened steel backs on all rod bearings offer solid support for the bearing lining, ensuring they stay put in the housing even under extreme conditions.

Speaking of support, the increased crush on these bearings enhances retention, so you won’t have to stress about them shifting around. And they’ve eliminated flash plating on the back, which not only boosts heat transfer but also maximizes the grip between the bearings and their housing. That’s a win-win if you ask me.

Now, let’s talk about eccentricity. It’s a fancy term, but in this case, it means these bearings are designed to compensate for bore distortion at high RPMs. This helps in forming hydrodynamic oil films, which is essential for keeping everything running smoothly. The 3/4 grooved main bearings optimize the load-carrying surface area and oil flow to the conrod bearings, ensuring that everything stays well-lubricated when you’re pushing your engine hard.

With tight and consistent wall tolerances, you can maintain precise clearances, which is vital for performance. They’ve even enlarged the ID chamfers on the bearing edges to accommodate those larger fillet radii found on performance crankshafts. It’s all about the details, right?

Now, if you’re curious about the specs, here’s what you need to know:

• Size: STD
• Oil Clearance: +0.001" Extra
• Half Type: Upper & Lower
• Material: Tri-metal with hardened steel backs
• Min Std Shaft Size: 1.9661in / 49.938mm
• Max Std Shaft Size: 1.9668in / 49.956mm
• Min Std Tunnel Size: 2.1259in / 53.998mm
• Max Std Tunnel Size: 2.1267in / 54.018mm
• Max Wall at Crown: 0.0787in / 2mm
• Max Overall Length: 0.6941in / 17.63mm

These bearings fit a range of vehicles, including the Mazda 323 from 1986 to 2003 and the Mazda Protege from 1990 to 2003. If you’re looking to upgrade your engine with some serious performance parts, the ACL Race Series Engine Bearings are definitely worth a look. They’re built for those who take their driving seriously and want to push their engines to the max without compromising reliability.