Alright, let’s talk about the ACL Race Series Engine Bearings. If you’re pushing your engine hard, whether it’s on the street or the track, these bearings are worth your attention. They’re crafted with a unique blend of design and metallurgy that really stands out in the high-performance crowd. Designed to handle those higher RPMs, they’re perfect for a variety of setups, especially if you’re running a 4, 6, or 8-cylinder engine.

What makes these bearings special?

• First off, they’ve got a high-strength overlay plate that’s thinner than what you might find elsewhere. This helps with fatigue resistance, so you can really push your engine without worrying about wear.
• All the rod bearings come with hardened steel backs. This isn’t just for show—it improves support for the bearing lining and keeps everything locked in place within the housing.
• You’ll notice an increased crush on these bearings, which really helps with retention. That means they stay put when the heat is on.
• They’ve eliminated flash plating on the backs, which is a game-changer for heat transfer. This means they dissipate heat better, helping maintain grip between the bearings and the housing.
• With increased eccentricity, these bearings can handle bore distortion at high RPMs. This is crucial for forming those hydrodynamic oil films that keep everything running smoothly.
• The 3/4 grooved main bearings optimize the load-carrying surface area and improve oil flow to the conrod bearings. More oil where it’s needed? Yes, please!
• Tight wall tolerances ensure consistent clearances, so you don’t have to second-guess your setup.
• Finally, they’ve got enlarged ID chamfers on the edges where necessary, which is a nice touch for performance crankshafts with larger fillet radii.

Now, let’s get into the nitty-gritty specs:

• Sizes available: STD, .025, .25, and .50
• Oil clearance is standard, which should fit most setups without a hitch.
• Half type? You’re looking at identical halves here.
• Material? Tri-metal with hardened steel backs, so you know they’re built to last.
• Min standard shaft size is 2.1636 inches (54.956 mm) and max is 2.1646 inches (54.980 mm).
• For tunnel sizes, you’ve got a min of 2.3206 inches (58.944 mm) and max of 2.3216 inches (58.968 mm).
• Max wall thickness at the crown is 0.0780 inches (1.980 mm).
• And the max overall length? That’s 0.752 inches (19.10 mm).

What vehicles do these fit?

These bearings are a solid choice for the Nissan NX from 1991 to 1996 and the Nissan Sentra from 1982 to 2018. Specifically, if you’re running a Nissan SR20DE/DET (2.0L) with a 0.50mm oversized main bearing set, you’re in luck!

So, if you’re looking to beef up your engine’s internals and want something that can really stand up to the demands of performance driving, give these ACL Race Series Engine Bearings a shot. They’re built for the serious enthusiast who knows what they need.