ACL Race Series Engine Bearings - 4M2505H-STD

If you're a proud owner of a Nissan GTR (2009-2021), you know that performance and reliability go hand in hand. The ACL 4M2505H-STD Race Series Engine Bearings are specifically engineered for high RPM applications, ensuring that your engine can handle the demands of both the street and the track. With a unique combination of advanced design, metallurgy, and engineering, these Trimetal engine bearings deliver the durability and performance that serious drivers expect.

Features

• High-strength overlay plate with reduced thickness enhances fatigue resistance, allowing your engine to push the limits.
• Hardened steel backs on all rod bearings provide superior support for the bearing lining while ensuring secure retention within the housing.
• Increased crush for improved bearing retention, crucial for maintaining performance under high-stress conditions.
• Removal of flash plating on the back of the bearings enhances heat transfer, maximizing grip between the bearings and their housing.
• Optimized eccentricity compensates for bore distortion at high RPM, aiding in the formation of hydrodynamic oil films for better lubrication.
• 3/4 grooved main bearings maximize load-carrying surface area and improve oil flow to the conrod bearings, keeping your engine running smoothly.
• Tight, consistent wall tolerances help maintain precise clearances, which is essential for performance tuning.
• Enlarged ID chamfers on bearing edges accommodate large fillet radii on performance crankshafts, ensuring compatibility and performance.

Specifications

• Standard Sizes: Std-0, Std-1, Std-2
• Oil Clearance: Standard (Graded)
• Half Type: Identical Halves
• Material: Tri-metal with hardened steel backs
• Min Standard Shaft Size: 2.2025 in / 55.943 mm
• Max Standard Shaft Size: 2.2032 in / 55.961 mm
• Min Standard Tunnel Size: 2.3228 in / 59.000 mm
• Max Standard Tunnel Size: 2.3233 in / 59.013 mm
• Max Wall at Crown:
  • Std-0: 1.500-1.504 mm / 0.0591-0.0592 in
  • Std-1: 1.505-1.509 mm / 0.0593-0.0594 in
  • Std-2: 1.510-1.514 mm / 0.0594-0.0596 in
• Max Overall Length: 0.748 in / 19 mm

Customer Feedback

One GTR owner shared, "I installed the ACL 4M2505H-STD bearings during my last rebuild, and I couldn't be happier. The fit was perfect, and after a few track days, I noticed a significant improvement in oil pressure and overall engine response. These bearings are a must for anyone serious about performance!"

Perfect Fit for Your GTR

When it comes to upgrading your Nissan GTR, the ACL 4M2505H-STD Race Series Engine Bearings are a crucial component for those looking to push their engines to new heights. With their robust design and precise engineering, these bearings are built to withstand the rigors of high-performance driving. Don't compromise on quality—equip your GTR with the best to ensure longevity and reliability.