BMW N54/N55/S55B30 Inline 6 ACL Race Series Main Bearings (7M1397H)
Enhance the performance of your BMW N54, N55, or S55B30 engine with the ACL Race Series Main Bearings, designed specifically for high RPM conditions. These bearings are engineered to deliver superior durability and reliability, making them an ideal choice for racing enthusiasts and performance-driven drivers.
High Strength Overlay Plate: Features a reduced thickness for improved performance.
Hardened Steel Backs: Ensures durability on all Conrod Bearings.
Increased Crush: Eliminates flash plating for a more secure fit.
3/4 Grooving: Provides optimum oil supply to the Main Bearings.
Consistent Wall Tolerances: Ensures precision and reliability.
Oversize Chamfers: Available where applicable for enhanced fitment.
Explore the full range of ACL Race Series Engine Bearings for unmatched performance and reliability. Visit ACL Race Series Engine Bearings for more information.
More Information
Product Name
BMW N54/N55/S55B30 INLINE 6, ACL Race Series Main Bearings (7M1397H)
Brands
ACL
Engine
N55B30 - S55B30
Make
BMW
Delivery & Freight
We are an Australian-based company that ships items nationally and internationally, usually within 48 hours of receiving your order. High-value items shipped internationally are sent via DHL Express, while lower-value items are sent via Australia Post Express unless otherwise instructed.
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Disclaimer:
Product images are for description purposes only. Actual product may vary.
What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What are the key features of the ACL Race Series Main Bearings for the BMW N54/N55/S55B30?
The ACL Race Series Main Bearings feature a high strength overlay plate with reduced thickness for improved performance, hardened steel backs for durability, and increased crush to eliminate flash plating. They also have 3/4 grooving for optimal oil supply and consistent wall tolerances for precision.
Do I need to modify my engine for these main bearings?
While the ACL Race Series Main Bearings are designed for a direct fit, it's essential to check your engine's main journal sizes and ensure proper machining if necessary. Always verify that the bearing clearances are within the recommended specifications for your specific application.
What RPM range are these main bearings suitable for?
These bearings are engineered for high RPM conditions, making them suitable for performance applications such as racing. However, the reliability at high RPMs will depend on proper installation, clearances, and overall engine tuning.
How do I ensure proper fitment of the ACL Race Series Main Bearings?
To ensure proper fitment, confirm that the main caps are line-bored after installation, and check that the bearing surfaces are clean and free of debris. It's also crucial to measure the bearing clearances accurately before final assembly.
What oil should I use with these main bearings?
For optimal performance with ACL Race Series Main Bearings, use a high-quality synthetic oil that meets or exceeds the specifications for your BMW N54/N55/S55B30 engine. Proper oil viscosity is critical for maintaining lubrication and reducing wear, especially under high RPM conditions.
