BMW M40 M42 M43, ACL Race Series Main Bearings (5M1538H)
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BMW M40 M42 M43 ACL Race Series Main Bearings (5M1538H)
Enhance your BMW's performance with the ACL Race Series Main Bearings, specifically designed for the M40, M42, and M43 engines. These bearings are engineered to endure higher RPM conditions, making them ideal for racing and high-performance applications. Crafted with precision, they ensure durability and reliability under extreme conditions.
Key Features:
- High strength overlay plate with reduced thickness for enhanced durability
- Hardened steel backs on all Conrod Bearings for superior strength
- Increased crush and elimination of flash plating for improved performance
- 3/4 grooving on Main Bearings for optimum oil supply
- Tight, consistent wall tolerances for precision fit
- Oversize chamfers where applicable for better oil flow
Explore the full range of ACL Race Series Engine Bearings to find the perfect fit for your vehicle.
| Product Name | BMW M40 M42 M43, ACL Race Series Main Bearings (5M1538H) |
|---|---|
| Brands | ACL |
| Engine | M40 / M42 / M43 / M44 |
| Make | BMW |
Delivery & Freight
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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 benefits of using ACL Race Series Main Bearings in my BMW M40/M42/M43 engine?
ACL Race Series Main Bearings are designed for high-performance applications, providing enhanced durability and reliability under extreme conditions. Their high strength overlay plate and hardened steel backs ensure they can withstand higher RPMs, making them ideal for racing and spirited driving.
Do I need to modify my engine block to fit these main bearings?
Typically, these main bearings are designed to fit the M40, M42, and M43 engines without modification. However, it is essential to check the block for any wear or damage and ensure that the bearing clearances are within the manufacturer's specifications for optimal performance.
What should I consider regarding oil clearance when installing these main bearings?
When installing ACL Race Series Main Bearings, it is crucial to measure and set the oil clearance accurately. This ensures proper lubrication and prevents premature wear. Consult the engine builder's specifications and consider the intended use of the engine when determining the appropriate clearance.
Are these main bearings suitable for street use, or are they strictly for racing?
While ACL Race Series Main Bearings are engineered for high-performance and racing applications, they can also be used in street engines that require enhanced durability. However, keep in mind that they are designed for higher RPM conditions, so ensure your engine is set up to handle the demands.
What is the significance of the 3/4 grooving on these main bearings?
The 3/4 grooving on ACL Race Series Main Bearings optimises oil supply to the bearings, ensuring better lubrication and cooling under high-stress conditions. This design feature helps maintain performance and reliability, especially in racing scenarios where oil flow is critical.