BMW M40 M42 M43 SOHC 2V, ACL Race Series Conrod Bearings (4B1490H)
Enhance your BMW's performance with the ACL Race Series Conrod Bearings, specifically engineered for the M40, M42, and M43 SOHC 2V engines. These bearings are designed 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.
High strength overlay plate with reduced thickness for superior performance
Hardened steel backs on all Conrod Bearings for enhanced durability
Increased crush and elimination of flash plating for improved fit
3/4 grooving on Main Bearings for optimal oil supply
Tight, consistent wall tolerances for precision fit
Oversize chamfers where applicable for better oil flow
More Information
Product Name
BMW M40 M42 M43 SOHC 2V, ACL Race Series Conrod Bearings (4B1490H)
Brands
ACL
Engine
M40 / M42 / M43 / M44
Make
BMW
Delivery & Freight
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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 Conrod Bearings for BMW M40/M42/M43 engines?
The ACL Race Series Conrod Bearings for BMW M40, M42, and M43 engines feature a high strength overlay plate with reduced thickness for improved performance. They have hardened steel backs for enhanced durability, increased crush to eliminate flash plating for a better fit, and tight wall tolerances for precision. Additionally, they include oversize chamfers where applicable to facilitate better oil flow.
What RPM range are these conrod bearings suitable for?
These conrod bearings are specifically designed for high-performance applications and can endure higher RPM conditions, making them suitable for racing and spirited driving. However, the actual reliability at elevated RPMs will depend on proper installation, machining, and engine tuning.
Do I need to modify my engine for these conrod bearings?
While the ACL Race Series Conrod Bearings are designed to fit the M40, M42, and M43 engines, it is crucial to ensure that your engine's conrod big ends are properly honed to match the bearings. This ensures optimal fit and performance. Always consult with a qualified engine builder for specific machining requirements.
How do these bearings perform under extreme conditions?
These conrod bearings are engineered to withstand extreme conditions, making them ideal for racing environments. Their design features, such as the hardened steel backs and high strength overlay, contribute to their durability and reliability under high load and temperature situations. However, proper lubrication and maintenance are essential to maximise their lifespan.
What should I consider when installing these conrod bearings?
When installing the ACL Race Series Conrod Bearings, ensure that the bearing surfaces are clean and free of debris. It's also important to check the bearing clearances with a micrometer or dial gauge to ensure they are within the manufacturer's specifications. Proper torqueing of conrod bolts is critical for maintaining bearing integrity, so follow the recommended torque specifications for your specific application.
