Two versions of N57 crankshaft. Have you chosen the right one for your car?

About BMW N57 crankshafts, there are two versions, 4 counterweights and 8 counterweights. Let's deplore them in detail.

1.Differences and Applications

• 4-counterweight version:

With fewer counterweights, it has weaker balancing performance and may produce more vibration at high RPM or under heavy load. It is typically used in low- or medium-power N57 engine variants and is suitable for daily driving or low-load conditions.

 

• 8-counterweight version:

With more counterweights, it offers better balancing performance, making it suitable for high-RPM and high-load operation. It effectively reduces vibration and is typically used in high-power or high-performance N57 engine variants. It is ideal for high-load, high-RPM, or high-performance scenarios, such as the N57D30TOP (high-power variant) or engines equipped in M Performance models.

 

 

2. How to Determine Which Version to Use?

① Engine Model and Power Output:

Low-power variants (e.g., 184 HP, 245 HP) typically use the 4-counterweight version.
High-power variants (e.g., 286 HP, 313 HP, 340 HP) typically use the 8-counterweight version.

② Vehicle VIN or Engine Label:

Check the specific configuration using the vehicle's VIN or engine label.

③ Crankshaft Part Number:

The part numbers for the 4-counterweight and 8-counterweight crankshafts are different, allowing direct identification. For example:

11217799970 usually refers to the 8-counterweight N57 crankshaft.

11217812954 usually refers to the 4-counterweight N57 crankshaft.

④ Repair Manual or Official Documentation:

Refer to the official BMW repair manual or consult an authorized dealer for guidance.

3. Important Notes

① Compatibility:

When replacing the crankshaft, ensure it is compatible with other engine components (e.g., pistons, connecting rods, flywheel, etc.).

② Performance Requirements:

If the vehicle requires higher performance or frequently operates under heavy loads, it is recommended to use the 8-counterweight crankshaft.

③ Professional Advice:

When performing replacements or repairs, consult a professional technician or refer to official technical documentation.

 

In conclusion, 

 

4-counterweight version: Suitable for low- or medium-power variants, with a simpler design and lower cost.

8-counterweight version: Suitable for high-power or high-performance variants, offering better balance and ideal for high-load operation.

 

When making a selection, confirm based on the engine model, power requirements, and part numbers to ensure compatibility and meet performance needs.

(Good news! STEM's 4-counterweight N57 crankshaft is currently in full production and will soon be available to meet the needs of more customers! Let's look forward to it)