BRIAN CROWER BC5329LW Billet Crankshaft S58B30T0 100.6MM 4340

( Brand: Brian Crower ), ( Manufacturer Part Number: BC5329LW ), ( Part Type: Crankshaft ), ( Air Freight Prohibited: False )

Review BRIAN CROWER Bmw 100.6mm Stroke 4340 Billet Lightweight Crankshaft

The **Brian Crower BC5329LW** is a meticulously engineered, high-performance billet crankshaft designed exclusively for BMW s legendary **S58B30T0** engine, the powerhouse behind the M5 (E39), M3 (E46), and Z3 M Roadster. Crafted from **4340 billet steel**, this crankshaft represents the pinnacle of precision machining and aerospace-grade metallurgy, ensuring unparalleled strength, durability, and performance. With a **100.6mm stroke**, it optimizes displacement while maintaining a balanced, high-revving characteristic that enthusiasts and racers demand. The **fully counterweighted design** minimizes vibration, allowing for aggressive power delivery and extended engine life under extreme conditions, whether on the track or in high-performance street applications. Brian Crower s reputation for innovation is evident in the **optimized journal and main bearing surfaces**, which reduce friction and enhance oil flow, contributing to improved efficiency and longevity. This crankshaft is not merely an upgrade it s a **performance catalyst**, transforming stock S58 engines into high-revving, torque-rich beasts capable of handling the demands of forced induction, nitrous, or even turbocharging with ease. Whether you're chasing top-end horsepower, seeking a more linear powerband, or simply looking to future-proof your engine, the BC5329LW delivers a **quantum leap in structural integrity and performance**, making it a must-have for serious S58 builders and tuners.

The **Brian Crower BC5329LW** is a high-performance billet crankshaft designed for the **BMW S58 (B30T0) engine**, specifically tuned for high-RPM applications like track use or forced induction builds. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the BC5329LW Crankshaft**

1. **Billet Construction for Strength and Durability**

The crank is machined from a single billet of **4340 chromoly steel**, which offers superior strength-to-weight ratio compared to cast cranks. This reduces weight while maintaining (or improving) rigidity, which is critical for high-RPM operation. The lack of internal porosity (common in castings) also reduces the risk of catastrophic failure under extreme stress.

2. **Optimized for High RPM and Forced Induction**

The **100.6mm stroke** is a common choice for S58 builds, balancing power delivery with durability. The crank s design is tuned for **high-RPM performance**, making it ideal for turbocharged or supercharged applications where peak power occurs at elevated RPMs. The balanced weight distribution helps reduce vibration, improving drivability and longevity under heavy loads.

3. **Precision Machining and Balancing**

Billet cranks undergo **CNC machining and dynamic balancing**, ensuring minimal vibration and consistent performance. This is particularly important for engines running at high loads, where even slight imbalances can lead to premature wear in bearings or rods.

4. **Compatibility with S58 Modifications**

The BC5329LW is designed specifically for the **S58 platform**, meaning it integrates seamlessly with stock or aftermarket components (e.g., pistons, rods, and bearings). It is often paired with **forged rods** and **high-performance pistons** to handle increased power outputs, making it a versatile choice for builds ranging from mild to extreme.

5. **Aftermarket Support and Tuning Potential**

Brian Crower cranks are widely used in the tuning community, so there is extensive **tuning data and support** available. Many ECU tuners (e.g., Haltech, Link, or custom maps) have experience with this crank, allowing for optimized power delivery without excessive stress.

6. **Reduced Risk of Rod Bending or Failure**

Compared to stock cranks, billet cranks like the BC5329LW are less prone to **rod bending or crankshaft failure** under high torque or RPM. This is especially valuable for engines running **boosted or naturally aspirated at high power levels**.

7. **Long-Term Reliability for Track Use**

If the engine is properly supported with **high-quality bearings, rods, and lubrication**, a billet crank can significantly extend the life of the drivetrain. Many S58 builds using this crank achieve **100,000 miles** with proper maintenance, even under aggressive driving conditions.

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### **Cons of the BC5329LW Crankshaft**

1. **High Upfront Cost**

Billet cranks are **significantly more expensive** than stock or aftermarket cast cranks. The BC5329LW typically costs **$2,500 $4,000 **, depending on the supplier and additional services (e.g., balancing, rod matching). This makes it a **non-starter for budget builds** or mild power upgrades.

2. **Requires Supporting Modifications**

- **Connecting rods** (forged, e.g., ARP, JE, or Brian Crower rods)

- **Pistons** (forged or high-performance cast, e.g., Mahle, JE, or Wiseco)

- **Bearings** (high-capacity, e.g., Shell, Mahle, or Fel-Pro)

- **Rod bolts** (ARP or similar high-strength fasteners)

- **Oil pump and oil system** (to handle increased lubrication demands)

- **ECU tuning** (to prevent excessive stress)

Failing to do so can lead to **premature failure** of other components, negating the crank s benefits.

3. **Installation Complexity**

Installing a billet crank requires **specialized tools, experience, and often a press or arbor press** to remove the old crank and install the new one. If not done correctly, damage to the block or crankshaft can occur. Many builders opt to have it installed by a **trusted machine shop or BMW specialist**.

4. **Limited Stock Compatibility**

While the BC5329LW is designed for the S58, some **stock components (e.g., oil pump, rod bearings, or main caps)** may not be sufficient for high-power applications. Upgrades are often necessary, adding to the cost and complexity.

5. **Potential for Overkill on Mild Builds**

If your goal is **modest power gains (e.g., 500 700 hp naturally aspirated or mild turbo)**, a billet crank may be **overkill**. A **high-quality aftermarket cast crank** (e.g., Eagle, Scat, or JE) could achieve similar results at a fraction of the cost. A billet crank is best suited for **aggressive builds (800 hp) or track-focused engines**.

6. **Maintenance and Lubrication Demands**

High-performance cranks generate more heat and stress, requiring **premium motor oil (e.g., Mobil 1 ESP, Pennzoil Platinum, or synthetic blends)** and **regular oil changes**. Neglecting lubrication can lead to **bearing wear or crankshaft fatigue**.

7. **Risk of Voiding Warranty (If Applicable)**

If you plan to keep the car **stock or lightly modified**, installing a billet crank may void **factory warranties** on the engine or drivetrain. This is particularly relevant if the vehicle is still under manufacturer-backed coverage.

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### **Conclusion**

The **Brian Crower BC5329LW billet crankshaft** is one of the best choices for **high-performance S58 builds**, especially those targeting **forced induction or extreme power levels (800 hp)**. Its **billet construction, high-RPM tuning, and compatibility with aftermarket components** make it a **reliable and durable** option for track or daily-driver builds where longevity and performance are prioritized.

However, it is **not a "one-size-fits-all" solution**. The high cost, **requirement for supporting modifications**, and **complex installation** mean it is best suited for **serious builders** who are committed to a **high-power or track-focused engine**. For **mild to moderate power upgrades**, a **high-quality aftermarket cast crank** may offer similar benefits at a lower cost.

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### **Recommendation**

- **Forged rods** (e.g., ARP, JE, or Brian Crower)

- **Forged pistons** (e.g., Mahle, JE, or Wiseco)

- **High-capacity bearings** (e.g., Shell, Mahle, or Fel-Pro)

- **ARP or equivalent rod bolts**

- **Upgraded oil pump and oil system**

- **ECU tuning** (custom or Haltech/Link)

- **Budget accordingly** expect to spend **$5,000 $10,000 ** for a complete bottom-end upgrade.

- Consider a **high-quality aftermarket cast crank** (e.g., **Eagle 100.6mm, Scat 100.6mm, or JE 100.6mm**) as a **more cost-effective alternative**.

- These cranks can handle **substantial power** while being **less expensive** than billet options.

- **Stick with the stock crank** (if well-maintained) or a **rebuilt stock crank** from a reputable shop.

- Focus upgrades on **intake, exhaust, and ECU tuning** rather than the bottom end.

- **Consult a BMW performance specialist or engine builder** before committing. They can assess your goals and recommend whether a billet crank is necessary or if a cast alternative would suffice.

The **BC5329LW is the best choice for high-end S58 builds** where **durability, high RPM, and forced induction** are priorities. However, it is **not a "set-and-forget" upgrade** it demands **proper supporting components and tuning** to perform reliably. For less aggressive builds, a **cast crank or stock crank with maintenance** may be a smarter investment.

Details:

Brian Crower BMW S58B30T0 100.6mm Stroke 4340 Billet Lightweight Crankshaft.

part #: bc5329lw prices

• $1977.15-$5620.65

specifications cranshafengin:

• for makes: Bmw
• brand: Brian Crower
• mpn: Bc5329lw
• part type: Crankshaft
• air freight prohibited: False

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• options: Ship-to-home
• quantity: 1
• sold: 0
• started: June 10, 2026
• availability: In Stock

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• condition: New
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

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