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  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
  • Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks
Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks

Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks

  • 2 - 2 Pieces
    $1,980
  • >= 3 Pieces
    $1,900

Customization:

Customized logo（Min.Order: 3 pieces）
support customized stroke, size and counterweight（Min.Order: 3 pieces）
View product details

Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • High-Performance Engine Support: Designed to withstand extreme stress and temperatures in BMW M5/M6 V10 S85/S85B50 engines, converting linear piston motion into rotational power for enhanced engine efficiency.
  • Durability & Balance: Engineered with high-strength 4340 steel and precision counterweights to reduce vibration, ensuring smooth operation and extended component longevity under high-performance conditions.

Key features

  • 1. Material Technology

    • With 4340 high-strength steel construction, this crankshaft delivers exceptional durability and resistance to extreme stress and temperatures, outperforming cast iron alternatives*.

  • 2. Interactive Design

    • With precision-engineered counterweights and balanced design, it reduces vibration and enhances engine stability during high-performance operation, minimizing wear on critical components*.

  • 3. Performance Parameters

    • With a heat-treated surface finish and optimized torsional strength, it withstands RPM levels up to 9,000+ and extreme stress, surpassing standard crankshafts in high-output scenarios*.

  • 4. Scenario Solutions

    • Designed specifically for BMW M5/M6 V10 engines, it ensures seamless integration and peak performance in racing and high-performance applications where power and precision are critical*.

  • 5. Certification Standards

    • Manufactured to automotive industry standards (e.g., SAE J

Product details

Billet 4340 Steel Crankshaft for BMW M5 M6 V10 S85 S85B50 Engine Cranks

The Billet 4340 Steel Crankshaft is engineered for BMW M5/M6 V10 S85/S85B50 engines, combining high-strength 4340 steel with precision-machined journals and counterweights. Designed for durability and balance, it reduces vibration and enhances performance in high-stress applications like racing or high-performance engines.

Technical specifications

FeatureSpecificationBenefit
MaterialBillet 4340 SteelHigh tensile strength, heat resistance
DesignPrecision-machined journals/counterweightsOptimal engine balance, reduced wear
Surface FinishHeat-treated, smooth finishLow friction, extended component lifespan
Oil HolesStrategically placed lubrication pointsEnsures consistent lubrication
CompatibilityBMW M5/M6 V10 S85/S85B50 enginesDirect OEM fitment

Customization guide

Adjustable counterweight placement and material thickness to meet specific engine specifications (e.g., RPM range, power output). Ideal for custom engine builds requiring tailored balancing or stroke ratios.

Get inspired

With its 4340 steel construction and optimized counterweight design, this crankshaft delivers unmatched reliability for high-performance engines. Whether upgrading a BMW M5 for track use or boosting power in a racing engine, this component ensures smooth operation under extreme conditions.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Torsional Strength120,000 psi+15% (138,000 psi)+30% (156,000 psi)*
Balance Precision±0.1mm±0.05mm±0.02mm
Material Hardness35 HRC40 HRC45 HRC

Supplier's note

  1. Technical Breakthroughs:

    • 4340 Steel Alloy: 20% stronger than traditional cast iron, enabling higher RPM tolerance.
    • Precision Counterweights: Reduces vibration by 30% compared to standard designs.
    • Integrated Oil Holes: Enhances lubrication efficiency by 25%, extending bearing life.

  2. Version Selection Guide:

    • Base Model: Suitable for daily-driven BMW M5/M6 vehicles with stock engine specs.
    • Advanced Model: Ideal for modified engines (e.g., 500+ HP) requiring enhanced durability.
    • Pro Model: Designed for racing or extreme high-performance builds, with triple the industry-standard torsional strength. For example, the Pro’s 45 HRC hardness paired with ±0.02mm balance precision ensures flawless operation at 9,000 RPM+, making it perfect for track-day enthusiasts.

Frequently asked questions

  • Which crankshaft model suits BMW M5/M6 V10 engines for high-performance applications?

  • How do I maintain the counterweights of a BMW crankshaft for longevity?

  • What’s the advantage of 4340 steel over cast iron for BMW engine crankshafts?

  • Can this crankshaft be customized for a BMW 5-Series E61 engine?

  • Is the 4340 steel crankshaft heat-treated for thermal stability in BMW engines?

  • What makes this crankshaft suitable for BMW M6 racing applications?

  • Does the BMW crankshaft include OEM-style journals for easy installation?

  • Why choose a billet crankshaft over a forged option for BMW V10 engines?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material CompositionHigh-performance enginesIndustry Standard: Cast Iron (Yield Strength: 500 MPa)
Our Base: 4340 Steel (800 MPa ▲)
Our Advanced: 4340 Steel + Heat Treatment (1,000 MPa ▲▲) (ASTM E8)		Enhanced durability for high RPMs and power output.
Lightweight for better power-to-weight ratio.		Higher cost than cast iron. Requires specialized machining.
Counterweight DesignRacing engines requiring smooth operationIndustry Standard: Basic counterweights (20% vibration reduction)
Our Base: Optimized counterweights (30% reduction ▲)
Our Advanced: Dynamic balancing (40% reduction ▲▲) (ISO 8041)		Reduces wear on bearings and pistons.
Minimizes engine instability.		Complex manufacturing increases production time.
Surface FinishHigh-revving enginesIndustry Standard: Standard machining (Friction Coefficient: 0.15)
Our Base: Polished finish (0.12 ▲)
Our Advanced: Nitrided surface (0.09 ▲▲) (SAE J423)		Longer lifespan under extreme stress.
Reduces micro-wear.		Requires additional post-processing steps.
CustomizationCustom engine buildsIndustry Standard: One-size-fits-all design
Our Base: BMW M5/M6 model-specific fit (▲)
Our Advanced: Full geometry customization (▲▲) (ISO 2768)		Perfect fit for niche applications like racing.
Reduces installation errors.		Longer lead times for custom orders.
Lubrication FeaturesEngines with high oil pressure demandsIndustry Standard: Basic oil holes (Flow Rate: 2 L/min)
Our Base: Optimized channels (2.5 L/min ▲)
Our Advanced: Multi-channel design (3 L/min ▲▲) (ASTM D5504)		Reduces bearing wear by 30%.
Prevents oil starvation at high RPMs.		Increased machining complexity.
Vibration ReductionLuxury and high-end vehiclesIndustry Standard: 20 dB reduction
Our Base: 25 dB ▲
Our Advanced: 30 dB ▲▲ (ISO 8041)		Smoother ride quality.
Extends transmission lifespan.		Higher material costs for advanced balancing.

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