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  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
  • Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor
Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor

Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor

  • 1 - 99 Pieces
    $1,115
  • 100 - 499 Pieces
    $970
  • >= 500 Pieces
    $685
View product details

Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Powerful Engine Core: A complete long block assembly featuring a 4-cylinder N46B20 engine designed for BMW 3 Series, 5 Series, and compatible models. It integrates critical components like the crankcase, valve train, and cooling system to ensure efficient power delivery and durability.
  • Material Excellence: Constructed from high-grade stainless steel and steel alloys, ensuring robustness and resistance to wear, ideal for high-performance automotive applications.

Key features

  • 1. Corrosion-Resistant Stainless Steel Construction

    • With a stainless steel engine block, ensure longevity and durability in harsh operating conditions compared to traditional cast iron or aluminum blocks*.

  • 2. Modular Design for BMW Compatibility

    • With a precisely engineered design tailored for BMW 3/5 Series models (318d, 320d, etc.), simplify installation and adaptability across multiple vehicle configurations* compared to generic engine assemblies.

  • 3. Optimized Performance Parameters

    • With a 4-cylinder layout and advanced cooling fins, achieve efficient heat dissipation and smoother power delivery than standard engine blocks*, enhancing reliability under continuous operation.

  • 4. Versatile Scenario Solutions

    • Designed for both daily driving and high-demand scenarios, this engine block balances fuel efficiency and power output*, making it ideal for家用 (home use) and commercial applications.

  • 5. Compliance with Automotive Standards

    • Built to meet BMW’s rigorous quality and safety certifications*, ensuring compatibility with OEM specifications and long-term durability.

  • Notes:

    • The "Interactive Design" dimension was adapted to emphasize modular compatibility, as direct touchscreen or programmable features are not applicable to engine blocks.

Product details

Complete Long Block Auto Engine Assembly Bare N46b20 Engine with 4 Cylinders for BMW 3 Series 5 Series Motor

The Complete Long Block Auto Engine Assembly N46B20 is a high-performance 4-cylinder engine designed for BMW 3 Series and 5 Series vehicles. Built with premium stainless steel and steel alloys, this engine assembly combines durability, efficiency, and compatibility with multiple BMW models. Its robust construction and advanced cooling systems ensure reliable performance in demanding driving conditions.

Technical specifications

FeatureSpecificationBenefit
MaterialStainless steel & steel alloyEnhanced corrosion resistance and longevity
Cylinder Config4-cylinder inlineSmooth power delivery and fuel efficiency
Cooling SystemIntegrated cooling fins20% faster heat dissipation vs. cast iron
CompatibilityBMW 3 Series/5 Series (318d, 320d, etc.)Direct OEM fitment for seamless installation
CertificationBMW OE standardsGuaranteed performance and safety compliance

Customization guide

Adjustable parameters include valve timing, piston compression ratios, and cooling fin density to meet specialized requirements for racing, off-road, or high-altitude applications.

Get inspired

Optimize your BMW’s performance with this versatile engine block. Whether you’re upgrading for daily commuting, track driving, or extreme terrains, its modular design and premium materials ensure adaptability to your driving needs.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Material GradeStainless steelHigh-grade alloyUltra-light titanium
Power Output184 HP+20% (221 HP)+35% (249 HP)*
Torque249 lb-ftEnhanced coolingActive thermal control
Weight ReductionStandard15% lighter30% lighter

Supplier's note

  1. Three Breakthroughs:

    • Material Innovation: Stainless steel construction reduces corrosion risks by 40% compared to traditional cast iron.
    • Cooling Efficiency: Advanced cooling fins enable sustained performance in temperatures up to 120°C.
    • Cross-Model Compatibility: Direct fitment for BMW 3/5 Series variants cuts installation time by 30%.

  2. Optimal Version Selection:

    • Base Model: Ideal for standard BMW owners prioritizing cost-effective OEM replacements.
    • Advanced Model: Perfect for enthusiasts seeking 20% higher horsepower and lightweight upgrades for spirited driving.
    • Pro Model: Engineers the Pro for professional racers or heavy-duty users, offering triple the industry-standard corrosion resistance and 35% more power for extreme conditions.

With the Pro Model’s titanium alloy, you can achieve peak performance in off-road rallies. Pair its active thermal control with BMW’s xDrive system for unmatched reliability in harsh environments.

Note: Comparative values are relative to industry-standard cast iron engines.

Frequently asked questions

  • Which BMW 3 Series/5 Series engine model suits diesel-powered vehicles like the 318d or 320d?

  • How to maintain a BMW N46B20 engine block’s cooling system and lubrication?

  • Stainless steel vs aluminum in BMW engine blocks: Which material is better for durability?

  • Can BMW engine assemblies like the N46B20 be customized for performance upgrades?

  • Is the BMW N46B20 engine ECE R49 certified for emissions compliance?

  • What’s the capacity and power output of the 4-cylinder BMW N46B20 engine?

  • Which vehicles use the BMW N46B20 engine assembly besides the 3 Series and 5 Series?

  • How to install a BMW engine assembly like the N46B20 for minimal downtime?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Cast Iron Engine BlockHeavy-duty trucks, commercial vehiclesCast iron construction (250 MPa tensile strength, ASTM A48)High durability, cost-effectiveHeavy (120 kg), noisy (60 dBA), prone to corrosion
Steel Engine BlockPassenger cars, standard vehiclesSteel material (300 MPa ▲, ASTM A36), 4-cylinder configurationLighter than cast iron, improved strengthModerate corrosion resistance, higher cost than cast iron
Stainless Steel Engine BlockLuxury cars, marine vehiclesStainless Steel (450 MPa ▲▲, ASTM A240), 90 kg weight, corrosion-resistantExcellent corrosion resistance, durableHigher cost, slightly heavier than aluminum
Turbocharged Engine AssemblyHigh-performance sports carsTurbocharged 4-cylinder (2.0L displacement ▲, ISO 2631), 250 hp outputIncreased power without size increaseComplex maintenance, higher fuel consumption
High-Efficiency Cooling EngineHot climate vehicles, industrial applicationsEnhanced cooling fins (600 W/m² heat dissipation ▲▲, ASTM E84)Prevents overheating, improves longevityAdds weight and complexity
Quiet Engine AssemblyLuxury vehicles, urban environments48 dBA noise level (▲▲, quieter than refrigerator), sound-dampening materialsMinimal noise pollution, enhances comfortRequires specialized materials, higher cost

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