WEBER K644-38 Carb Conversion Tbi D21 Z24I

( Brand: Weber ), ( Manufacturer Part Number: K644-38 ), ( Choke Type: Electric ), ( Type: Carburetor ), ( Features: Down Draft ), ( Vintage Part: No ), ( Performance Part: Yes )

Review WEBER Genuine Carb Conversion For Nissan D21 Tbi Pickup fits 1986–1989

Introducing the Weber K644-38 Carburetor Conversion Kit for the 1986-1989 Nissan D21 Z24i TBI, a high-performance upgrade for your vehicle's fuel system. This kit is a direct replacement for the factory TBI (Throttle Body Injection) system, offering a more responsive and engaging driving experience.

The Weber K644-38 carburetor is a dual-throat, 38mm downdraft design, providing excellent air/fuel mixture for efficient combustion. Each carburetor body is meticulously crafted from lightweight yet robust aluminum, featuring a polished finish that adds a touch of elegance to your engine bay.

1. Two Weber K644-38 carburetors

2. Intake manifold with integral throttle bodies

3. Fuel pressure regulator

4. Fuel pressure gauge

5. Fuel pump and mounting bracket

6. Air cleaner assembly

7. Coolant temperature sender

8. Idle mixture screws

9. Fuel lines and fittings

10. Throttle linkage

11. Vacuum lines

The kit also comes with detailed, easy-to-follow instructions to ensure a hassle-free installation process. Each carburetor is equipped with a vacuum secondary system, which provides an enrichened fuel mixture during deceleration and idle, ensuring optimal engine performance under all driving conditions.

By installing this Weber K644-38 Carburetor Conversion Kit, you'll not only enhance your vehicle's power and responsiveness but also gain the satisfaction of working on your own car with a high-quality, performance-oriented upgrade. This kit is a must-have for any D21 Z24i TBI owner looking to take their driving experience to the next level.

Weber K644-38 Carburetor Conversion for 1986-1989 Nissan D21 Z24i TBI: A Detailed Analysis

The Weber K644-38 carburetor conversion is an option for owners of 1986-1989 Nissan D21 Z24i TBI vehicles looking to improve engine performance. This analysis will discuss the potential advantages and disadvantages of implementing this upgrade.

1. Enhanced Throttle Response: Carburetors offer more precise throttle control compared to the stock fuel injection system, leading to improved engine response and acceleration.

2. Better Fuel Economy: A well-tuned carburetor can potentially provide better fuel economy by optimizing the air-fuel mixture for the engine.

3. Increased Power Output: The Weber K644-38 carburetor is known for its ability to deliver increased power, making it an attractive option for those seeking performance improvements.

4. Simplified Engine System: Carburetors can be easier to diagnose and repair compared to complex fuel injection systems, reducing potential repair costs.

1. Complex Installation: Installing a Weber K644-38 carburetor on a Nissan D21 Z24i TBI is a complex process that requires extensive mechanical knowledge and specialized tools.

2. Cost: The cost of purchasing, installing, and tuning a Weber K644-38 carburetor conversion can be quite high, potentially outweighing the potential performance benefits.

3. Fuel Economy Concerns: While some users report improved fuel economy, others have noted a decrease in fuel efficiency due to the carburetor's greater demands for air and fuel.

4. Maintenance: Carburetors require regular maintenance, including frequent jetting and tuning, to ensure optimal performance.

The decision to install a Weber K644-38 carburetor conversion on a 1986-1989 Nissan D21 Z24i TBI depends on the individual owner's priorities and resources. Those seeking improved throttle response, increased power, and the satisfaction of working on a complex engine project may find the investment worthwhile. However, for those who prioritize simplicity, ease of use, and cost-effectiveness, the potential challenges and expenses associated with this upgrade may outweigh the benefits.

If you are considering a carburetor conversion for your Nissan D21 Z24i TBI, carefully weigh the advantages and disadvantages and ensure you have the necessary mechanical knowledge, resources, and commitment to the project. Consider consulting with a professional mechanic or joining online communities of other D21 owners who have undergone similar conversions for additional insights and guidance.

Details:

Genuine Weber Carb conversion for 1986 1989 Nissan D21 Z24i TBI Pickup K644-38.

part #: k64438 prices

• $595.95-$649.30

specifications carbcoon:

• for makes: Nissan
• for years: 1986-1989
• brand: Weber
• mpn: K644-38
• choke type: Electric
• type: Carburetor
• features: Down Draft
• vintage part: No
• performance part: Yes

shipping carbcoon:

• carrier: USPS
• class: Standard
• cost: $0.00
• service: USPS Ground Advantage
• type: Calculated
• transit: 4-9 Days

payments carbcoon:

• credit card: Discover
• other
• wallet: Apple-pay

seller carbcoon:

• city: Marlton, New Jersey
• rating: 100.0%
• # reviews: 129

general carbcoon:

• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors
• condition: New

returns carbcoon:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

offer carbcoon:

• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0
• started: February 22, 2026

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