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  3. LPC ZR-2100

LPC ZR-2100 Ls Forged Crank Rod Reluctor Wheel 4340 4.000 6.125

fits year: 2024.

Zr-2100 Lpc Ls 4340 Forged Crank 4.000 Inch Stroke 6.125 Rod 24 Tooth Reluctor Wheel

( Brand: Lpc ), ( Manufacturer Part Number: ZR-2100 ), ( Part Type: Crank Rod Wheel ), ( Stroke: 4.000 In ), ( Main Journal Diameter: 2.559 In ), ( Rod Journal Diameter: 2.100 In ), ( Snout Style: Standard ), ( Color: Natural ), ( Items Included: Reluctor Wheel ), ( Material Style: Billet ), ( Quantity: Each ), ( Material: Steel ), ( Alloy: 4340 ), ( Intended Balance: Internal ), ( Counterweight Location: Center ), ( Minimum Rod Length: 6.125 In ), ( 1 / 2 Piece Rear Main Seal: 1-piece ), ( Performance Part: Yes )

Review LPC Ls 4340 Forged Crank 4.000 Inch Stroke 6.125 Rod Tooth Reluctor Wheel fits 125 2024

The **LPC ZR-2100 LS 4340 Forged Crankshaft** is a high-performance, precision-engineered component designed to deliver unmatched durability, strength, and reliability for high-output LS-based engines, particularly those built for extreme power levels or heavy-duty applications. Crafted from **4340 alloy steel**, this crankshaft is forged to exacting standards, ensuring superior grain flow and structural integrity that resists fatigue, warping, and stress under the most demanding conditions. The **4.000-inch stroke** provides a substantial power boost by increasing displacement while maintaining a balanced, smooth operation, making it an ideal choice for enthusiasts pushing their engines beyond stock limits. The **6.125-inch rod journals** are generously sized to handle the increased stress from high horsepower applications, reducing the risk of rod bearing failure and ensuring long-term reliability. This crankshaft features **24 reluctor wheel teeth**, a critical component for accurate engine monitoring and tuning, particularly when paired with aftermarket ECUs or performance sensors. The **LS 4340 designation** signifies its compatibility with the LS engine family, offering precise fitment with stock or upgraded components while accommodating aftermarket rod bearings, seals, and harmonic balancers. Whether installed in a **supercharged, turbocharged, or naturally aspirated high-performance build**, this crankshaft is engineered to withstand the rigors of extreme power delivery, making it a cornerstone for serious builders seeking a balance of strength, precision, and performance. Its **forged construction** eliminates the risk of cracking or deformation under high RPMs or torque loads, while the **polished journals** ensure smooth operation with minimal friction, contributing to improved efficiency and longevity. For those seeking a crankshaft that can handle the most aggressive builds from drag racing to high-horsepower street machines this LPC ZR-2100 is a proven, high-performance solution that elevates engine reliability and power output to new heights.

### **Pros and Cons of buying a LPC ZR-2100 LS 4340 Forged Crank (4.000 Rod, 6.125 Stroke, 24 Reluctor Wheel)**

#### **Pros:**

1. **High-Quality Forged Crankshaft** The LS 4340 forged crank is significantly stronger than cast cranks, reducing the risk of catastrophic failure under extreme stress. This is particularly beneficial for high-performance applications, forced induction, or heavy-duty use.

2. **Durability and Longevity** Forged cranks are less prone to fatigue and cracking compared to cast counterparts, making them ideal for long-term reliability, especially in high-RPM or high-torque scenarios.

3. **Better Weight Distribution** Forged cranks are often more precisely machined, which can improve balance and reduce vibration, leading to smoother operation and potentially better longevity for connected components (e.g., rods, bearings).

4. **Compatibility with High-Performance Engines** The 4.000-inch rod length and 6.125-inch stroke are optimized for high-performance builds, offering better power output and torque characteristics compared to stock LS crankshafts.

5. **24-Reluctor Wheel** The 24-tooth reluctor wheel is more precise for engine monitoring systems (e.g., ECU tuning, boost control, or data logging) compared to the stock 58-tooth wheel, allowing for better crankshaft position (CKP) sensor resolution.

6. **Aftermarket Support** LPC (Lloyd Planetary Corporation) is a well-respected manufacturer in the performance engine market, with strong backing in tuning communities and compatibility with various performance parts.

7. **Potential for Increased Power** A forged crank can handle higher horsepower and torque levels without the risk of failure, making it a smart upgrade for forced induction (turbo/supercharged) or nitrous applications.

8. **Resale Value** A forged crankshaft is a premium component, and if the build is ever modified or sold, it retains higher value than a stock crank.

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#### **Cons:**

1. **Higher Upfront Cost** Forged cranks are significantly more expensive than stock or aftermarket cast cranks. This can be a major investment, especially for enthusiasts on a budget.

2. **Installation Complexity** Replacing a crankshaft requires disassembly of the entire engine, which can be labor-intensive and may require professional help, adding to the total cost.

3. **Potential Overkill for Stock or Mild Builds** If the engine is not heavily modified (e.g., stock or mild turbo), the benefits of a forged crank may not be fully realized, making the upgrade unnecessary.

4. **Weight Consideration** While forged cranks are durable, they are also heavier than cast cranks. In high-RPM applications (e.g., drag racing), excessive weight can slightly reduce performance unless balanced properly.

5. **Compatibility with Stock Components** Some stock LS engines may not have the necessary clearances or support for a forged crank, requiring additional modifications (e.g., upgraded rods, bearings, or main caps).

6. **Limited Availability of Parts** If something goes wrong (e.g., a bearing failure), finding replacement parts for a forged crank may be harder than for stock or more common aftermarket cranks.

7. **Learning Curve for Tuning** The 24-reluctor wheel may require recalibration of the ECU or tuning software, which could be a challenge for inexperienced builders.

8. **Risk of Misapplication** If the rest of the engine (e.g., rods, bearings, oil system) is not upgraded proportionally, the forged crank may not perform optimally or could be stressed unnecessarily.

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### **Ending Conclusion:**

The **LPC ZR-2100 LS 4340 forged crank (4.000 rod, 6.125 stroke, 24 reluctor wheel)** is one of the best upgrades available for serious LS engine builders targeting high performance, reliability, and longevity. It excels in applications where durability, power output, and precision are critical such as turbocharged, supercharged, or nitrous-enhanced engines. However, it is not a necessary upgrade for stock or mildly modified engines where a stock or aftermarket cast crank would suffice.

### **Recommendation:** - **Buy it if:**

- You are building a high-performance LS engine (e.g., 600 HP, forced induction, or drag racing).

- You prioritize reliability and want to avoid crankshaft failure under extreme stress.

- You plan to use the 24-reluctor wheel for precise tuning or data logging.

- You have the budget and are willing to invest in a long-term, high-quality component.

- **Skip it if:**

- Your build is stock or mildly modified (e.g., mild turbo, no nitrous).

- You are on a tight budget and can achieve similar performance with a high-quality cast crank.

- You lack the mechanical experience or resources to properly install and support the crank (e.g., upgraded rods, bearings, oil system).

For most **high-end LS builds**, this crank is a **strong recommendation** due to its proven durability and performance benefits. For **budget-conscious or stock builds**, it is likely **overkill** and not worth the additional cost. Always ensure the rest of the engine is properly supported to maximize the crank s potential.

Details:

LPC Forged 4340 Steel Crankshaft ZR-2100.

specifications pistonrinro:

  • for years: 2024
  • brand: Lpc
  • mpn: Zr-2100
  • part type: Crank Rod Wheel
  • stroke: 4.000 In
  • main journal diameter: 2.559 In
  • rod journal diameter: 2.100 In
  • snout style: Standard
  • color: Natural
  • items included: Reluctor Wheel
  • material style: Billet
  • quantity: Each
  • material: Steel
  • alloy: 4340
  • intended balance: Internal
  • counterweight location: Center
  • minimum rod length: 6.125 In
  • 1 / 2 piece rear main seal: 1-piece
  • performance part: Yes

payments pistonrinro:

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

seller pistonrinro:

  • # reviews: 92
  • rating: 100.0%
  • city: Sewell, New Jersey

offer pistonrinro:

  • started: March 13, 2026
  • sold: 0
  • options: Ship-to-home
  • quantity: 5
  • availability: In Stock

general pistonrinro:

  • condition: New
  • Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

shipping pistonrinro:

  • type: Calculated
  • cost: $0.00
  • transit: 7-11 Days
  • carrier: USPS
  • service: USPS Ground Advantage
  • class: Standard

returns pistonrinro:

  • paid by: Seller
  • policy: Returns Accepted
  • time: 30 Days
for years: 2024, part type: crank rod wheel, stroke: 4.000 in, main journal diameter: 2.559 in, rod journal diameter: 2.100 in, snout style: standard, items included: reluctor wheel, material style: billet, quantity: each, alloy: 4340, intended balance: internal, counterweight location: center, minimum rod length: 6.125 in, 1 / 2 piece rear main seal: 1-piece, performance part: yes,
category: auto parts > car truck parts accessories > engines engine parts > connecting rods parts, color: natural, material: steel, sku: 12762605348172663,
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