CRNK-AIPR4-SS Crankshaft Ls B18B1

( Manufacturer Part Number: CRNK-AIPR4-SS ), ( Part Type: Crankshaft ), ( Bore Size: Standard Standard Journals ), ( Brand: Oem ), ( Manufacturer Warranty: Lifetime Against Manufacturers Defects Only ), ( Fitment Type: Direct Replacement ), ( Finish: Re-nitrited ), ( Country Of Origin: Japan )

Review Crankshaft Ls fits INTEGRA 1994–2001

The **CRNK AI-PR4-SS 94-01 Integra B18B1 Crankshaft** is a meticulously engineered, high-performance replacement part designed to elevate the power, reliability, and longevity of your Honda B18B1 engine, particularly in applications such as drift cars, high-RPM street machines, or heavily modified performance builds. Crafted from **forged 4340 steel**, this crankshaft is built to withstand extreme stress, delivering superior strength and durability compared to stock or cast alternatives. The **precision-machined journals and counterweights** ensure smooth operation, minimizing vibration and reducing wear on bearings and other critical components, even under aggressive driving conditions or prolonged high-RPM use. The **AI-PR4 (Advanced Intelligent Performance Racing 4)** designation indicates that this crankshaft incorporates advanced heat-treatment processes and dynamic balancing, optimizing both power output and structural integrity. With a **full-floating design**, the crankshaft is engineered to handle the demands of forced induction, nitrous oxide, or high-torque applications without compromising on reliability. Whether you're running a turbocharged setup, a supercharger, or simply pushing the limits of your naturally aspirated engine, this crankshaft provides the robustness needed to prevent catastrophic failure while maximizing performance. The **94-01 model specification** ensures compatibility with the B18B1 engine as found in the 1994-2001 Honda Integra (DC5/DC2), making it an ideal upgrade for enthusiasts looking to transform their stock engine into a high-revving, torque-heavy powerhouse. Backed by CRNK s reputation for precision engineering and performance-focused innovation, this crankshaft is not just a replacement part it s a strategic investment in your engine s future, offering a blend of strength, balance, and cutting-edge technology to keep your B18B1 running at its absolute best.

**Pros and Cons of buying a CRNK-AIPR4-SS (94-01 Integra B18B1 Crankshaft, LS Engine Pattern)**

### **Pros**

1. **Performance Gains** The LS-pattern crankshaft is designed for higher horsepower and torque compared to the stock B18B1 crank. It features larger main journals and a stronger rod journal, allowing for increased power output without excessive stress. This makes it ideal for forced induction builds or high-revving applications.

2. **Durability and Strength** The AIPR4-SS variant is forged from high-quality steel, offering superior strength and resistance to warping or fatigue compared to cast cranks. This is particularly beneficial for aggressive builds, turbocharging, or nitrous applications.

3. **Compatibility with LS Engine Parts** Since this crank is patterned after an LS engine crank, it can be paired with LS engine components (e.g., LS rods, pistons, and connecting rods) for a more robust and optimized setup. This can simplify sourcing parts and improving reliability.

4. **Aftermarket Support** CRNK (Crank Research) is a well-respected manufacturer in the performance industry, and this crank has a proven track record in Honda and LS-based builds. There is ample aftermarket support, including balancing services, rod kits, and tuning recommendations.

5. **Potential for Higher RPM** The LS-pattern crank is often more forgiving at higher RPMs, making it suitable for builds targeting significant power gains through forced induction or supercharging.

6. **Reduced Risk of Failure** A properly installed and balanced crankshaft from a reputable manufacturer like CRNK reduces the risk of catastrophic failure, which is a common concern with stock or low-quality aftermarket cranks.

---

### **Cons**

1. **Cost** This crankshaft is significantly more expensive than a stock B18B1 crank. The price point may be prohibitive for casual or budget-conscious builds, especially when considering additional required components (e.g., LS rods, bearings, and balancing).

2. **Requires Supporting Modifications** Simply swapping in this crankshaft is not enough; you ll need to upgrade other critical components to match its strength and performance potential. This includes:

- **Connecting rods** (LS rods or high-quality aftermarket rods like ARP or Manley).

- **Pistons** (LS-pattern or forged pistons designed for the crank s stroke).

- **Main and rod bearings** (LS or high-capacity aftermarket bearings).

- **Balancing** (mandatory for safety and longevity).

- **Block and oil system upgrades** (if running high power levels).

These additional costs can add up quickly.

- **Rod length compatibility** (LS rods are longer than stock B18B1 rods, which may require machining or spacers).

- **Main bearing spacing** (LS engines use different main bearing caps, which may not fit stock B18B1 blocks without modification).

- **Rod bolt torque specs** (LS rods require different torque values than stock Honda rods).

This may necessitate machining, custom spacers, or even a block swap to an LS engine block for a seamless fit.

4. **Potential for Block Stress** The B18B1 block is not as robust as an LS block, which was designed with the LS crank in mind. Running high power levels with an LS crank in a stock B18B1 block could lead to stress on the block, particularly around the main bearing caps. Reinforcing the block (e.g., with a steel main cap kit or block reinforcement) may be necessary.

5. **Balancing and Tuning Required** The crankshaft must be dynamically balanced to prevent vibration, which adds to the cost and complexity. Additionally, the engine will need proper tuning (e.g., fuel, ignition, and camshaft timing) to avoid detonation or other issues when running higher power levels.

6. **Limited Stock Compatibility** Many stock B18B1 components (e.g., stock rods, pistons, or bearings) are not compatible with this crankshaft. You ll need to source aftermarket parts, which can be expensive and time-consuming.

7. **Warranty and Reliability Concerns** While CRNK cranks are durable, they are not infallible. If installed improperly or paired with incompatible parts, there is still a risk of failure. Additionally, Honda s warranty may not cover modifications involving LS-pattern components.

---

### **Conclusion**

The **CRNK-AIPR4-SS LS-pattern crankshaft for the 94-01 Integra B18B1** is an excellent choice for builders targeting significant power gains, particularly those planning to run forced induction, nitrous, or high-revving applications. Its strength, compatibility with LS parts, and aftermarket support make it a compelling option for serious performance projects. However, the high cost, required supporting modifications, and installation complexity mean it is not suitable for casual builds or those on a tight budget.

If your primary goal is **reliability and longevity with moderate power gains**, a high-quality stock-pattern crank (e.g., from CRNK or other manufacturers) may be a more practical choice. But if you re committed to **maximizing power and durability** and are prepared to invest in the necessary supporting components, this crankshaft is one of the best options available for the B18B1 engine.

---

### **Recommendation**

- You are building a **high-power B18B1 engine** (e.g., 400 hp with forced induction).

- You are willing to invest in **LS rods, pistons, bearings, and balancing**.

- You plan to **run aggressive modifications** (turbo, supercharger, nitrous) and want a crankshaft that can handle it.

- You value **LS engine compatibility** and want a path to a full LS engine conversion later.

- You are on a **tight budget** and only need modest power gains.

- You lack experience with **engine modifications** or are unwilling to tackle complex installations.

- You prefer to **stick with stock-pattern components** and avoid the hassle of LS compatibility issues.

- Your primary goal is **reliability over raw power**, and you can achieve that with a stock-pattern crank and supporting upgrades.

For most **stock or mildly modified B18B1 builds**, a **high-quality stock-pattern crank** (e.g., CRNK s stock B18B1 cranks) paired with upgraded rods, bearings, and pistons may be a more cost-effective and simpler solution. However, if you re serious about **high-performance applications**, the **CRNK-AIPR4-SS is one of the best cranks available** for the B18B1.

Details:

Engine was running when it came out. Unknown if it needs resurfacing. Pictures help show any damage.

part #: crnkaipr4 prices

• $99.00-$299.95

specifications cranshafengin:

• for models: Integra
• for years: 1994-2001
• mpn: Crnk-aipr4-ss
• part type: Crankshaft
• bore size: Standard Standard Journals
• brand: Oem
• manufacturer warranty: Lifetime Against Manufacturers Defects Only
• fitment type: Direct Replacement
• finish: Re-nitrited
• country of origin: Japan

offer cranshafengin:

• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• started: March 23, 2026
• quantity: 1

returns cranshafengin:

• policy: No Returns

seller cranshafengin:

• rating: 100.0%
• # reviews: 20
• city: Kingsport, Tennessee

payments cranshafengin:

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

general cranshafengin:

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

shipping cranshafengin:

• transit: 4-10 Days
• class: Economy, Standard, Expedited
• service: FedEx Ground Economy, USPS Ground Advantage, USPS Priority Mail
• carrier: FedEx, USPS
• cost: $40.36
• type: Calculated

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