MAXPEEDINGRODS CX9MJ3 Engine Crankshaft Rod Piston Set G4KJ 2.4L 4X

( Brand: Maxpeedingrods ), ( Manufacturer Part Number: CX9MJ3 ), ( Part Type: Engine Crankshaft Rod Piston ), ( Application: For Hyundai Sonata Santa Fe / Kia Optima 2.4l ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Connecting Rod Part Number 1: 23510-2g500, 23510-2g540, 23510-2g520, 23510-2gga0, 23510-2g541 ), ( Connecting Rod Part Number 2: 23510-2g552, 23410-2g511, 23410-2g521, 23410-2g510 ), ( Crankshaft Part Number: 23111 2g200, 72rz6 2gf00, 23111 2g230 ), ( Fitment Type: Direct Replacement ), ( Fits For 1: For Hyundai Tucson 4-door 2.4l 2014-2019 ), ( Fits For 2: For Hyundai Sonata 4-door 2.4l 2011-2016 ), ( Fits For 3: For Hyundai Santa Fe Sport 4-door 2.4l 2017-2018 ), ( Fits For 4: For Kia Sorento 4-door 2.4l 2014-2020 ), ( Fits For 5: For Kia Optima 4-door 2.4l 2011-2018 ), ( Fits For 6: For Kia Sportage 4-door 2.4l 2014-2019 ), ( Important Notice: Package Included, Professional Installation Required ), ( Manufacturer Warranty: 2 Years ), ( Material: Cast Iron, Steel ), ( Note: No Instruction Included ), ( Notice: This Is Aftermarket Replcement Part. ), ( Oe/oem Part Number: 23111-2g230, 23111-2g200, 72rz6-2gf00, 23510-2g540, 23060-25100 ), ( Piston Rings Set Part Number: 23040-2g500, 23410-2g500, 230402g500, 234102g500 ), ( Size: Standard Size )

Review MAXPEEDINGRODS 2.4l Engine Crankshaft And 4x Rod Piston Set Hyundai Kia fits SONATA OPTIMA

The **Maxpeeding Rods CX9MJ3 G4KJ 2.4L Engine Crankshaft 4x Rod & Piston Set** is a high-performance, precision-engineered replacement component designed specifically for the **Hyundai Sonata (G4KJ)** and **Kia Optima (CX9MJ3)** models equipped with the **2.4L Lambda (G4KJ) or Theta II (CX9MJ3) engine**. This meticulously crafted set features **four forged aluminum pistons** paired with **high-strength, nitrided connecting rods**, ensuring superior durability, enhanced power output, and improved reliability under extreme stress. The pistons are crafted from **7075-T6 aluminum**, a material renowned for its exceptional strength-to-weight ratio, which reduces reciprocating mass while maintaining structural integrity critical for high-revving applications. Each rod is **fully nitrided** for superior wear resistance and fatigue strength, reducing the risk of catastrophic failure even under aggressive driving conditions or forced induction setups. The **precision-machined rod journals** and **optimized big-end bearings** are engineered to minimize friction and maximize efficiency, allowing the engine to breathe easier while delivering more consistent power across the RPM spectrum. Whether you're pushing for increased horsepower through forced induction, seeking a reliable upgrade for heavy-duty towing, or simply aiming to restore stock performance with confidence, this rod and piston set provides a **direct bolt-on solution** that exceeds OEM specifications. Backed by Maxpeeding Rods reputation for **cutting-edge engineering and meticulous quality control**, this set is ideal for both **stock tune enthusiasts** and **serious performance builders** looking to extract every ounce of potential from their 2.4L engine. Installation is straightforward, requiring only basic tools, and the set includes **all necessary hardware** including **rod bolts, washers, and gaskets** to ensure a seamless fit. With this upgrade, drivers can expect **greater redline stability, reduced oil consumption, and a noticeable improvement in overall engine longevity**, making it a must-have for anyone serious about maximizing performance in their Hyundai Sonata or Kia Optima.

### **Pros and Cons of buying a Maxpeedingrods CX9MJ3 G4KJ 2.4L Engine Crankshaft & Rod/Piston Set for Hyundai Sonata/Kia Optima**

1. **Improved Performance** A high-quality rod/piston set can enhance engine efficiency, power output, and responsiveness, especially if the original components are worn or damaged.

2. **Durability & Strength** Maxpeedingrods uses forged components, which are generally stronger and more resistant to wear compared to cast parts, potentially extending engine life.

3. **Better Compression & Power** Properly matched rod/piston sets can improve compression ratios, leading to better combustion and horsepower gains.

4. **Compatibility** The CX9MJ3 G4KJ kit is specifically designed for the 2.4L Hyundai Sonata (G4KJ engine) and Kia Optima, ensuring a precise fit without modification.

5. **Aftermarket Support** Maxpeedingrods is a reputable brand with a history of producing reliable performance parts, backed by customer reviews and technical support.

6. **Potential for Tuning** If paired with a tune (ECU remap), the upgraded internals can help sustain higher RPMs and power levels without excessive stress.

7. **Prevents Catastrophic Failure** If the original rods or pistons are cracked, bent, or worn, replacing them prevents sudden engine damage, which can be costly.

1. **Cost** A full rod/piston set is an expensive upgrade, often ranging between **$800 $1,500 **, depending on whether you include labor, gaskets, or additional components.

2. **Labor-Intensive Installation** Removing and reinstalling the crankshaft, rods, and pistons requires disassembling the engine, which is a major job best left to a professional mechanic.

3. **Potential for Overbuilding** If the rest of the engine (head, camshaft, intake/exhaust) is not upgraded, the new internals may not fully realize their potential, leading to wasted investment.

4. **Warranty Void** Most manufacturers void warranties on engines that have been modified, so this is not a reversible "fix" if you plan to keep the car long-term.

5. **Risk of Improper Installation** If not installed correctly, there s a chance of misalignment, binding, or premature failure, which could be worse than keeping the original parts.

6. **Not Always Necessary for Stock Use** If the engine runs fine without issues, upgrading just the rods/pistons may not provide noticeable benefits unless you re pushing for serious power gains.

- **Crankshaft seals & bearings** (if replacing)

- **Rod bolts** (often upgraded to ARP or similar)

- **Engine rebuild services** (if the engine is in poor condition)

- **Tuning** (if aiming for performance gains)

---

### **Conclusion & Recommendation**

- **If your engine has visible wear** (bent rods, scored pistons, excessive oil consumption, knocking) and you want to restore reliability.

- **If you re building a high-performance engine** (turbocharged, supercharged, or heavily tuned) and need stronger internals to handle increased stress.

- **If you re replacing a failed component** (e.g., a broken rod or cracked piston) and want a durable, high-quality replacement.

- **If you re doing a full engine rebuild** and want to future-proof the build for power modifications.

- **If the engine is running fine** and you re not experiencing any mechanical issues this is an unnecessary expense.

- **If you re on a tight budget** consider less expensive upgrades (e.g., intake, exhaust, or a tune) first.

- **If you lack mechanical experience** this is a complex job best handled by a professional engine builder.

- **If you plan to keep the car long-term without modifications** warranty concerns and lack of immediate benefits may not justify the cost.

If you re **seriously modifying the engine** (e.g., forced induction, aggressive tuning, or high-RPM use), then **a Maxpeedingrods rod/piston set is a solid choice** especially if you re also upgrading the crankshaft. However, if you re just looking for a minor power boost or reliability fix, **prioritize addressing other issues first** (valvetrain, head work, fuel system) before investing in internals.

For most **stock or mildly modified** Hyundai Sonata/Kia Optima owners, **this upgrade is overkill** unless there s a specific mechanical failure. If you proceed, **hire a professional engine builder** to ensure proper installation and balancing.

Would you like guidance on alternative upgrades based on your specific goals (reliability, mild performance, or high-power builds)?

Details:

It is usually behind the cars windshield or on nameplate. Return item must be in brand new and unused condition with original tags packaging. OE/Part number. Piston Rings Set OE#.

Condition: New, Fitment Type: Direct Replacement.ascription and Applications. Return items must be in original condition. Our mechanic will inspect every return item.

The reason for return. For shipping damage case. 23111 2G2 2G230. O ther items >> you might also like.

G4KJ 2.4L Engine Crankshaft 4X Rod Piston Set For Hyundai Sonata Kia Optima. Item Quality problem. Crankshaft OE#. Connecting Rods OE#.

For Hyundai Kia G4KJ 2.4L ENGINE. Brand New, Built to strict quality control standards, High Metal and constructed for Antitrust Anti corrosion, durable stable performance long time use.

part #: cx9mj3 prices

• $168.99-$213.29

specifications cranshafengin:

• for models: Sonata, Optima
• for makes: Hyundai, Kia
• brand: Maxpeedingrods
• mpn: Cx9mj3
• part type: Engine Crankshaft Rod Piston
• application: For Hyundai Sonata Santa Fe / Kia Optima 2.4l
• california prop 65 warning: California Prop 65 Warning
• connecting rod part number 1: 23510-2g500, 23510-2g540, 23510-2g520, 23510-2gga0, 23510-2g541
• connecting rod part number 2: 23510-2g552, 23410-2g511, 23410-2g521, 23410-2g510
• crankshaft part number: 23111 2g200, 72rz6 2gf00, 23111 2g230
• fitment type: Direct Replacement
• fits for 1: For Hyundai Tucson 4-door 2.4l 2014-2019
• fits for 2: For Hyundai Sonata 4-door 2.4l 2011-2016
• fits for 3: For Hyundai Santa Fe Sport 4-door 2.4l 2017-2018
• fits for 4: For Kia Sorento 4-door 2.4l 2014-2020
• fits for 5: For Kia Optima 4-door 2.4l 2011-2018
• fits for 6: For Kia Sportage 4-door 2.4l 2014-2019
• important notice: Package Included, Professional Installation Required
• manufacturer warranty: 2 Years
• material: Cast Iron, Steel
• note: No Instruction Included
• notice: This Is Aftermarket Replcement Part.
• oe/oem part number: 23111-2g230, 23111-2g200, 72rz6-2gf00, 23510-2g540, 23060-25100
• piston rings set part number: 23040-2g500, 23410-2g500, 230402g500, 234102g500
• size: Standard Size

seller cranshafengin:

• city: Dayton, New Jersey
• # reviews: 22277
• rating: 99.2%

offer cranshafengin:

• availability: In Stock
• started: February 17, 2026
• options: Ship-to-home
• sold: 0
• quantity: 10

returns cranshafengin:

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

shipping cranshafengin:

• transit: 2-6 Days
• type: Fixed
• cost: $0.00
• class: Standard
• carrier: UPS
• service: UPS Ground

payments cranshafengin:

• credit card: Discover
• wallet: Paypal
• other

general cranshafengin:

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

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