PORSCHE 9A110207704 Engine Motor Crankshaft M1.20 2.9L

( Manufacturer Part Number: 9A110207704 ), ( Part Type: Engine Motor Crankshaft ), ( Country Of Origin: Germany ), ( Manufacturer Warranty: 90 Days )

Review PORSCHE 2.9l Engine Motor Crankshaft Assembly Oem fits CAYMAN BOXSTER M1 2009–2012

The **Porsche 9A110207704 09-12 Cayman/Boxster M1.20 2.9L Flat-6 Engine Crankshaft** is a meticulously engineered component designed to deliver the uncompromising performance and reliability synonymous with Porsche s legendary roadsters. This crankshaft is a critical element of the **M1.20 2.9-liter flat-six engine**, which powers the 987.2 generation Cayman and Boxster models produced between 2005 and 2012. Crafted from high-grade forged steel, it features a robust **five-main-bearing journal design**, ensuring optimal stability, reduced vibration, and enhanced durability under the extreme stresses of high-revving performance driving. The crankshaft s **counterweights are precision-balanced** to minimize torsional forces, allowing the engine to maintain smooth operation even at high RPMs, a hallmark of Porsche s emphasis on both power and refinement. With a **70mm stroke and a compression ratio optimized for the 2.9L displacement**, this crankshaft plays a pivotal role in generating the engine s signature **300 to 320 horsepower** (depending on the specific model variant), delivering a torque curve that balances responsiveness with effortless mid-range pull. Whether installed in a naturally aspirated **Cayman S or Boxster S** or a supercharged **Cayman GT or Boxster GT**, this crankshaft ensures that every revolution contributes to the engine s signature blend of raw power and precision engineering. Its compatibility with the **9A110207704 engine code** a variant of the M1.20 series makes it an essential replacement part for restorers, tuners, and enthusiasts seeking to restore or enhance the performance of their 987.2 generation Porsche. Built to exacting Porsche specifications, this crankshaft exemplifies the brand s commitment to craftsmanship, ensuring that even after extensive use or in a rebuilt engine, it continues to deliver the performance and longevity expected from a true Porsche powerplant.

### **Pros and Cons of Buying a Porsche 9A110207704 (2009 2012 Cayman/Boxster, M1.20 2.9L Engine with Crankshaft Issue)**

#### **Overview**

The **Porsche 9A110207704** chassis (2009 2012 Cayman/Boxster) with the **M1.20 2.9L flat-six engine** is a desirable entry-level Porsche, known for its balance of performance, handling, and driving dynamics. However, the **crankshaft issue** (commonly referred to as the **"crankshaft bolt loosening" problem**) is a critical factor that must be carefully considered before purchasing.

---

### **Pros**

1. **Excellent Driving Dynamics**

- The M1.20 engine produces **320 325 hp** (depending on model) and **295 lb-ft of torque**, delivering strong acceleration and a linear powerband.

- The **9A1102 chassis** features Porsche s signature **rear-wheel-drive layout**, precise steering, and well-tuned suspension, making it highly engaging for both track and road use.

- The **boxer engine s low center of gravity** improves handling stability compared to V6 or V8 Porsches.

2. **Reliability (Compared to Earlier Models)**

- The **M1.20 engine** is more refined than the earlier **M97 (2.7L)** and **M96 (3.4L)** engines, with fewer known major failures.

- The **transmission (PDK or manual)** is robust, with fewer reports of premature failure than in some older Porsches.

3. **Aftermarket & Tuning Potential**

- The **2.9L engine** is well-supported by aftermarket parts, allowing for **power upgrades** (turbocharging, forced induction) and **performance modifications**.

- The **PDK (dual-clutch transmission)** can be tuned for better shift speeds and responsiveness.

4. **Lower Running Costs (Compared to V8 Models)**

- Fuel efficiency is **better than V8 Caymans/Boxsters** ( 18 22 MPG combined), reducing long-term operating costs.

- Maintenance costs are **lower than high-performance Porsches** (e.g., 911 Turbo, GT3), though still premium.

5. **Resale Value & Collectibility**

- The **2009 2012 models** are still sought-after, especially **Cayman S and Boxster S variants**, due to their performance and rarity.

- The **M1.20 engine** is considered a **transition engine** before Porsche moved to the **9A2 (2013 )**, making early models potentially more valuable in the long run.

6. **Comfort & Practicality**

- The **interior is well-built**, with **high-quality materials** (especially in higher trims like **S, Turbo, or Carrera Cabriolet**).

- The **cabriolet version** offers a **convertible experience** without the extreme wind noise of older models.

- **Storage space** is adequate for a sports car, though not as spacious as a 911.

7. **Track & Performance Capability**

- The **Cayman S and Boxster S** (with **340 hp**) are **track-ready out of the box**, making them great for enthusiasts.

- The **PDK transmission** provides **quick, precise shifts**, ideal for both street and track use.

---

### **Cons**

1. **Crankshaft Bolt Loosening Issue (Most Critical Flaw)**

- **Problem:** The **crankshaft bolts** (especially the **#1 and #4 bolts**) can **loosen or even break**, leading to **catastrophic engine failure** if undetected.

- **Rattling noise** from the engine bay (often described as a **"clattering" or "metallic tapping"**).

- **Check Engine Light (CEL)** with codes related to **crankshaft position sensor or misfires**.

- **Engine misfires, rough idle, or loss of power**.

- If a bolt **breaks**, it can **damage the crankshaft, connecting rods, or cylinder walls**, requiring a **complete engine rebuild or replacement** (costing **$10,000 $20,000 **).

- **Not all cases are severe** some bolts may just loosen but not break, allowing for a **bolt replacement and torque verification**.

- **Common in 2009 2012 models**, particularly **higher-revving engines (Boxster S, Cayman S)**.

- **Less common in naturally aspirated (NA) 2.9L models** compared to **turbocharged (TC) versions**.

- Porsche **replaced crankshaft bolts** in some cases under warranty, but **many owners were not aware of the issue** until damage occurred.

- **No official recall** owners must **inspect and replace bolts proactively**.

2. **High Maintenance & Repair Costs**

- Porsche **parts and labor are expensive**, with **specialized mechanics** required for proper service.

- **Suspension (coilovers, bushings, control arms)** Porsche s **adjustable suspension** wears out faster than stock.

- **Brakes (carbon-ceramic or steel)** **Carbon-ceramic pads/rotors** are **very expensive** ( $3,000 $5,000 for a full set).

- **Transmission (PDK fluid changes, clutch replacement)** PDK fluid **must be changed every 60,000 80,000 miles** to prevent failure.

- **Timing chain & tensioners** The **timing chain** can stretch over time, requiring replacement ( $2,000 $3,000).

3. **Depreciation & Market Saturation**

- The **2009 2012 Cayman/Boxster market is flooded** with used examples, leading to **lower resale values** compared to earlier or newer models.

- **High-mileage examples (over 80,000 miles)** may have **hidden issues** (suspension, transmission, engine wear).

4. **Noise & Vibration**

- The **boxer engine can be loud** (especially at high RPM), with **visible valve cover vibrations** in some models.

- **Road noise** is **noticeable** in the **cabriolet version**, though better than older convertibles.

- **PDK transmission** can be **noisy** in some cases, requiring **fluid changes and adjustments**.

5. **Limited Practicality**

- **Small interior** **Rear seats are extremely tight** (not suitable for adults).

- **Fuel range is short** ( 300 350 miles on a tank), requiring **frequent refueling** on long trips.

- **Not ideal for daily commuting** unless you **prioritize driving enjoyment over convenience**.

6. **Software & Electronics Quirks**

- **Porsche Communication Management (PCM) system** can be **glitchy**, with **infotainment freezes or touchscreen issues**.

- **Parking sensors** (if equipped) can be **unreliable** in some models.

- **Adaptive cruise control** may require **calibration after modifications**.

7. **Inspection & Hidden Costs**

- **Pre-purchase inspection (PPI) is essential** many issues (crankshaft bolts, timing chain, suspension) are **not visible** without a **full mechanical inspection**.

- **Modifications (tuning, exhaust, suspension)** can **void warranty** and **increase maintenance needs**.

---

### **Key Considerations Before Buying**

1. **Crankshaft Bolt Inspection is Mandatory**

- **Get a Porsche specialist to check the crankshaft bolts** they should be **torqued to spec (150 Nm) and inspected for cracks**.

- **If bolts are loose or damaged, expect to replace them ( $1,500 $3,000 for labor parts)**.

- **Avoid buying without proof of bolt replacement** this is the **#1 risk factor**.

2. **Service History Matters**

- **Regular oil changes (every 7,500 10,000 miles)**.

- **PDK fluid changes (every 60,000 80,000 miles)**.

- **Suspension service (coilovers, bushings, control arms)**.

- **Timing chain inspection (if over 80,000 miles)**.

- **Avoid cars with "unknown service history"** this is a **major red flag**.

3. **Choose the Right Model**

- **Cayman S / Boxster S (340 hp)**

Details:

These are normal for automotive parts and do not affect the functionality of item. 09-12 PORSCHE CAYMAN BOXSTER MA1.20 ENGINE MOTOR PISTON CONNECTING ROD 4 OEM. Keywords for search: 09-12 PORSCHE CAYMAN BOXSTER M1.20 2.9L ENGINE MOTOR CYLINDER VALVE COVER OEM. Contact: Questions.

Bentley Corvette Porsche Aston Martin Maserati Mercedes BMW Jaguar Land Rover. Shipping cost or carrier may change, based on final destination. All parts are tested either before or after removal from the vehicle. Safe Packing Global shipping.

WOW Automotive Alt Design OEM premium used parts Same day shipping Verified Fit No type: Part No: 9A110207704 condition: Used Good/Normal use see photos Quick fit summary: Porsche 911 Cabrera 4 Convertible 2-Door 2009 - 2012 ; Coupe GTS 2012 ; 4S 2011 - 2012 ;s GT3 2010 - 2012 ; RS 4.0 Tara Turbo Boxster Base Black Edition Spider Cayman Hatchback R GT2 2009 - 2011 ; 2011 ; Speedster 2 2009 Manufacturer Numbers, / 9A1 102 077 04 9A1.102.077.04, Shipping We typically ship parcels within 24 hours. Item may show light scuffs, scratches or other imperfections as a used part. Condition of Body Parts, panels and exterior parts may have minor cosmetic imperfections such as scratches, paint chips, scuffs, storage marks, or other signs handling transportation. 09-12 PORSCHE CAYMAN BOXSTER MA1.20 ENGINE MOTOR PISTON CONNECTING ROD 5 OEM.

part #: 9a110207704 prices

• $323.92-$2341.23

specifications cranshafengin:

• for models: M1, Cayman, Boxster
• for makes: Porsche
• for years: 2009-2012
• mpn: 9a110207704
• part type: Engine Motor Crankshaft
• country of origin: Germany
• manufacturer warranty: 90 Days

payments cranshafengin:

• credit card: Visa
• wallet: Paypal
• other

general cranshafengin:

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

seller cranshafengin:

• rating: 99.9%
• # reviews: 4779
• city: Dallas, Texas

offer cranshafengin:

• started: May 15, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True
• quantity: 1

returns cranshafengin:

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

shipping cranshafengin:

• cost: $50.00
• transit: 3-5 Days
• type: Fixed
• service: Standard
• class: Standard

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