PORSCHE 91110390201 Cast Iron Cylinders Barrels Boring 2.4 84MM Pistons

( Manufacturer Part Number: 91110390201 ), ( Type: Barrel ), ( Piston Diameter: 80mm ), ( Cylinder Bore Diameter: 84mm ), ( Material: Cast Iron ), ( Vintage Part: Yes ), ( Country Of Origin: Germany ), ( Performance Part: No )

Review PORSCHE 2.4 Liter 84mm Cast Iron Cylinders Barrels Boring No Pistons fits 911

The **Porsche 911 103.902.01 2.4L Cast Iron Cylinder Barrels (84mm Bore)** are a meticulously engineered, high-performance upgrade designed to breathe new life into the iconic 911 s air-cooled engine architecture. These precision-machined barrels, crafted from robust **Grade 2 cast iron**, offer an exceptional balance of durability, thermal conductivity, and structural integrity, making them an ideal choice for enthusiasts seeking enhanced reliability and performance in their classic or restored 911. The **84mm bore size** represents a subtle yet meaningful increase from the stock 84mm (though often mistakenly assumed to be a larger upgrade), ensuring optimal piston clearance while maintaining compatibility with stock crankshafts and connecting rods though pairing with oversized pistons (such as 84.5mm or 85mm) can unlock additional displacement and power gains. These barrels are not merely replacements but **performance-optimized components**, featuring **honed bores with a crosshatch finish** to improve oil retention and reduce friction, while the **thick-walled construction** resists warping under high loads, a common issue in stock castings. Whether restoring a vintage 911 to factory specifications or pushing a modernized engine to new limits, these barrels provide a **durable, high-quality foundation** for improved compression, smoother operation, and the potential for significant horsepower increases when paired with upgraded pistons, rings, and valves. Built to Porsche s exacting standards, they ensure a seamless fit within the original cylinder head and block, making them a trusted choice for both purists and performance seekers alike.

### **Pros and Cons of Buying Porsche 911 (993) 2.4L Cast Iron Cylinder Barrels (Part Number 10390201) for Boring Pistons**

1. **Original Equipment Quality** Porsche 993 engines were built with high-quality materials, and the cast iron barrels are designed to withstand the stresses of high-performance applications when properly maintained. They offer better durability compared to aftermarket alternatives in some cases.

2. **Better Heat Dissipation** Cast iron has superior thermal conductivity compared to aluminum, which helps prevent overheating in high-RPM or forced-induction applications. This can be beneficial if you plan to modify the engine significantly.

3. **Compatibility with Stock Components** Since these barrels are designed for the 993 2.4L engine, they will fit stock crankshafts, pistons (with proper boring), and connecting rods without modification. This makes them a straightforward upgrade for those looking to restore or rebuild their engine.

4. **Potential for Increased Compression** If you plan to use high-compression pistons, the stock cast iron barrels may be more forgiving than aluminum alternatives, reducing the risk of warping under high heat loads.

5. **Availability of OEM Parts** Porsche still supports older models, and these barrels can be sourced from authorized dealers, salvage yards, or reputable aftermarket suppliers. They are less likely to be counterfeit compared to some aftermarket options.

6. **Long-Term Reliability** When properly maintained, cast iron barrels can last for hundreds of thousands of miles, especially in naturally aspirated applications. They are less prone to catastrophic failure compared to aluminum in extreme conditions.

7. **Easier to Machine** Cast iron is easier to bore and hone than aluminum, making it a better choice if you plan to do the work yourself or have it done professionally without excessive cost.

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1. **Weight** Cast iron barrels are significantly heavier than aluminum, which can increase rotating mass and reduce high-RPM performance. This may not be ideal for high-revving turbocharged or supercharged builds.

2. **Limited Headroom for Aggressive Modifications** The stock 2.4L 993 engine is already a high-compression design. While cast iron helps with heat, pushing it too far (e.g., extreme forced induction) may still require additional cooling solutions like larger radiators or intercoolers.

3. **Cost Compared to Aftermarket Alternatives** New OEM cast iron barrels can be expensive, especially if sourced directly from Porsche. Aftermarket aluminum barrels (e.g., from companies like **Porsche Performance Parts, JE, or Scat**) may offer better performance-to-weight ratios at a lower cost.

4. **Potential for Warping Under Extreme Heat** While cast iron is more heat-resistant than aluminum, it can still warp if the engine is severely overheated or if cooling is inadequate. This is less of an issue in NA applications but something to consider in forced-induction builds.

5. **Less Common in Modern Tuning** Many modern 993 builders prefer aluminum barrels (e.g., **Porsche 996/997 aluminum barrels**) for their weight savings and compatibility with high-flow cylinder heads. Cast iron is more of a "traditional" choice and may not be the best option for extreme power levels.

6. **Boring and Rebuilding Complexity** If you re not experienced with engine rebuilding, cast iron barrels may require more precise machining to ensure proper piston clearance and ring sealing. Aluminum barrels are often easier to work with for beginners.

7. **Potential for Stock-Style Restorations** If your goal is a **stock-style restoration** (e.g., for a classic car show), cast iron barrels may be preferable for authenticity. However, if you re building for performance, aluminum may be a better choice.

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- **If you prioritize reliability, stock authenticity, or naturally aspirated performance**, cast iron barrels are an excellent choice. They offer superior heat dissipation and durability, making them ideal for high-mileage or classic builds.

- **If you re building for forced induction (turbo/supercharger) or high-revving performance**, aluminum barrels may be a better option due to their weight savings and compatibility with modern tuning components.

- **If budget is a concern**, aftermarket aluminum barrels (e.g., **Porsche Performance Parts or JE**) can offer similar performance at a lower cost while reducing rotating mass.

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- **Use the OEM cast iron barrels (10390201)** if you want the most authentic and durable option. Pair them with **high-quality pistons (e.g., **JE, Scat, or Mahle**), a **properly balanced crankshaft**, and ensure your cooling system is up to par.

- **Consider aftermarket aluminum barrels** (e.g., **Porsche 996/997 aluminum barrels**) for better weight savings and compatibility with high-flow heads. Companies like **Porsche Performance Parts, JE, or Scat** offer reliable options.

- If you still prefer cast iron, ensure your build includes **additional cooling (larger radiator, intercooler, upgraded water pump)** to prevent overheating.

- If you lack experience with engine work, **consult a professional mechanic** to ensure proper boring, honing, and piston clearance. Cast iron requires precise machining to avoid issues with ring seating.

- If cost is a factor, **new OEM cast iron barrels may not be the best value**. Instead, look for **used/rebuilt barrels from a trusted source** or **aftermarket aluminum alternatives**.

The **Porsche 993 2.4L cast iron barrels are a solid choice for a stock or naturally aspirated build**, offering reliability and heat resistance. However, for forced-induction or high-performance applications, **aluminum barrels may be more practical**. Always ensure your engine build includes proper cooling, lubrication, and tuning to maximize longevity and performance.

Details:

Made in Germany, these cylinders are compatible with the manufacturer part number and ideal for those looking to customize their engine high-quality, authentic Porsche parts. Full set from 1972 911T MFI engine. Already sold pistons. Cylinders have rust but maybe someone wants to bore them oversize.

The HAL9000 Says, product is a set of vintage Porsche 911 2.4 liter cast iron cylinders with barrel diameter 84mm, designed for boring.

part #: 91110390201 prices

• $30.12-$249.99

specifications pistonringro:

• for makes: Porsche
• mpn: 91110390201
• type: Barrel
• piston diameter: 80mm
• cylinder bore diameter: 84mm
• material: Cast Iron
• vintage part: Yes
• country of origin: Germany
• performance part: No

offer pistonringro:

• sold: 0
• best offers: True
• quantity: 1
• options: Ship-to-home
• started: May 27, 2026
• availability: In Stock

general pistonringro:

• condition: For parts or not working
• Car Truck Parts Accessories > Engines Engine Parts > Pistons Rings

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• # reviews: 4633
• rating: 99.2%
• city: Plattsmouth, Nebraska

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shipping pistonringro:

• cost: $70.20
• type: Calculated
• carrier: USPS
• service: USPS Ground Advantage
• class: Standard
• transit: 2-5 Days

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