78-81805 WSM Piston Sti Gtx Gsx Spx Xp

Review WSM Ltd/spx800/gtx/gsx/spx/xp Piston 5mm Os for STI GTX GSX SPX XP 1982–2004

The WSM 78-81805 piston is a high-performance aftermarket replacement for various Subaru models from the late 1990s to early 2000s, including the STI Limited, SPX800, GTX, and GP models. This piston is specifically designed for Subaru engines with an S800 82 series engine block, and it measures 5mm oversize.

This piston is manufactured using state-of-the-art techniques to ensure superior quality and durability. It features a forged construction made of high-strength aluminum alloy, ensuring optimal rigidity and resistance to engine pressures. The piston crown is designed with a dish shape to improve combustion efficiency and power output, while the skirt is optimized for a snug fit in the cylinder bore to minimize friction and reduce power loss.

The piston also includes a ring groove design with a compression ring, oil control ring, and two piston rings. The compression ring is designed to seal the combustion chamber effectively, while the oil control ring helps to prevent engine oil from entering the crankcase during high RPM operation. The piston rings are precision machined to ensure a proper seal between the piston and cylinder wall, reducing the risk of blow-by and ensuring optimal engine performance.

The piston also includes a piston pin and wrist pin boss, which are precision machined to ensure a secure fit and minimize the risk of failure under extreme engine conditions. The piston pin is made of high-strength steel, ensuring optimal durability and resistance to bending and breaking.

Overall, the WSM 78-81805 piston is an excellent choice for Subaru enthusiasts seeking to upgrade their engine performance and increase power output. Its high-quality construction, precise machining, and optimized design make it an ideal replacement for the original equipment piston in these Subaru models.

The WSM 78-81805 piston set, which includes variations such as STI Ltd/SPX800/GTX/GSX/SPX/XP with a part number 5mm, is a popular choice among Subaru WRX STI owners for upgrading their engines. Let's examine the potential advantages and disadvantages of investing in this piston set.

1. Enhanced Performance: These pistons are designed to provide improved power and torque, making your engine more responsive and increasing overall performance.

2. High-Quality Material: Made from forged material, these pistons offer superior strength and durability, reducing the risk of failure during high-performance driving.

3. Improved Engine Longevity: The increased strength and durability of these pistons can contribute to a longer engine life, especially for those who frequently push their engines to their limits.

4. Reduced Engine Noise: Upgrading to these pistons can result in a quieter engine, as they are designed to reduce mechanical noise and vibration.

1. Cost: The price point for these pistons is relatively high compared to stock pistons, making it a significant investment for some Subaru WRX STI owners.

2. Complex Installation: Installing these pistons requires a considerable amount of expertise and specialized tools, making it a time-consuming and potentially expensive process.

3. Potential Compatibility Issues: Ensure that you select the correct piston set for your specific engine configuration to avoid potential compatibility issues that could lead to engine damage.

The WSM 78-81805 piston set offers numerous benefits, including enhanced performance, improved engine longevity, reduced engine noise, and the use of high-quality materials. However, the considerable cost, complex installation process, and potential compatibility issues may deter some Subaru WRX STI owners. Ultimately, if you are an enthusiast seeking maximum engine performance and durability, investing in this piston set could be a worthwhile investment. If you are budget-conscious or less experienced in engine upgrades, it may be wise to consider alternative options or seek professional advice before making a decision.

Details:

Sea-door 2004 - GTI ltd 800 2003 1999 Spx 1998 Gsx Gtx 1997 Xp 1996 1995.

specifications watercraftimp:

• for models: Sti, Gtx, Gsx, Spx, Xp
• for years: 1982–2004
• brand: Wsm
• mpn: 78-81805
• part type: Piston

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components

seller watercraftimp:

• # reviews: 416
• rating: 100.0%
• city: enumclaw, washington

shipping watercraftimp:

• transit: 3-9 days
• carrier: ups
• class: standard
• type: calculated
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returns watercraftimp:

• time: 30 days
• paid by: buyer
• policy: returns accepted

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• other
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offer watercraftimp:

• prices: $74.27–$91.47
• item condition:
  • New
  • New other (see details)
• availability: in stock
• sold #: 20
• options: ship-to-home
• started: may 12, 2025
• in stock #: 5