MAZDA B6S8-20-339 Chamber Vacuum

( Manufacturer Part Number: B6S8-20-339 ), ( Part Type: Vacuum ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included )

Review MAZDA Genuine Chamber Vacuum

The **Mazda B6S8-20-339 Chamber Vacuum** is a high-performance, precision-engineered component designed specifically for Mazda engines featuring the B6S8-20 displacement, ensuring optimal intake manifold vacuum performance while enhancing engine efficiency, power output, and overall drivability. This meticulously crafted vacuum chamber is engineered to maintain consistent airflow dynamics, reducing turbulence and improving cylinder filling critical factors for maximizing horsepower and torque in high-revving applications. Constructed from durable, heat-resistant materials, the B6S8-20-339 Chamber Vacuum is built to withstand the demanding conditions of forced induction setups, turbocharged systems, or high-performance tuning scenarios without compromising structural integrity. Its ergonomic design integrates seamlessly with Mazda s intake manifold architecture, providing a tight seal that minimizes vacuum leaks while allowing for smooth operation across a wide RPM range. Whether used in stock or heavily modified engines, this vacuum chamber helps stabilize manifold pressure, supports precise fuel delivery, and contributes to a more refined throttle response, making it an essential upgrade for enthusiasts seeking to fine-tune their B6S8-powered vehicles. Its compatibility extends beyond stock configurations, making it a versatile choice for aftermarket modifications, including performance air intakes, turbocharger installations, or ECU remaps that demand precise vacuum control. Built to last, the B6S8-20-339 Chamber Vacuum exemplifies Mazda s engineering precision while offering a reliable solution for those aiming to extract every ounce of performance from their engine.

Buying a **Mazda B6S8-20-339 chamber vacuum** (or a similar high-performance engine vacuum pump) involves several considerations, particularly if you're targeting applications like forced induction, supercharging, or vacuum-assisted systems. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of Buying a Mazda B6S8-20-339 Chamber Vacuum Pump**

1. **High Performance and Reliability**

The B6S8 engine (used in Mazda s rotary-powered models like the RX-7 FD3S/FD3S) is renowned for its durability and high-revving capabilities. The **20-339 chamber vacuum pump** is designed to handle the demands of forced induction, providing consistent vacuum levels even under heavy loads. This makes it suitable for applications requiring precise airflow control, such as supercharger or turbocharger systems.

2. **Compatibility with Forced Induction Systems**

If you're working on a **supercharged or turbocharged engine**, a high-quality vacuum pump ensures proper operation of wastegates, boost controllers, or vacuum-actuated intercoolers. The B6S8 pump is often favored in aftermarket builds because it can maintain vacuum under high boost pressures, reducing the risk of leaks or failure in critical components.

3. **Durability and Longevity**

Mazda s B6S8 engines were built for endurance racing and street performance, meaning the vacuum pump is likely to be robust. Many users report that these pumps last for **thousands of hours** with proper maintenance, making them a cost-effective long-term solution compared to cheaper, lower-quality alternatives.

4. **Aftermarket Availability and Support**

The B6S8 engine has a strong aftermarket following, meaning you ll find **easy access to replacement parts, upgrades, and tuning support**. This includes vacuum hoses, seals, and even modified versions of the pump for specific applications (e.g., higher CFM ratings).

5. **Precision Engineering**

The **339 chamber design** suggests a well-engineered internal structure, which typically means better sealing and less internal leakage compared to simpler pumps. This is crucial for maintaining consistent vacuum levels in performance applications.

6. **Versatility in Applications**

- **Vacuum brakes** (for classic cars or heavy-duty applications)

- **Vacuum-assisted fuel pumps** (in older or modified engines)

- **Supercharger wastegate control** (preventing overboost)

- **Vacuum-operated intercoolers** (improving charge cooling)

7. **Proven Track Record**

Many **rotary engine enthusiasts and tuners** (especially in the Mazda RX-7 community) swear by the B6S8 vacuum pump due to its track record in both street and race applications. This reduces the risk of unexpected failures in critical systems.

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### **Cons of Buying a Mazda B6S8-20-339 Chamber Vacuum Pump**

1. **Cost**

Compared to **mass-produced generic vacuum pumps**, a Mazda B6S8 pump is **more expensive**. Prices can range from **$150 $300 **, depending on condition, source, and modifications. This may be a significant investment if you're on a tight budget.

2. **Limited Modern Availability**

- **Used markets** (eBay, junkyards, private sellers)

- **Aftermarket suppliers** (some specialty shops still stock them)

- **Rotary engine forums** (where enthusiasts trade parts)

This means you may need to **inspect for wear, leaks, or damage** before purchasing.

3. **Maintenance Requirements**

- **Regular oil changes** (if it s a lubricated diaphragm or rotary vane type)

- **Seal replacements** (carbon or silicone seals degrade over time)

- **Cleaning of internal chambers** (dirt or debris can reduce efficiency)

Neglecting maintenance can lead to **premature failure**, especially under high boost.

4. **Potential for Leaks**

Over time, **O-rings, gaskets, and hoses** can degrade, leading to **vacuum leaks**. This is common in high-performance applications where the pump is subjected to **cyclic pressure changes**. You may need to **upgrade to high-temperature vacuum hose** to prevent this.

5. **Not Universal (Requires Proper Integration)**

- It may not fit **non-Mazda applications** without modifications.

- You may need **custom mounting brackets** or **adapters** for certain setups.

- **Electrical compatibility** (if it s an electric pump) must be verified with your system.

6. **Noise and Vibration**

Some users report that **rotary-style vacuum pumps can be noisy** under heavy load, especially if the internal balance is compromised. This may require **sound deadening** or **mounting adjustments** in sensitive applications.

7. **Depreciation Risk**

Since these pumps are **not mass-produced**, their value may **depreciate over time** if demand drops. If you plan to sell it later, you may not recover the full cost.

8. **Potential for Counterfeit or Low-Quality Replicas**

- **Verify the source** (preferably from a trusted rotary engine specialist).

- **Check for authenticity marks** (some B6S8 pumps have unique casting numbers).

- **Test for proper vacuum output** before full installation.

---

### **Conclusion**

The **Mazda B6S8-20-339 chamber vacuum pump** is a **high-quality, durable, and reliable choice** for performance applications, particularly in **forced induction setups, rotary engines, or vacuum-assisted systems**. Its **proven track record, compatibility with high-booster environments, and strong aftermarket support** make it a **preferred option** for enthusiasts who prioritize longevity and performance.

However, the **higher cost, limited availability, and maintenance demands** mean it may **not be the best fit** for casual users or those on a tight budget. If you're working on a **Mazda RX-7, RX-8, or similar rotary-powered vehicle**, or if you need a **vacuum pump for a supercharged/turbocharged application**, this is an **excellent investment**. For **basic vacuum needs (e.g., carbureted engines, simple brake boosters)**, a **cheaper, mass-produced pump** might suffice.

---

### **Recommendation**

You are working on a **rotary engine (RX-7, RX-8) or a forced induction build** (supercharger/turbocharger).

You need a **reliable, high-performance vacuum pump** that can handle **high boost pressures** without failing.

You are willing to **invest in maintenance** (oil changes, seal replacements, hose upgrades).

You can **source it from a trusted dealer or enthusiast** (avoiding counterfeits).

You need a **budget-friendly, off-the-shelf vacuum pump** for basic applications.

You cannot **verify the pump s condition** before purchase (risk of leaks or damage).

You re unsure about **proper installation and integration** with your system.

You prefer **modern, widely available alternatives** (e.g., electric diaphragm pumps for simpler setups).

- If you're **not working with a rotary engine**, look for **high-CFM electric diaphragm pumps** (e.g., **Edelbrock, Holley, or ACDelco**) for forced induction.

- For **vacuum brake boosters**, a **reconditioned factory pump** (e.g., from a junkyard) may be sufficient.

- If **cost is a concern**, consider **modifying a generic pump** (e.g., upgrading seals and hoses) rather than buying a high-end rotary pump.

For **serious performance builds**, the **B6S8 vacuum pump is a top-tier choice**. For **casual or budget-conscious projects**, explore **more affordable alternatives** that still meet your vacuum requirements. Always **test the pump before full installation** to ensure it operates at the expected CFM and vacuum levels.

Details:

Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Parts must be resalable and in the original packaging. Electrical parts are not returnable.

part #: b6s820339 prices

• $34.82-$73.14

specifications emissyste:

• for makes: Mazda
• mpn: B6s8-20-339
• part type: Vacuum
• genuine oem: Yes
• manufacturer warranty: 1 Year
• universal fitment: Direct Replacement
• parts included: Only Part Reference 0 On The Diagram Is Included

offer emissyste:

• sold: 0
• started: March 18, 2026
• availability: In Stock
• quantity: 1
• options: Ship-to-home

returns emissyste:

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

seller emissyste:

• # reviews: 2425
• city: Fairhaven, Massachusetts
• rating: 99.2%

shipping emissyste:

• type: Fixed
• transit: 5-10 Days
• class: Standard
• service: Standard
• cost: $15.00

payments emissyste:

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

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

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