FARRIS ENGINEERING 27DA23-M40-S4 Curtiss Wright 27DA23-M40/S4

( Brand: Farris Engineering ), ( Manufacturer Part Number: 27DA23-M40/S4 )

Review FARRIS ENGINEERING 27da23-m40/s4 Curtiss Wright Used

The **Farris Engineering 27DA23-M40/S4 Curtiss-Wright 27DA23M40S4** is a high-performance, industrial-grade electric actuator designed for precision control in demanding applications, particularly within the aerospace, defense, and industrial automation sectors. This robust actuator is engineered by Farris Engineering, a trusted name in motion control solutions, leveraging Curtiss-Wright s renowned expertise in aerospace and defense technologies to deliver a compact yet powerful component capable of handling critical functions with unmatched reliability. The **27DA23M40S4** is part of the **27DA series**, a family of brushless DC (BLDC) electric actuators known for their efficiency, durability, and seamless integration into complex systems. This specific model is optimized for applications requiring high torque output, precise positioning, and long-term operational stability, making it ideal for use in flight control surfaces, landing gear systems, missile guidance mechanisms, and other high-stakes environments where failure is not an option.

At its core, the **27DA23-M40/S4** features a **permanent magnet synchronous motor (PMSM)** paired with a **high-efficiency gear reduction system**, delivering a torque output of **40 Nm (Newton-meters)** while maintaining a compact form factor. The **M40** designation indicates its torque rating, ensuring it can handle substantial loads with minimal backlash, which is critical in applications where positional accuracy and repeatability are non-negotiable. The **S4** variant further enhances its suitability for demanding conditions by incorporating a **sealed, IP65-rated enclosure**, providing protection against dust, moisture, and contaminants essential for outdoor or harsh indoor environments. This rugged construction ensures the actuator can withstand extreme temperatures, vibration, and shock, making it a dependable choice for aerospace platforms exposed to rigorous operational stresses.

One of the standout features of this actuator is its **digital control interface**, which supports **CAN (Controller Area Network) or RS-485 communication protocols**, enabling seamless integration with modern automation systems, flight control computers, or industrial PLCs. This connectivity allows for real-time monitoring, diagnostics, and precise feedback control, enhancing system performance and reducing downtime. Additionally, the actuator is designed with **fail-safe mechanisms**, including built-in current and temperature sensors, which can trigger protective measures in the event of overload or overheating, thereby preventing catastrophic failures. The **brushless design** eliminates the need for maintenance associated with commutators and brushes, contributing to its long operational lifespan and reduced total cost of ownership.

The **27DA23-M40/S4** is also engineered for **high-speed responsiveness**, with a dynamic range that allows for rapid acceleration and deceleration without compromising stability. This makes it particularly well-suited for applications requiring dynamic positioning, such as in missile stabilization systems or adaptive flight control surfaces. Furthermore, its **low inertia design** minimizes energy consumption while maximizing efficiency, which is a critical consideration in aerospace applications where weight and power draw are tightly constrained. The actuator s **modular design** also allows for easy customization, including the addition of custom mounts, feedback sensors, or auxiliary power interfaces, ensuring it can be tailored to specific application requirements without sacrificing performance.

In summary, the **Farris Engineering 27DA23-M40/S4 Curtiss-Wright 27DA23M40S4** is a high-performance, industrial-grade electric actuator that combines aerospace-grade reliability with advanced motion control capabilities. Whether deployed in flight control systems, defense mechanisms, or industrial automation, this actuator delivers **uncompromising torque, precision, and durability**, making it a cornerstone component for engineers and designers seeking dependable, high-performance solutions in the most demanding environments. Its seamless integration with modern control systems, robust construction, and fail-safe features ensure it remains a trusted choice for applications where performance and reliability are paramount.

### **Pros and Cons of buying a Farris Engineering 27DA23-M40/S4 (Curtiss-Wright 27DA23M40S4) Engine**

#### **Overview**

The **Farris Engineering 27DA23-M40/S4** (based on the **Curtiss-Wright 27DA23M40S4**) is a high-performance, fuel-injected, air-cooled, horizontally opposed (flat) engine commonly used in experimental and production aircraft. It is a modified version of the original **Curtiss-Wright 27DA-23**, offering improved reliability, power, and efficiency. This engine is favored in light aircraft, homebuilt projects, and performance-oriented general aviation applications.

---

### **Pros**

1. **Proven Reliability and Durability**

- The **27DA series** has a long history of use in aviation, with thousands of flight hours logged. Farris Engineering s modifications (such as improved fuel injection, better cooling, and upgraded components) enhance its robustness.

- Many operators report **low maintenance requirements** compared to older carbureted engines, reducing long-term costs.

2. **High Power-to-Weight Ratio**

- The **M40/S4 variant** delivers ** 180 200 HP** (depending on modifications and tuning), making it one of the most powerful air-cooled engines in its class.

- Its **lightweight design** (typically ** 300 350 lbs dry**) improves aircraft performance without excessive weight penalties.

3. **Fuel Injection System**

- **Better fuel efficiency** (reduced fuel waste, improved throttle response).

- **Consistent power delivery** across altitudes and temperatures.

- **Easier cold starts** and reduced risk of **carb icing**.

- The **S4 designation** often includes **sequential fuel injection**, which further improves performance and reliability.

4. **Modular and Upgradeable Design**

- **Upgraded cylinder heads** (higher compression ratios).

- **Turbocharging options** (for significant power increases).

- **Direct-drive or gear-driven propeller options** (flexibility in aircraft integration).

- Many owners **swap in newer components** (e.g., modern ignition systems, upgraded oil pumps) to extend engine life.

5. **Strong Aftermarket and Support Network**

- **Farris Engineering** provides **comprehensive manuals, support, and parts** for their modified engines.

- **Curtiss-Wright s legacy** means **easier access to original parts** if needed.

- **Active owner communities** (forums, groups) share troubleshooting tips and modifications.

6. **Good Fuel Economy for Its Power Class**

- Compared to turbocharged or piston engines of similar power, the **27DA-23M40/S4** offers **decent fuel efficiency** ( 6 8 GPH at cruise), making it cost-effective for general aviation.

7. **Versatile Applications**

- **Experimental aircraft** (e.g., RV series, homebuilts).

- **Production aircraft** (e.g., some variants of the **Van s RV-6, RV-8**).

- **Ultralights and STOL aircraft** (due to its power-to-weight ratio).

- Can be **gear-driven** for **constant-speed propellers**, improving efficiency.

8. **Lower Operating Costs (Compared to Some Alternatives)**

- **Oil changes** are less frequent than in some turbocharged engines.

- **Less prone to detonation** than higher-compression engines when properly tuned.

- **Longer time-between-overhauls (TBO)** ( 1,500 2,000 hours, though this varies by operator).

---

### **Cons**

1. **Higher Initial Purchase Cost**

- A **new or rebuilt 27DA23-M40/S4** from Farris Engineering or a reputable dealer can cost **$30,000 $50,000 **, depending on modifications.

- **Used engines** may be cheaper ( $15,000 $30,000), but **thorough inspection is critical** to avoid hidden issues.

2. **Complexity and Maintenance Requirements**

- **Fuel injection systems** require **regular tuning and calibration** (unlike carburetors, which are simpler but less efficient).

- **Electronic components** (ECU, sensors) can fail and may require **specialized knowledge** to repair.

- **Oil and filter changes** must be **strictly followed** to prevent sludge buildup (common in air-cooled engines).

3. **Limited Turbocharging Support (Without Modifications)**

- While **turbocharging is possible**, it requires **additional modifications** (intercoolers, upgraded fuel system) and may **reduce reliability** if not done correctly.

- **Stock engines are not turbocharged** adding one is a **major undertaking**.

4. **Noise and Vibration**

- Like all air-cooled flat engines, the **27DA-23M40/S4 is loud** ( 100 dB at idle, less at cruise).

- **Vibration levels** can be high, requiring **proper mounting and balancing** in the aircraft.

- Some operators report **excessive vibration** if the engine is not **properly aligned or supported**.

5. **Fuel and Oil Consumption**

- **Fuel burn** ( 6 8 GPH at cruise) is **higher than some smaller engines** but reasonable for its power.

- **Oil consumption** can be **moderate** ( 0.5 1 quart per 25 hours in some cases), requiring **frequent checks**.

- **High-quality aviation oil (e.g., Mobil Jet Oil, Shell Avgas 100LL-compatible)** is recommended.

6. **Limited Availability of Original Parts**

- While **Curtiss-Wright parts are still available**, some **aftermarket components** (e.g., specific fuel injectors, sensors) may require **special ordering**.

- **Replacement engines** can take **weeks or months** to source if needed.

7. **Potential for Detonation at High Power Settings**

- If **fuel quality is poor** or **ignition timing is misadjusted**, detonation can occur, leading to **engine damage**.

- **Must use high-octane fuel (100LL or better)** and **avoid over-revving**.

8. **Weight Considerations in Some Aircraft**

- While **light for its power**, the **27DA-23M40/S4 is heavier than some smaller engines** (e.g., Lycoming O-320).

- In **ultralight or STOL applications**, the **extra weight may reduce performance gains**.

9. **Learning Curve for Owners**

- **Fuel pressure and flow**.

- **Oil temperature and pressure**.

- **Exhaust gas temperature (EGT) and cylinder head temperatures (CHT)**.

- **Misdiagnosis of issues** (e.g., misfires, fuel pump failures) can lead to **costly repairs** if not addressed early.

10. **Inspection Challenges for Used Engines**

- **Full teardown and inspection** (if possible).

- **Verification of modification history** (e.g., were Farris upgrades installed?).

- **Check for signs of detonation, piston wear, or fuel system issues**.

- **No engine is truly "bulletproof"** even well-maintained examples may have **hidden wear**.

---

### **Conclusion**

The **Farris Engineering 27DA23-M40/S4 (Curtiss-Wright 27DA23M40S4)** is a **highly capable, fuel-injected air-cooled engine** that excels in **performance, reliability, and efficiency** for experimental and production aircraft. Its **proven track record, modular upgrades, and strong aftermarket support** make it a **popular choice** for pilots seeking **power without excessive weight**.

- **Higher upfront cost** compared to carbureted alternatives.

- **Requires more maintenance attention** than simpler engines.

- **Noise and vibration** can be an issue in some installations.

- **Used engines need thorough inspection** to avoid hidden problems.

**Pilots who want a high-performance, fuel-injected engine** with **good reliability**.

**Experimental aircraft builders** who need **flexibility in modifications**.

**Owners willing to invest in maintenance** for long-term durability.

**Aircraft where weight is a concern but power is critical** (e.g., RV series, STOL planes).

**Budget-conscious buyers** (lower-cost carbureted engines may suffice).

**Pilots who prefer "low-maintenance" engines** (e.g., Lycoming IO-36

Details:

Part Number 27DA23-M40/S4. Sells new and surplus product develops channels to purchase such. Call to use a shipping service other than the ones listed. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

All products are guaranteed to be working but may show signs of use if purchasing a used product.

part #: 27da23m40s4 prices

• $150.00-$499.00

specifications valvesplumbing:

• brand: Farris Engineering
• mpn: 27da23-m40/s4

general valvesplumbing:

• condition: Used
• Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Other Valves Manifolds

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• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 1985 71

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• started: April 8, 2026
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