MERCURY 48-49971A1 Prop Drive Sterndrive Lh Spl 3/8 23P

( Brand: Mercury ), ( Manufacturer Part Number: 48-49971A1 ), ( Part Type: Prop Drive Sterndrive ), ( Propeller Rotation: Counter ), ( Propeller Pitch: 23 )

Review MERCURY 49971a1 3/8 Inch 23p Prop Chrysler Drive Sterndrive Lh Spl fits MERCRUISER 1990–2017

The **Mercury 48-49971A1 23P Propeller** is a high-performance, precision-engineered marine propeller designed exclusively for the **Chrysler Drive 90 Sterndrive** series, specifically tailored for left-hand (LH) 17-inch outboard engines. This propeller is part of Mercury Marine s **Mercruiser** line, a brand renowned for delivering exceptional efficiency, durability, and power transfer in both recreational and performance-driven boats. Crafted from **high-grade aluminum alloy**, this three-blade propeller features a **16 3/8-inch diameter** with a **23-pitch** measurement, optimized to maximize thrust while minimizing cavitation and vibration critical factors for maintaining smooth operation and extending the lifespan of the engine and drive system. The **A1 designation** indicates a slightly aggressive blade design, ideal for boats requiring strong acceleration and towing capability, such as fishing vessels, cruisers, or performance boats where quick response and reliable power delivery are essential. The **17-spline shaft connection** ensures a secure and precise fit with the Chrysler Drive 90 s internal gearing, reducing slippage and enhancing overall efficiency. Whether used in a leisurely weekend outing or demanding high-speed maneuvers, this propeller delivers a balanced blend of speed, control, and fuel economy, making it a dependable choice for boaters who demand both performance and reliability from their Mercury-powered sterndrive. Its robust construction and aerodynamic blade geometry also contribute to reduced noise and improved fuel efficiency, ensuring a quieter, more enjoyable ride while maintaining peak performance under varying load conditions.

### **Pros and Cons of buying a Mercury 48-49971A1 (49971A1) 16 3/8" 23P Prop for a Mercury/Mercruiser Chrysler Drive 90 Sterndrive LH 17 Spl**

#### **Overview**

The **Mercury 48-49971A1 (49971A1) 16 3/8" 23P propeller** is designed for **Mercury/Mercruiser Chrysler Drive 90 (CD90) sterndrive models**, specifically those with a **17-spline shaft**. This prop is a **three-blade, fixed-pitch unit** commonly used for **fishing, cruising, and general boating** in medium-sized boats (typically 18 25 feet). Below is a detailed breakdown of its advantages and drawbacks.

---

### **Pros**

1. **Compatibility with Common Boats**

- The **Mercury CD90** is a well-known outboard replacement system, and this prop is specifically engineered for it. It fits **Mercruiser/Mercury 90-series sterndrives**, which are found in boats like the **Mercury 19 25 Pro, Sea Pro, or similar models** with a **17-spline shaft**.

- Works well with **inboard/outboard (I/O) setups**, making it a versatile choice for boats that may have been converted from outboards to sterndrives.

2. **Good Performance for Fishing & Cruising**

- The **23P pitch** is optimized for **moderate-speed cruising and fishing**, providing a balance between **acceleration, top-end speed, and fuel efficiency**.

- The **three-blade design** offers **better thrust at lower RPMs** compared to two-blade props, which is beneficial for **towing, planing, and handling heavy loads** (e.g., skiers, wake surfers, or additional passengers).

- Suitable for **shallow-water fishing** due to its **moderate rake and blade angle**, reducing the risk of ground contact damage.

3. **Durability & Reliability**

- Mercury props are **known for their quality construction**, using **high-strength stainless steel** to resist corrosion and wear.

- The **16 3/8" diameter** is a **standard size** for mid-sized boats, meaning **replacement parts and tuning options** are widely available.

- Designed to **withstand frequent use**, including **trawling, anchoring, and rough water conditions**, without excessive stress.

4. **Fuel Efficiency & Moderate Speed**

- The **23P pitch** is **not overly aggressive**, meaning it **doesn t require excessive RPMs** to achieve planing speed, which can **improve fuel economy** compared to higher-pitch props.

- Ideal for **daily use, commuting, or leisure cruising** where **smooth acceleration and reasonable top speed** are priorities.

5. **Easy to Maintain & Replace**

- **Standard bolt pattern** (common for Mercury/Mercruiser props) makes installation **relatively straightforward** for most boat owners.

- **No specialized tools required** for basic maintenance (e.g., cleaning, checking for nicks).

- **Aftermarket tuning options** (e.g., different pitch or blade adjustments) are available if performance needs change.

6. **Good for Beginners & Casual Boaters**

- The **CD90 sterndrive is a proven, reliable system**, making this prop a **safe choice for those new to Mercury/Mercruiser setups**.

- **Less aggressive than high-performance props**, so it **won t overstress the engine** if the boat is used for **general boating rather than racing**.

---

### **Cons**

1. **Not Optimized for High-Speed or Racing**

- The **23P pitch is moderate**, meaning it **won t achieve extreme speeds** (e.g., 40 mph) efficiently.

- For **high-performance or wakeboarding**, a **higher-pitch prop (e.g., 25P or 26P)** would be more suitable.

- If the boat is used for **speed trials or aggressive planing**, this prop may **limit performance**.

2. **Limited Top-End Thrust**

- While the **three-blade design improves low-end torque**, it **doesn t excel in extreme planing conditions**.

- Boats pulling **multiple skiers or heavy loads** may **struggle to maintain speed** compared to a **higher-thrust prop**.

- If the boat is **heavily loaded**, the prop may **require higher RPMs to plane**, reducing efficiency.

3. **Potential for Cavitation at High Speeds**

- If the boat **exceeds the prop s optimal speed range**, **cavitation (bubbling noise)** can occur, leading to **reduced efficiency and potential blade damage**.

- Not ideal for **constant high-speed cruising** without tuning.

4. **Slightly Older Prop Design (Potential for Wear)**

- The **48-49971A1 model is not the latest**, meaning it may **lack some modern refinements** (e.g., **hydrodynamic blade shaping** for reduced drag).

- **Blade edges may be sharper than newer models**, which could **increase wear over time** if the boat is used in **abrasive conditions** (e.g., shallow sandbars).

5. **Weight Consideration**

- Mercury props are **heavier than some aftermarket alternatives**, which may **slightly reduce maneuverability** in tight spaces.

- Not a major issue for most boats, but **smaller or lighter rigs** might feel a minor difference.

6. **Limited Customization Options**

- Unlike **aftermarket props**, this is a **stock Mercury unit**, meaning **fewer tuning options** (e.g., **different rake angles, cup sizes, or blade materials**).

- If the boat owner wants **specific performance adjustments**, they may need to **upgrade to a custom prop** later.

7. **Potential for Misalignment Issues**

- If the **sterndrive housing or shaft alignment is poor**, the prop can **wear unevenly** or **vibrate excessively**.

- Requires **regular inspection** to ensure **proper alignment** and **no bent blades**.

---

### **Conclusion**

The **Mercury 48-49971A1 (49971A1) 16 3/8" 23P prop** is a **solid, reliable choice** for **Mercury/Mercruiser CD90 sterndrive boats** used primarily for **fishing, cruising, and moderate-speed planing**. It strikes a **good balance between thrust, fuel efficiency, and durability**, making it **ideal for casual and intermediate boaters**.

- **High-speed or racing applications** (where a higher-pitch prop would be better).

- **Extreme planing or heavy towing** (where a **four-blade or higher-thrust prop** may be needed).

- **Boats that require frequent performance tuning** (since it lacks aftermarket flexibility).

If the boat is **used for general boating, fishing, or light cruising**, this prop **will perform well and last long**. If the user plans to **push the boat harder** (e.g., frequent high speeds, wakeboarding, or heavy loads), **consider a different pitch or a custom prop** for optimal performance.

---

### **Recommendation**

You have a **Mercury/Mercruiser CD90 sterndrive** and need a **replacement or upgrade**.

Your boat is used for **fishing, leisure cruising, or moderate-speed planing**.

You want a **reliable, durable, and easy-to-maintain** propeller.

You don t require **extreme speed or high-thrust performance**.

You need **higher speeds (40 mph)** opt for a **25P or 26P prop**.

You frequently **tow skiers or heavy loads** a **four-blade or high-thrust prop** may be better.

You want **custom tuning options** look into **aftermarket props** (e.g., **Mercury Marine, Volante, or custom hydro props**).

Your boat has **alignment or vibration issues** ensure the **sterndrive is properly serviced** before installing.

This is a **great stock replacement prop** for **CD90 sterndrives** in **mid-sized boats** used for **general boating**. If performance needs change in the future, **upgrading to a different pitch or a custom prop** can be done later. For most **casual to intermediate boaters**, it is a **sound investment**.

Details:

Casting Number: 48-31672-A1 15. Related Part Numbers: 072088. MPN: 48-49971A1. Brand: Mercury.

Chrysler Drive 90 model 80, 81. This PROPELLER fits may fit more Left Hand Counter Rotation. Condition: Used.

part #: 4849971a1 price

• $149.99

specifications propboapar:

• for models: Mercruiser
• for makes: Chrysler, Mercury
• for years: 1990-2017
• brand: Mercury
• mpn: 48-49971a1
• part type: Prop Drive Sterndrive
• propeller rotation: Counter
• propeller pitch: 23

general propboapar:

• condition: Used
• Parts Accessories > Boat Parts > Propellers

returns propboapar:

• policy: No Returns

seller propboapar:

• rating: 99.7%
• # reviews: 29164
• city: Suamico, Wisconsin

shipping propboapar:

• service: USPS Ground Advantage, USPS Priority Mail, UPS Ground, UPS Next Day Air Saver
• type: Calculated
• class: Standard, Expedited, One-day
• transit: 3-9 Days
• carrier: USPS, UPS
• cost: $30.35

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offer propboapar:

• quantity: 1
• options: Ship-to-home
• started: February 24, 2026
• availability: In Stock
• sold: 0

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