RAREELECTRICAL Propeller Alpha Mag Mpi Spline 15.5X13P
fits model: 350, 300, Mercruiser. year: 1988–1998.
( Brand: Rareelectrical ), ( Manufacturer Part Number: 1511-155-13G2 ), ( Part Type: Propeller ), ( Warranty: 1 Year ), ( California Prop 65 Warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov ), ( Country Of Origin: Tw ), ( Rotation: Right Hand ), ( Source: Aftermarket )
Review RAREELECTRICAL Propeller Alpha One Mag Mpi 15 Spline fits MERCRUISER 350 300 1988–1998
The **Mercruiser Alpha 350 MPI 15 Spline Propeller (Part Number: 1511-155-13G2, Dimensions: 15.5" x 13")** is a high-performance, precision-engineered propeller designed exclusively for Mercury Marine s Alpha 350 MPI (Multi-Pulse Injection) inboard engines, spanning the model years 1988 through 1998. Crafted from marine-grade stainless steel, this propeller is built to deliver exceptional efficiency, reliability, and durability in both recreational and performance-driven applications. Its **15-inch diameter and 13-inch pitch** combination strikes an optimal balance between speed and torque, making it ideal for boats ranging from sportfisherman to cruisers, where smooth acceleration, fuel economy, and reduced vibration are paramount. The **300 spline shaft connection** ensures a secure, vibration-dampening fit, reducing wear on the engine s transmission while maximizing power transfer to the water. This propeller s **three-blade design** enhances hydrodynamics, minimizing cavitation and improving overall thrust, which is particularly beneficial for boats operating in varying load conditions, from light trolling to full-throttle cruising. Whether used on a classic Mercury Alpha-powered vessel or as a replacement for a worn or damaged original, this propeller restores peak performance, ensuring a quieter, more responsive ride while extending the lifespan of the engine s drivetrain. Its compatibility with the Alpha 350 MPI s advanced fuel injection system further enhances throttle response and fuel efficiency, making it a sought-after upgrade for enthusiasts looking to revive or optimize their older Mercury-powered boats.
### **Pros and Cons of buying a 1511-155-13G2 (15.5x13P) Propeller for a Mercruiser Alpha 350 MPI (1988 1998, 15 Spline, 300 HP)**
#### **Pros**
1. **Proven Performance for the Alpha 350 MPI**
- This propeller is specifically designed for the Mercruiser Alpha 350 MPI engine, which was common in boats from 1988 to 1998. The 15.5x13 pitch is optimized for the torque and power output of this engine, providing a balance between speed and efficiency.
- The **15 spline shaft** compatibility ensures a secure fit, reducing the risk of slippage or damage.
2. **Balanced Speed and Fuel Efficiency**
- The **15.5-inch diameter** offers a good trade-off between acceleration and cruising speed, making it suitable for both planing and partial planing conditions.
- The **13-inch pitch** is moderate enough to prevent excessive fuel consumption while still providing decent top-end speed, typically around **25 30 knots** depending on boat weight and load.
3. **Durability and Reliability**
- The **13G2 material** (likely a high-strength stainless steel or nickel-aluminum-bronze alloy) is designed for marine use, resisting corrosion and wear better than cheaper propellers.
- The **three-blade design** provides good thrust while minimizing cavitation, which is beneficial for engines like the Alpha 350 that can be prone to vibration issues.
4. **Compatibility with Common Boat Types**
- This propeller works well on **mid-sized cruisers, fishing boats, and performance cruisers** from the late '80s and '90s, which often used the Alpha 350 MPI.
- If your boat is in the **20 30-foot range**, this propeller is a solid choice for maintaining performance without overloading the engine.
5. **Easily Available and Affordable**
- As a **common OEM or aftermarket propeller** for this engine family, it is widely stocked by marine suppliers, making replacements or upgrades straightforward.
- Pricing is reasonable compared to high-performance propellers, making it a cost-effective option for owners who want reliability without excessive expense.
6. **Reduced Vibration and Smooth Operation**
- The **balanced design** of the 15.5x13P helps minimize engine vibration, which is particularly important for the Alpha 350 MPI, known for being sensitive to propeller mismatch.
- Properly matched propellers reduce stress on the engine mounts and transmission, potentially extending their lifespan.
---
#### **Cons**
1. **Limited Top-End Speed**
- While the 15.5x13P is efficient, it is not optimized for **high-speed planing**. Boats with this propeller may struggle to reach **30 knots** unless the hull is well-designed for speed.
- If you frequently tow or carry heavy loads, you may experience **reduced acceleration** compared to a higher-pitch propeller.
2. **Potential for Cavitation at Higher Speeds**
- If the boat is heavily loaded or the engine is tuned for higher RPMs, the propeller may develop **cavitation**, leading to noise, vibration, and reduced efficiency.
- This is more likely if the boat s **transom rise** is too high or the propeller is not perfectly aligned.
3. **Not Ideal for Extreme Conditions**
- In **rough water or heavy seas**, the 15.5x13P may not provide the best maneuverability or hole-shot capability compared to a **lower-pitch, larger-diameter propeller**.
- For **deep-V hulls or performance boats**, a slightly different pitch (e.g., 14 15 inches) might offer better planing characteristics.
4. **Wear Over Time**
- Like all propellers, this one will **wear down** over time, especially if used in abrasive conditions (e.g., shallow water, debris). Replacement intervals may be shorter if the boat is used frequently in harsh environments.
- **Blade erosion** can reduce efficiency, requiring periodic inspections.
5. **Potential for Mismatch with Modified Engines**
- If the Alpha 350 MPI has been **tuned for higher horsepower** (e.g., through turbocharging or other modifications), the stock propeller may not be optimal.
- A **higher-pitch propeller (e.g., 16x12 or 17x11)** might be better for forced induction setups, but this would require recalibration of the engine s performance.
6. **Installation and Alignment Challenges**
- Improper installation (e.g., **misalignment, incorrect torque on the nut, or bent shaft**) can lead to **vibration, premature wear, or even propeller failure**.
- If the boat has been through **accidents or rough handling**, the propeller shaft or strut may need inspection to ensure compatibility.
---
### **Conclusion**
The **1511-155-13G2 (15.5x13P) propeller** is a **solid, reliable choice** for a **Mercruiser Alpha 350 MPI (1988 1998, 15 spline, 300 HP)** in most standard cruising and fishing applications. It strikes a **good balance between speed, fuel efficiency, and durability**, making it suitable for **mid-sized boats** that spend time both at anchor and under way.
However, if your boat is **heavily loaded, frequently towed, or used in high-performance scenarios**, you may want to consider:- A **slightly higher pitch (e.g., 16x12)** for better planing efficiency.
- A **larger diameter (e.g., 16.5x12)** if the boat has a **flatter hull** and needs more thrust at lower speeds.
- A **four-blade propeller** if vibration is a persistent issue (though this may reduce top speed slightly).
For **most standard owners**, this propeller is an **excellent OEM replacement** that will provide **consistent performance without excessive maintenance concerns**.
### **Recommendation**
- **Buy it if:**- You need a **reliable, stock-replacement propeller** for daily cruising or fishing.
- Your boat is **not heavily modified** and operates in **moderate conditions**.
- You want a **balance of speed and fuel efficiency** without overcomplicating maintenance.
- **Consider alternatives if:**- You **frequently tow or carry heavy loads**, in which case a **higher-pitch propeller (e.g., 16x12)** may improve acceleration.
- Your boat is **modified for higher horsepower**, requiring a **propeller tuned for forced induction**.
- You experience **excessive vibration or cavitation**, suggesting a **different pitch or blade design** would help.
**Final Verdict:** The **15.5x13P is a safe, practical choice** for the Alpha 350 MPI in its original form, but always **verify shaft condition, alignment, and boat load** before installation to ensure optimal performance.
Details:
Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but designed to function same as - if better than. As a parts distributor we mostly sell aftermarket any OEM would be noted as such. 15.5x13P Propeller Fits Mercruiser Alpha One 350 Mag MPI 15 Spline 300 1988 -1998: Replaces Part Numbers Specifications. All parts sold are new.
part #: 151115513g2 prices
- $195.24-$249.37
specifications ignitionstartin:
- for models: 350, 300, Mercruiser
- for years: 1988-1998
- brand: Rareelectrical
- mpn: 1511-155-13g2
- part type: Propeller
- warranty: 1 Year
- california prop 65 warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov
- country of origin: Tw
- rotation: Right Hand
- source: Aftermarket
returns ignitionstartin:
- time: 30 Days
- paid by: Seller
- policy: Returns Accepted
offer ignitionstartin:
- availability: In Stock
- started: February 9, 2026
- sold: 0
- quantity: 6
- options: Ship-to-home
shipping ignitionstartin:
- cost: $0.00
- transit: 3-8 Days
- type: Fixed
- class: Economy, Standard, Expedited, One-day
- service: Economy, Standard, Expedited, Overnight
seller ignitionstartin:
- # reviews: 120570
- rating: 98.9%
- city: Atlanta, Georgia
payments ignitionstartin:
- other
- wallet: Paypal
- credit card: Discover
general ignitionstartin:
- Boat Parts > Inboard Engines Components > Ignition Starting Systems
- condition: New
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