Mercury – SpitFire 4-Blade Aluminum Propeller | 14” Diameter x 17” Pitch | Right-Hand Rotation | 4 Blades | Aluminum | Polished Finish |8M0084494

Overview

Some props just feel different the moment the throttle goes down —smoother, quicker, and more connected. That’s exactly the experience you get with the Mercury SpitFire 4-Blade Aluminum Propeller (Part Number 8M0084494). Built for boaters who demand more than average, it offers the lift and grip of a four-blade without sacrificing the top-end speed that makes a three-blade so appealing. It’s a prop that responds instantly, carves through turns with precision, and gives you that steady confidence that only comes from years on the water. Whether you’re cruising to your favorite cove or cutting across a choppy lake, this prop keeps the ride balanced, powerful, and predictable.

Key Features

• Diameter and Pitch: 14” Diameter x 17” Pitch
• Rotation: Right-Hand
• Blade Count: Four blades for optimal lift and stability
• Material: Patented Mercalloy aluminum alloy — strong yet forgiving
• Finish: Polished aluminum for smooth performance and clean looks
• Hub System: Flo-Torq II Hub Kit (Part Number 835257K1) included for drivetrain protection
• Design Details: Aggressive blade geometry engineered for fast planing and precise handling

Engine & Boat Compatibility

• Designed for Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards
• Fits Mercury and Mariner 135–300 HP TwoStroke and FourStroke outboards
• Works with MerCruiser Alpha One and Bravo One sterndrives
• Performs exceptionally on runabouts, fishing boats, and pontoons, giving consistent grip and steady lift across varied conditions

Performance Benefits

• The SpitFire 14x17 feels alive when it hits the water. Its four-blade geometry grabs hold and doesn’t let go, delivering 16–25% faster acceleration than a typical three-blade prop. You’ll feel the difference right away — the bow rises smoothly, the boat planes faster, and you’re in full control without the usual slip or lag. Once you’re cruising, the ride stays composed and quiet, even when the water gets unpredictable.
• Durability is built into its DNA. The Mercalloy aluminum alloy gives you strength where it counts and a little forgiveness when the lake gets shallow. Add the Flo-Torq II Hub Kit, and you’ve got a built-in safeguard that absorbs most minor impacts to protect your drivetrain. It’s a combination that makes boating simpler, smoother, and far more enjoyable. Maintenance stays easy, performance stays sharp, and you’ll wonder why you didn’t switch sooner.

Why is this prop is a strong choice vs. alternatives?

If you’re deciding between a stainless prop and aluminum, the Mercury SpitFire 4-Blade Aluminum Propeller hits that sweet spot — performance that rivals stainless without the heavy cost. It’s Mercury OEM quality, meaning every angle, curve, and hub fit has been tested by the same engineers who design Mercury engines. That means reliability you can feel and performance you can trust.

It’s versatile enough for different boats and power levels, easy to maintain, and built to handle both saltwater and freshwater days. If you want a propeller that’s quick to respond, easy on the budget, and proven on the water, the SpitFire is the real deal — no gimmicks, just genuine performance.

FAQ

Q1: Which Mercury engines does the SpitFire 4-Blade fit?

It fits Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards, 135–300 HP TwoStroke and FourStroke outboards, and MerCruiser Alpha One and Bravo One sterndrives.

Q2: What makes this propeller different from other Mercury options?

The SpitFire blends the lift and control of a four-blade with the speed of a three-blade, giving you better acceleration, grip, and top-end balance without compromise.

Q3: How do I know if this pitch or size is right for my boat?

If your engine runs comfortably within its recommended RPM range using a 17” pitch prop, this model is an excellent choice. For the best results, refer to your engine manual or local Mercury dealer.

Q4: Can this prop be used in both saltwater and freshwater?

Yes. The aluminum alloy and finish are designed for both, but rinsing after saltwater use helps preserve the polished surface and performance.

Q5: What hub system does it use?

It includes the Flo-Torq II Hub Kit (Part Number 835257K1), which cushions your drivetrain from most minor impacts to help prevent damage.