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Sierra 18-8813-1 MagForce Premium Marine Spark Plug Wire Set 4-Cylinder Thunderbolt Ignition

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-8813-1
06/02/2036 7:52 AM
Sale Price

$189.54

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Usually delivered within 2 days

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Product Details

The Sierra 18-8813-1 MagForce Premium Marine Spark Plug Wire Set is a high-performance ignition wire set engineered specifically for marine applications. Built to meet or exceed OEM standards, this wire set delivers reliable spark delivery, superior RFI/EMI suppression, and long-lasting durability in the harsh marine environment. It replaces Volvo OEM part number 875571 / 875571-2 and is compatible with Thunderbolt-type ignition systems. The set uses 7mm (0.276") wire and includes a coil wire.

Key Features:

  • MagForce Magnetic Suppression Core — Application-specific design for optimal spark delivery and ignition performance
  • Kevlar® reinforced inner core — Ensures conductor integrity and provides maximum durability and long service life
  • Durable stainless steel wound conductor — Delivers maximum horsepower and peak engine performance
  • Premium silicone jacket and boots — High-tear-strength silicone protects to 500°F for ultimate high-temperature resistance
  • Superior RFI/EMI suppression — Electronics-friendly design protects GPS, VHF, Loran, and other sensitive onboard electronics
  • Corrosion-resistant stainless steel terminals — Spark plug and distributor terminals resist corrosion for maximum conductivity
  • OE-style sealed boots — Provide a moisture, heat, and dirt barrier at every connection point
  • Compatible with Thunderbolt-type ignition systems
  • 7mm wire diameter — Includes coil wire
  • OEM Replacement: Volvo 875571 / 875571-2

Sierra's MagForce wire sets are designed to work with any original equipment or aftermarket marine ignition system, making them an ideal choice for maintaining and restoring ignition performance on 4-cylinder marine engines.

Products specifications

Type

Spark Plug Wires

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