Sierra 18-8811-1 MagForce Spark Plug Wire Set, 4 Cylinder EST Electronic Ignition, Mercury Marine and OMC Engines

The Sierra 18-8811-1 MagForce spark plug wire set is a 4 cylinder wire set built for EST electronic ignition systems on Mercury Marine and OMC engines. Each wire uses a Kevlar core for long-term durability combined with a stainless steel wound conductor that supports maximum horsepower and consistent engine performance. The wires are covered in premium silicone jacketing with silicone boots, giving the set high temperature protection where heat exposure around the engine block and exhaust is greatest. Superior RFI suppression is built into the wire construction, which helps protect sensitive onboard electronic systems from ignition interference, an important consideration on engines running EST electronic ignition. Corrosion resistant stainless steel spark plug and distributor terminals maintain strong conductivity in the marine environment, where moisture and salt exposure accelerate terminal corrosion on lesser wire sets. The set includes one complete wiring and plug set sized for a 4 cylinder configuration. This is a direct fit replacement wire set for the applicable Mercury Marine and OMC 4 cylinder engines using EST electronic ignition, restoring reliable spark delivery without re-engineering the ignition harness.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8811-1
• Product Type: Spark Plug Wire Set
• Application: 4 Cylinder, EST Electronic Ignition
• Compatible Engines: Mercury Marine and OMC Engines
• Core Material: Kevlar
• Conductor: Stainless Steel Wound
• Jacketing and Boots: Silicone
• Terminal Material: Corrosion Resistant Stainless Steel
• Connector Type: Spark Plug, Distributor
• Number of Items: 1
• Item Dimensions: 9 x 7.25 x 3 inches
• Weight: 0.87 pounds
• UPC: 808282194406
• Mallory Cross Reference: 9-28028

Fitment

Designed for 4 cylinder Mercury Marine and OMC engines equipped with EST electronic ignition.

Replaces (OEM)

Cross references to Mallory part number 9-28028.

Frequently Asked Questions

What engines does the Sierra 18-8811-1 spark plug wire set fit? It is built for 4 cylinder Mercury Marine and OMC engines running EST electronic ignition.

How many wires come in the 18-8811-1 set? The set is a complete 4 cylinder wiring and plug set, sized as one unit for the full ignition harness rather than sold as individual wires.

Is there an OEM or competitor cross reference for part 18-8811-1? Yes, Sierra part 18-8811-1 cross references to Mallory part number 9-28028.

What material is the conductor made from in this wire set? The 18-8811-1 set uses a stainless steel wound conductor around a Kevlar core, which is built for maximum horsepower and consistent engine performance.

Will these wires hold up to engine heat? Premium silicone jacketing and silicone boots on the 18-8811-1 set provide high temperature protection in areas of the engine bay where heat exposure is greatest.

Do these spark plug wires cause interference with onboard electronics? No, the 18-8811-1 MagForce set includes superior RFI suppression to protect sensitive electronic systems from ignition interference.

What are the terminal ends made of on the 18-8811-1 wire set? Corrosion resistant stainless steel spark plug and distributor terminals are used, maintaining strong conductivity in a marine environment.

What are the dimensions of the packaged 18-8811-1 wire set? The set measures 9 x 7.25 x 3 inches as packaged.

How much does the 18-8811-1 spark plug wire set weigh? It weighs 0.87 pounds.

Is the 18-8811-1 set genuine Sierra or aftermarket? It is a genuine Sierra MagForce spark plug wire set, part number 18-8811-1, not a generic aftermarket copy.

What is included when I order the 18-8811-1 set? One complete wiring and plug set for a 4 cylinder EST electronic ignition engine is included.