Sierra 18-8842-1 Spark Plug Wire Set, 8-Cylinder Conventional Ignition, White

The Sierra 18-8842-1 is a complete spark plug wire set built for 8-cylinder marine engines with a conventional distributor ignition. Each wire uses a durable stainless steel wound conductor engineered for maximum horsepower and engine performance while providing superior RFI suppression for sensitive onboard electronics. A Kevlar core runs through every wire for long-term durability and long service life, and the set is finished with premium silicone jacketing and silicone boots that hold up under high underhood temperatures. Corrosion resistant stainless steel terminals at both the spark plug and distributor ends maintain strong conductivity in the marine environment, where moisture and salt air quickly degrade lesser materials.

The set is supplied in white and includes wires sized for a full 8-cylinder conventional distributor layout: one coil wire, two individually sized spark plug wires, and two pairs of matched-length spark plug wires, so every cylinder position is covered without cutting or splicing. This makes the 18-8842-1 a straightforward, complete-set replacement when an aging or cracked plug wire set is causing misfires, rough idle, or ignition noise on an 8-cylinder inboard or sterndrive engine running a conventional (non-electronic) distributor.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8842-1
• Cylinders: 8
• Ignition Type: Conventional
• Color: White
• Material: Silicone, Stainless Steel
• Connector Type: Spark Plug, Distributor
• Cable Type: Spark Plug Wire
• Coil Wire Length: 9 inches (1)
• Spark Plug Wire Lengths: 31 inches (1), 40 inches (1), 30 inches (2), 36 inches (2), 43 inches (2)
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 2.13 pounds
• UPC: 808282194673

Frequently Asked Questions

How many cylinders does the Sierra 18-8842-1 wire set cover? The 18-8842-1 is an 8-cylinder set, supplying one coil wire and seven spark plug wires sized for a full 8-cylinder conventional distributor engine.

Will this set work with an electronic distributor? No. The 18-8842-1 is designed specifically for conventional (non-electronic) distributor ignition systems, not electronic distributor setups.

What are the individual wire lengths in the set? The set includes one 9 inch coil wire, one 31 inch spark plug wire, one 40 inch spark plug wire, two 30 inch spark plug wires, two 36 inch spark plug wires, and two 43 inch spark plug wires.

What material are the wires made from? Sierra 18-8842-1 wires use a stainless steel wound conductor with a Kevlar core, wrapped in silicone jacketing with silicone boots at each end.

Why use a stainless steel wound conductor instead of standard copper core wire? The stainless steel wound conductor in the 18-8842-1 is built to support maximum horsepower and engine performance while providing superior RFI suppression, protecting sensitive onboard electronics from ignition interference.

What color is this spark plug wire set? The 18-8842-1 spark plug wire set is white.

Does the terminal material resist corrosion in a marine environment? Yes, the 18-8842-1 uses corrosion resistant stainless steel terminals at the spark plug and distributor connections for reliable conductivity in salt air and moisture.

How much does the 18-8842-1 wire set weigh? The Sierra 18-8842-1 weighs 2.13 pounds.

Can the silicone boots handle high underhood temperatures? Yes, the 18-8842-1 uses premium silicone jacketing and silicone boots rated for high temperature protection under the hood or engine cover.

What ignition symptoms would call for replacing this wire set? Cracked, brittle, or arcing plug wires that cause misfires, rough idle, or ignition-related RFI noise are the typical reasons to replace an 8-cylinder set like the 18-8842-1.

Is the coil wire included in the set or sold separately? The coil wire is included in the 18-8842-1 set as one of the seven total wires supplied.