EMPI 8.5mm HEI Spark Plug Wire Set with Coil Wire | VW Type 1 Air-Cooled | High-Energy Ignition (00-9442-6)

EMPI 8.5mm HEI Spark Plug Wire Set with Coil Wire — VW Type 1 High-Energy Ignition

EMPI 8.5mm HEI-style spark plug wire set with matching coil wire, built for high-performance, high-energy ignition systems on VW Type 1 air-cooled engines. The thicker 8.5mm diameter, upgraded silicone insulation, and HEI-style boots make this the right wire set for engines running MSD, Crane, Pertronix Ignitor II/III, or other high-output electronic ignition. EMPI part #00-9442-6.

High-energy ignition produces a significantly hotter spark than stock points or basic electronic modules, and that hotter spark needs thicker, better-insulated wires to deliver energy to the plug without breakdown, crossfire, or radio interference. The 8.5mm silicone wires hold up to higher voltage, resist heat breakdown, and the HEI-style boots seal tightly around the plug and coil tower to eliminate moisture-induced misfires.

Vehicle Fitment

• VW Beetle: Type 1 air-cooled engines running high-output electronic ignition
• VW Karmann Ghia, Type 3 & Thing: Type 1 engine layout
• VW Bus / Transporter: through 1971 (Type 1 engine)
• Dune buggies, sand rails & kit cars: with performance ignition setups

Key Features & Benefits

• 8.5mm diameter: Thicker than 7mm stock for high-voltage, high-energy ignition.
• Silicone insulation: Resists heat breakdown and prevents crossfire between adjacent cylinders.
• HEI-style boots: Seal tightly at the plug and coil tower to eliminate moisture-induced misfires.
• RF suppression: Manages radio-frequency interference for cleaner operation.
• Complete set: Four plug wires plus the coil-to-distributor wire — everything from coil to plug.

Technical Specifications

• Diameter: 8.5mm (vs. 7mm stock)
• Style: HEI (High Energy Ignition)
• Insulation: Silicone
• Boots: Custom HEI-style spark plug boots, plus matching coil wire boot
• Sold as: Complete set (4 plug wires + coil wire)
• Part number: 00-9442-6

Frequently Asked Questions

• Will these work with stock points ignition? Functionally yes, but you don't need them. Stock points ignition produces moderate spark voltage that standard 7mm Bosch wires handle perfectly; the 8.5mm HEI wires are designed for the higher voltage of performance ignition systems.
• Do these reduce radio interference? The 8.5mm HEI wires include suppression to manage RF interference. They're generally well-behaved with car audio installations, though high-output ignition systems always produce more RF noise than stock setups.
• Will they fit my Type 4 engine? The Type 1 wire set has specific lengths and termination styles for the Type 1 engine layout. For Type 4 (1972+ Bus, 411, 412, Porsche 914), confirm fit before ordering.
• Are the boots heat resistant? Yes. Silicone HEI boots withstand the high temperatures of an air-cooled engine bay far better than rubber boots, which crack and harden over time.
• Do they come with a coil wire? Yes. The set includes the four spark plug wires plus the coil-to-distributor wire.

Explore Related Categories

Ignition, All VW Air-Cooled, EMPI