Mercruiser V8 HEI ignition system

For GM, Volvo, Mercruiser, OMC and other engine applications.

Sierra wires are “Electronics Friendly”. They protect your GPS, VHF, Loran and all of your other electronic devices and electronic engine controls from RFI and EMI. They work with any original equipment or aftermarket ignition system.

WHY REPLACE YOUR WIRE SETS
• Improves engine efficiency
• Improves gas mileage
• Meets or exceeds original equipment performance
• All-silicone wire sets jackets for high heat protection
• For the best ignition wire set, always look for a silicone jacket

SIERRA’S WIRE
• High-tear-strength silicone jacket protects to 500°F
• Unique mag wire conductor delivers the hottest spark
• Reinforcing mesh increases the tensile strength of the wire
• Aramid inner core ensures conductor integrity Sierra.

MARINE BOOTS AND TERMINALS
• Pure silicone boots provide maximum heat and
• Moisture protection
• Stainless steel snap-lock terminals resist corrosion
• Special crimp design helps prevent terminal pull-off

The purpose of the ignition wire is to deliver all of the energy that the ignition system can produce from the coil(s) to the spark plug.
The difficulty in delivering all of the energy under all conditions without causing problems due to Radio Frequency Interference (RFI) is what differentiates one type or brand of ignition wire from another.
The electrical property that primarily affects this is resistance. In this case it is the resistance to the flow of electrons (electricity) and is measured in ohms. When you hear or read of an ignition wire with 500 ohms of resistance it means 500 ohms per foot.

The perfect ignition wire would have zero ohms resistance and zero RFI. The problem in producing the perfect wire is that resistance is inversely proportional to RFI. That is, as you lower the resistance toward zero, it produces more RFI.

The ideal situation is to have the lowest resistance wire while keeping RFI below levels that would cause problems with computerized engine controls (SAE has specifications for this) and without violating FCC regulations.