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Insul-Boots™ spark plug boot protectors are made from a conventional thermal-barrier material that helps reflect heat. Which one to use in your application will depend on the type of engine you have, how much heat is produced, and what type of damage you need protection from. Heatshield Products offers several automotive heat shields and spark plug wire protection products designed to protect wires and spark plug boots from heat damage.
#How to install spark plugs with headers on a 350 full
The benefit of a thermal-barrier spark plug wire shield is that heat-induced electrical resistance will be reduced significantly, meaning your ignition system won’t have to work as hard, and the full spark energy will be delivered to the spark plugs. That means it takes more time for the energy to travel through the wire, and a certain amount of the energy is restricted and never actually reaches the spark plug. Whenever a wire that conducts electrical energy is exposed to high heat, the resistance of that wire increases. This uncontrolled detonation can lead to serious engine damage and even underhood fire.Ĭomplete burn-through is not the only problem to consider when looking at spark plug wire heat shields. This could cause you to lose a race or end up stuck on the side of the road - not to mention the not so small fact that it could also potentially cause engine detonation or backfire situation due to a buildup of unburnt fuel in various cylinders and intake runners. Second, when a spark plug boot melts, it can create an ignition misfire/no-fire problem.
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First, you have the cost of replacing the wires, and in race applications could easily cost more than $100. Types of Spark Plug Damage and Why Spark Plug Wire Heat Shields Workīefore figuring out the best spark plug wire and spark plug boot protectors for your street or racecar, let’s look at the types of potential damage and associated costs when hot exhaust and spark plug wires share close quarters. This article will help you pick the best spark plug wire and spark plug boot heat shields and sleeves, guiding you through the maze of protection options so you can make a choice that is both cost-effective and right for you. Almost anyone with headers on their car, truck or racecar has experienced burned spark plug wires or has melted through a spark plug boot or two.