Brisk Silver Racing RR12S Spark Plugs 4 Pack - Ford Focus ST 2013-2018, 2015+ Mustang 2.3L, Focus RS - 2 Step Colder

The Brisk RR12S spark plugs have a colder heat range compared to the stock spark plugs and a non-projected tip for an additional decrease in spark plug firing tip temperature. For modified 2.0L, 2.3L & 3.5L Ford EcoBoost engines. With a Non-projected tip tip design.

Spark Plug Heat Range

Comparing identical spark plug types, the difference from one heat range to the next is the ability to remove approximately 70°C to 100°C from the spark plug center electrode and ceramic tip. A projected style spark plug firing tip temperature is increased by about 15°C to 25°C.

Heat range is the measure of how fast the spark plug tip dissipates combustion heat. It must do this in a precise and controlled manner so the spark plug will:

• Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation.
• Run hot enough to burn off combustion deposits that would otherwise collect on the insulator tip and cause fouling that results in misfire.
• Adapt to specific engine characteristics and widely varying driving/load conditions.

Key Benefits and Applications of Brisk Silver Racing Spark Plugs

• Silver is the best Electric and Heat Conductor - the best material for performance and racing spark plugs
• Superior Ignition Ability Increases Engine Power
• Lower Required Supplied Ignition Voltage
• Good Resistance to Fouling and Easier Starts
• Race Engines and Engines with Hard to Ignite Fuels
• Supercharged / Turbocharged / Nitrous engines
• Excellent for Total Loss Ignition Systems
• Excellent Spark Plug Choice for any Vehicle, Tuned or Modified, even for High Mileage Vehicles and Vehicles With Oil Consumption Problems
• Two step colder Brisk Racing spark plugs are recommended for Larger turbo applications running higher boost levels and built internals.
• Recommended Gap is .026" ~ .028"