FuelTech NGK Racing Spark Plug R5671A-11 - 5016100681
Ultra-Cold Racing Spark Plug for Extreme Engine Conditions
The FuelTech NGK Racing Spark Plug R5671A-11 is built for serious race applications where extreme cylinder pressure, high RPM, and elevated combustion temperatures demand absolute reliability. Trusted across global motorsports, this plug is engineered to deliver consistent ignition performance under the harshest conditions.
With a nickel alloy center electrode featuring a V-groove design, this spark plug enhances ignitability and flame propagation. Combined with NGKs OE ceramic technology and a 98 percent pure copper core, it provides excellent heat dissipation and stable spark delivery even in high-output racing engines.
Engineered for High-Heat, High-Load Racing Environments
The R5671A-11 features a colder heat range than lower-number variants, making it ideal for high-boost, high-compression, and extreme performance builds where controlling combustion temperatures is critical.
- Designed for extreme racing use only
- Optimized for high cylinder pressure and high RPM engines
- Used in professional motorsports worldwide
- Suitable for turbocharged, supercharged, and race fuel setups
Advanced Construction for Reliable Spark Delivery
Every component of this NGK racing plug is engineered to maximize durability and ignition consistency in demanding conditions.
- Nickel alloy electrode with V-groove improves ignitability
- Solid copper core enhances heat transfer and conductivity
- Double platinum material grade supports durability under extreme conditions
- High-grade ceramic insulator ensures strong dielectric performance
Built for Durability and Serviceability
Designed for repeat use in racing environments, this spark plug includes features that protect your engine and simplify installation.
- Cold-rolled threads help prevent cross-threading
- Trivalent metal plating resists corrosion and seizing
- Non-removable terminal ensures a secure electrical connection
- Built for consistent performance in harsh racing conditions
Features
- NGK R5671A-11 racing spark plug design
- Nickel alloy center electrode with V-groove
- OE ceramic insulator for superior dielectric strength
- 98 percent pure copper core for heat dissipation
- Double platinum material grade for durability
- Cold-rolled threads for safe installation
- Trivalent plating for corrosion resistance
- Designed for extreme racing applications
Quick Specs
- Brand: FuelTech / NGK
- Plug Number: R5671A-11
- Service Number: R5671A-11
- Thread Size: M14
- Heat Range: 11
- Hex Size: 5/8 Inch
- Preset Gap: 0.020 Inch
- Thread Reach: 0.750 Inch
- Number of Ground Electrodes: 1
- Center Electrode Core Material: Copper
- Center Electrode Tip Material: Nickel
- Approximate Resistor Value: 1 Ohm
- Insulator Height: 50.5mm
- Material Grade: Double Platinum
- Recommended Usage: Racing Only
- Part Number: 5016100681
FAQs
What does the heat range 11 indicate?
A heat range of 11 is considered very cold, making this plug ideal for high-boost or high-compression racing engines that generate extreme heat.
Can this spark plug be used on street vehicles?
No. This plug is intended for racing use only and may not perform properly in normal street driving conditions.
Why Buy from Beefcake Racing?
Beefcake Racing is your go-to source for high-performance ignition components, FuelTech electronics, and race-proven parts. We help builders and racers achieve reliable power with components that perform under pressure.
With expert support, fast shipping, and real-world performance knowledge, we make sure you get the right parts the first time.
Email: sales@beefcakeracing.com
Phone: 1-855-827-7223
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