The Nissan Skyline R33 and R34 RB20 and RB25 engines demand precision and reliability when it comes to ignition, making the correct spark plug choice vital for both performance and longevity. The factory-specified NGK PFR4G-11 plug, rated at heat range 4, is designed to operate at the proper temperature threshold to prevent fouling in naturally aspirated applications. This hotter plug retains more heat, allowing engines with lower combustion temperatures to maintain efficient combustion and reduce the risk of carbon buildup over time. For daily-driven Skylines or lightly modified setups, this plug strikes the right balance, ensuring smooth operation and consistent power delivery.
Using the wrong spark plug can compromise engine health. An overly cold plug may not reach self-cleaning temperatures, leading to fouling and misfires, while a plug that runs too hot risks detonation or pre-ignition under demanding conditions. That’s why selecting the correct OEM-specified heat range is critical to keeping your RB engine running strong. With the NGK PFR4G-11, owners can trust they are using the same proven design Nissan engineered for these iconic models, ensuring not only reliability but also protection against potential long-term damage.
At Terra Firma Automotive, we provide genuine Nissan Skyline spark plugs that deliver factory performance and peace of mind. Whether you’re restoring a stock R33 or maintaining your daily-driven R34, the right spark plug is the foundation for reliability and performance.
- Not for Single Cam RB20E
- Sold as each, 6 required
- Fits Both Turbo and Non-Turbo Applications
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