Spark Plug Question NA Gen3

[FoMoCo]

I have a 2019 Mustang GT, A10 car, e85. Looking to replace plugs with NGK Iridium. Confused on weather to use 6509 or 6510. Info is contradictory based on which site you look at. Any help is appreciated. I have read the 6510 may be better since the Gen 3 motor is higher compression compared to the Gen 2 motors.

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[86pagt]

Subscribing… looking for the same info. 2019 running E85 99% of the time

 

[Snellemin]

Taken from the NGK website.

• When using an ethanol blend fuel with high ethanol content in high-performance applications, a colder heat range may be necessary. The spark timing can be advanced further because ethanol blend fuel has a higher resistance to knock (higher octane). Due to the decreased knock, there will be less audible “warning” from knock before the spark plug overheats and pre-ignites.

• Advancing ignition timing by 10° will cause the spark plug tip temperature to increase by approximately 70° to 100°C.
• A colder heat range spark plug may be necessary if the ignition timing has been advanced to near the knock level. Higher cylinder temperatures near the knock level will bring the spark plug firing end temperature closer to the pre-ignition range.

 

[Zrussian13]

Use the 6510s.

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