Spark plug questions - ZR-1 Net Registry Forums

scottfab · 04-02-2014

This from a Delphi Spark Plug Engineer.

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Additionally, always remember these three things when installing new plugs: 1) Gap is important! 2) Installation torque is critical for proper heat dissipation. Tapered seat plugs should be installed at 11-15 lbs/ft and flat seats at 18-22 lbs/ft in cold aluminum cylinder heads. Reduce these specs by 30-35% if using a light coating of nickel or copper based anti-seize compounds. 3) A light coating of silicone grease inside the spark plug boot will increase the protection against arcing over (flashover).

Regards,

Mark Weaver
Delphi Spark Plug Engrg.

04-02-2014	#20
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,193	Re: Spark plug questions This from a Delphi Spark Plug Engineer. ************************************ .....snip.... Additionally, always remember these three things when installing new plugs: 1) Gap is important! 2) Installation torque is critical for proper heat dissipation. Tapered seat plugs should be installed at 11-15 lbs/ft and flat seats at 18-22 lbs/ft in cold aluminum cylinder heads. Reduce these specs by 30-35% if using a light coating of nickel or copper based anti-seize compounds. 3) A light coating of silicone grease inside the spark plug boot will increase the protection against arcing over (flashover). Regards, Mark Weaver Delphi Spark Plug Engrg. __________________ Scott Vett owner since 1979._It's about the car and the people**