I am prepping the recently acquired TR4 for the Turkey Bowl at Summit Point
(Thanksgiving weekend) and thought I would get some new plugs. The current
plugs are NGK BP8HS-10. These come up in google searches as being used for
marine applications, though there's nothing in the part number that indicates
that use.
Engine is about 170 psi compression, 12:1, guessing from the cam that the
engine will be running between 4,000 and 7,000 RPM. Plugs are running
light-medium brown, so apparently about the right heat range.
Recommendations for plugs, or should I stick with what I've got?
Here's the current spec:
non-resistor plug
Thread Size: 14mm
Thread Reach: 12.7mm (1/2")
Hex Size: 13/16"
Heat Range: 8
Gap: 1.02mm (.040")
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