lifetime of Tempest massive spark plug

[iflyvfr]

What is "footballing?"

The center electrode takes an oval shape as it wears.

 

[Tom-D]

Doesn't happen here.

 

[iflyvfr]

Wish mine looked that good.

 

[Stephen Poole]

The center electrode takes an oval shape as it wears.

Ah. Thanks.

 

[Dan Thomas]

Doesn't happen here.

Those go square when they erode. I had them in a couple of A-65s years ago.

 

[yetti]

Were they cleaned with small sand or glass blasting media? Tempest says it is a NO-NO and will cause early failure. Lots of good info in the linked PDF.

EDIT: Tempest allows glass beads, per the aforementioned PDF, but require a minimum size to avoid erosion of the enamel that holds the center electrode.

Never cleaned. The center electrode had a faulty weld.