so what would cause my plugs to crack like this?

[MGannaway]

Champion plugs outright suck! I have switched all my airplanes at work away from them due to the ceramics breaking a lot.

[Baron Von Crowder]

and last night I pulled the plugs out of the miata, champions, and one of them has lost the electrode. How are they even in business still?

[sickpony]

Lawnmower plugs.