Watched the EAA webinar about spark plugs the other night that Mike Busch led. Discussion was limited to aviation plugs rather than the automotive plugs that I use, but was surprised to hear that he had a strong opinion that Champion spark plugs should be avoided due to persistent problems with the internal resistor being bad. This results in resistance values way over the optimal 1-2k ohms (up to 5k is ok). At a minimum, resistance values should be checked regularly with these plugs, as there is a potential for some bad juju to occur when the resistance values get real high. Check the webinar for the details. Just thought I would spread the word.
Erich
Erich