JP1738's Stocker and S/G car

[JP1738]

Originally Posted by cad

I noticed my AR3934 plugs doing the same thing last season.... I dont know the cause, as nothing had changed with my combo after the dyno. Switching back to NGK this season.

Yeah I need to do better about checking these plugs. I've been running that brand for a while and the center electrode always wears down like this after a period of time. Mine gets quite a lot of abuse between quarter-mile racing and nitrous for index racing. Not to mention if all goes to plan, I'll make 200-250 runs in it this year. I try to change them out twice a year to avoid the engine breaking up as it often does when the gap grows to this size. If I haven't changed them out in time, it'll typically let me know.