Anyone know how to break the porcelain off/out of this plug? Trying to get it flush
with the outer metal rim. Tried using an angle grinder and that seems to take
forever (while chewing up the disc), Used a hammer and a pick and that just dented
the pick, then used a bigger hammer , and still nothing...

Anyone have any ideas?

Part in the red circle is what I am asking about

 

Industrial ceramic is harder than most metal cutting surfaces... you need a blade made for ceramic tile; carbide or diamond.

Wouldn't it be easier to do with the plug out?

 

they make a hack saw blade with diamond particles glued to it. why does it need to actually be flush? can't u just keep it as is if ur using it to plug up the hole?

 

Diamond disc/blade and water to stop the compound (usually just mild steel) holding the diamonds in from melting and detaching from the blade. Why are you doing this? That ***** animal.

 

I will run up to the lab tomorrow and use the wet diamond disc they have up there. I know that
thing would chew anything up (so says my knuckles), but wanted to see if I could save the trip.

I put them in a spare housing because I have no vice to put them in, plus I do not want to
damage the threads as I will still be using these in my engine.

These will be used for my coil mount.

 

What?! No vice? For shame!!!

 

so...you are using "sawed off" spark plugs to help make a coil mount??

 

IIRC advance auto has those lower bits of spark plugs in the odd ball part section. You know where the check valves, miscellaneous rubber pieces, T fittings for vacuum lines...