[DML] Part of the problem? (Ignition discovery)

["cruznmd" <racuti1@xxxxxxxxxxxx>]

My super-whamo-dyne, new ignition components arrived today. Just to 
prep, I figured I'd break a few spark plugs loose and inspect them. 
Bill and some other folks recommended this.

What I found was quite strange to me. The plugs looked exactly as I'd 
expected, yellow-ish insulator with sooty, rich, black carbon on 
everything except the tip of the electrode from un-burned fuel caused 
by ignition mis-fire. They looked perfectly normal except the soot.

The exception? A perfect groove had been deeply burned into the 
electrode of every single plug. (Not the hook part, the "male" part) 
I know some plugs are "split-fire" with split electrodes but I did 
NOT buy those. The groove is very deep on some of the plugs, almost 
down to the insulator and not always cut -precisely- in the center.

Is this caused by an over-voltage condition at the ignition coil? I 
did foolishly purchase plugs 1 heat range higher than OEM. They are 
NGK TRW-5's.

I bought Bosch plugs of the proper heat range and quality wires this 
time. I also bought a new rotor and I'm glad. If the plugs look like 
that, I wonder what remains of the 5k Ohm resistor in the rotor.

If anyone needs me, I'll be writing 100 times on my kids' 
chalkboard: "I do not know more than automotive engineers".

Rich A.
#5335




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