pulled plug and there was no gap!!!
07-09-2016, 09:02 PM
#1
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pulled plug and there was no gap!!! car was running crappy so I pulled plugs and found them all black with carbon and oil really bad. 1 plug had no gap, and appeared to bent closed some how. I personally gapped these plugs last year and made sure it was done properly and check mutiple times before installing. if i recall it was at gapped 40 or 42. why would it be Bent , and am I correct on the gap? also , what could the oil be from? rings, valve seals, intake or bad pcv? BTW it's a heads/ cam car, heads are milled to 61cc .040 gasked so compression is higher. plugs are ngk tr7 ix. thanks
07-10-2016, 10:17 AM
#5
That was my factory ls1, with 15psi of boost, on a really cold January, with very tight rings that measured 0.011-0.014" upon teardown... not a good combination for that much power. Before any armchair qb's chime in, the tune was spot on, 13 degrees of timing, afr's were high 10s, low 11s, it was just too much power for a stock piston with tight rings.
07-10-2016, 06:00 PM
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07-11-2016, 10:27 AM
#10
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Too Much Fuel=Heat SURE, the #8 piston has "lost" it's crown.
I thought the question posted was concerned with finding a cause.
MY observation is directed to the #6 piston top showing those little "pit marks" close to the center of that piston.
AN OVER Rich mixture can do this type of damage, overheat a piston, expanding the top ring until it "butts".
Those here who use a Diesel Truck for towing know that over fueling WILL melt a piston.
Another observation would be to picture a "good" plug form #6.
Lance
I thought the question posted was concerned with finding a cause.
MY observation is directed to the #6 piston top showing those little "pit marks" close to the center of that piston.
AN OVER Rich mixture can do this type of damage, overheat a piston, expanding the top ring until it "butts".
Those here who use a Diesel Truck for towing know that over fueling WILL melt a piston.
Another observation would be to picture a "good" plug form #6.
Lance
07-11-2016, 01:54 PM
#12
SURE, the #8 piston has "lost" it's crown.
I thought the question posted was concerned with finding a cause.
MY observation is directed to the #6 piston top showing those little "pit marks" close to the center of that piston.
AN OVER Rich mixture can do this type of damage, overheat a piston, expanding the top ring until it "butts".
Those here who use a Diesel Truck for towing know that over fueling WILL melt a piston.
Another observation would be to picture a "good" plug form #6.
Lance
I thought the question posted was concerned with finding a cause.
MY observation is directed to the #6 piston top showing those little "pit marks" close to the center of that piston.
AN OVER Rich mixture can do this type of damage, overheat a piston, expanding the top ring until it "butts".
Those here who use a Diesel Truck for towing know that over fueling WILL melt a piston.
Another observation would be to picture a "good" plug form #6.
Lance
But back to the original post, I bet if the plug has the electrode gap closed, you had something hit it, which is not good.
