uh...is it bad when this happens???
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From: Richmond, VA, USA
uh...is it bad when this happens???
hi guys, well I pretty much knew that I had hurt my plugs last week when I sprayed the truck at the track. it was detonating, but it was going so fast that I didn't want to lift.
going by the 1/8 mile time (7.27@94mph), I figure I would've run about an 11.30 or so in the quarter mile.
however, the truck lost power and I had to shut it down at half track, resulting in a 11.85 at a whopping 92mph.
anyway, here's the picture.
this is what happens when you know you should lift, but dont:
two IT-22s up in smoke. one melted the electrode off and destroyed the porcelain, the other just destroyed the porcelain starting at the bottom! the very tip of the porcelain is just jingling around on the center electrode like a little hoola hoop or something!
oh well, thank goodness it wasn't worse (a piston or ring) I swapped the old plugs out for some NGK BR7s tonight after work.
I hope to get the truck on the dyno tomorrow and try the nitrous again to find out what the problem is. I don't think it's a lean condition, and I kinda doubt it's too much timing, it may just be an octane issue, but I'll find out soon enough.
later,
chris
going by the 1/8 mile time (7.27@94mph), I figure I would've run about an 11.30 or so in the quarter mile.
however, the truck lost power and I had to shut it down at half track, resulting in a 11.85 at a whopping 92mph.
anyway, here's the picture.
this is what happens when you know you should lift, but dont:
two IT-22s up in smoke. one melted the electrode off and destroyed the porcelain, the other just destroyed the porcelain starting at the bottom! the very tip of the porcelain is just jingling around on the center electrode like a little hoola hoop or something!
oh well, thank goodness it wasn't worse (a piston or ring) I swapped the old plugs out for some NGK BR7s tonight after work.
I hope to get the truck on the dyno tomorrow and try the nitrous again to find out what the problem is. I don't think it's a lean condition, and I kinda doubt it's too much timing, it may just be an octane issue, but I'll find out soon enough.
later,
chris
Last edited by superfords; Apr 2, 2004 at 10:09 PM.
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From: Selden NY
Ahh thats Nothing Chris
What are BR7's gonna do that IT-22's dont ???
That would have happen with BR-7's too,
That problems in your fuel system or tune, "NOT THE PLUGS"
I KNOW you'll figure it out, TG thats all that happen
GOOD LUCK BRO
What are BR7's gonna do that IT-22's dont ???
That would have happen with BR-7's too,
That problems in your fuel system or tune, "NOT THE PLUGS"
I KNOW you'll figure it out, TG thats all that happen
GOOD LUCK BRO
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Hope you get it right Chris, and you will.. Sure happy for you it was not something more costly man......... I'm anxious to see that motor in one piece.............
PEacE................
Jim
PEacE................
Jim
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while I've never actually spent any time INSIDE a combustion chamber while an engine was running...
I don't think that it just breaks off in one piece.
think of a fuse blowing from too much current, the metal wire actually melts very quickly.
detonation is the uncontrolled burning of fuel in the combustion chamber. "uncontrolled" because the fuel is actually igniting BEFORE the spark is fired by the coil/distributor/plug etc. the fuel burns on its own because of the EXTREME TEMPERATURES created by boost, nitrous, compression, lean air fuel, etc. I'm guessing it must be what between 1000 and 2000 degrees in there? hot enough for the fuel to just EXPLODE on it's own. I'd say that's hot enough to melt that little tiny side electrode. maybe somebody with more knowledge in this area will chime in, because I'm certainly not an expert. and maybe I'm not 100% correct here.
but anyway, I believe that it melts or burns off. at least the electrode does.
the porcelain, I don't know.
either way, it would blow out the exhaust valve.
if there were any actual chunks, they are prolly stuck in the front of my catalytic converter right now!
BTW, I had a friend that worked as a mechanic in the army. he once told me about working on the HUMVEE diesel engines. he said that they often broke the glow plugs off in the head. frequently they couldn't be removed for some reason, so they just beat the crap out of them until the pieces fell down in the cylinder
then installed a new plug and fired it up and let the pieces blow out of the exhaust valve!
sounds crazy to me, especially on a diesel with such high compression, on many diesels the piston actually comes up out of the block into the combustion chamber a little. wouldn't leave much room for spare parts. but anyway, that's what he said they did.
later,
chris
I don't think that it just breaks off in one piece.
think of a fuse blowing from too much current, the metal wire actually melts very quickly.
detonation is the uncontrolled burning of fuel in the combustion chamber. "uncontrolled" because the fuel is actually igniting BEFORE the spark is fired by the coil/distributor/plug etc. the fuel burns on its own because of the EXTREME TEMPERATURES created by boost, nitrous, compression, lean air fuel, etc. I'm guessing it must be what between 1000 and 2000 degrees in there? hot enough for the fuel to just EXPLODE on it's own. I'd say that's hot enough to melt that little tiny side electrode. maybe somebody with more knowledge in this area will chime in, because I'm certainly not an expert. and maybe I'm not 100% correct here.
but anyway, I believe that it melts or burns off. at least the electrode does.
the porcelain, I don't know.
either way, it would blow out the exhaust valve.
if there were any actual chunks, they are prolly stuck in the front of my catalytic converter right now!
BTW, I had a friend that worked as a mechanic in the army. he once told me about working on the HUMVEE diesel engines. he said that they often broke the glow plugs off in the head. frequently they couldn't be removed for some reason, so they just beat the crap out of them until the pieces fell down in the cylinder
then installed a new plug and fired it up and let the pieces blow out of the exhaust valve!sounds crazy to me, especially on a diesel with such high compression, on many diesels the piston actually comes up out of the block into the combustion chamber a little. wouldn't leave much room for spare parts. but anyway, that's what he said they did.
later,
chris
Last edited by superfords; Apr 3, 2004 at 02:20 PM.
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From: La Habra, CA
The porcelin won't melt. Hopefully it found it's way out before it got under an exahust valve.
The BR7 is much colder and is not a projected gap plug, so it will have a tendency to live as little longer, It will not fix the detonation that broke the porcelin. That's a function of the timing and or air/fuel ratio.
Hope there was no damage.
The BR7 is much colder and is not a projected gap plug, so it will have a tendency to live as little longer, It will not fix the detonation that broke the porcelin. That's a function of the timing and or air/fuel ratio.
Hope there was no damage.