Accelerated onto expressway then extreme misfiring...
Evolving Member
Joined: Feb 2009
Posts: 121
Likes: 1
From: Fort Lauderdale, FL
I didn't drop any of the plugs. I saw the lack of gap immediately when I pulled it out of the cylinder. It was gapped from the factory. Pretty sure these are factory plugs unless AMS swapped them with the tune. That is possible I suppose. Either way something happened that caused this. Yeah the drop in may have changed the boost a bit. Its possible.
well that lack of gap will surely give you ignition issues, just look at how black that plug is and you can tell it's running pig rich in that cylinder. I'd get a new set of plugs gapped to the factory spec and see what that does.
I really don't think its possible to close a plug gap with detonation... In fact, I'll dare to say its impossible...
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
I really don't think its possible to close a plug gap with detonation... In fact, I'll dare to say its impossible...
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
I agree that det won't close a gap up like that, when my piston let go, the electrode was kicked to the side and pushed towards the threads.
Sucks for the OP, but it's more likely to be debris in the chamber.
I really don't think its possible to close a plug gap with detonation... In fact, I'll dare to say its impossible...
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
However, typically when you see ground straps smashed into electrodes, it means that there is a foreign object in the cylinder! This is not a good thing obviously. I have only seen this happen a couple of times. Sometimes you get lucky and the object moves through the cylinder and doesn't do any real big damage. I have also see the opposite where it totally destroys the piston and the head!
Since the car still runs, the damage can't be that bad. Sounds like he is coming in so we can just stick the bore-o-scope in it and see whats up!
The ring ends collide and take a piece of the piston with it.
The piston schrapnel works its way through the turbine blades degrading the turbo on its way out.
One of your pistons is likely damaged at the least, the turbine blades are likely chewed up and your cylinder compression in the damaged cylinder or cylinders will continue to degrade over time before you will need to rebuild the engine.
To Chris's defense, probably is NOT detonation related, however increasing the performance of the engine can lead to this top ring failure.
Last edited by TTP Engineering; May 11, 2009 at 02:29 PM.
Mine still ran with about 1/3 of the top of a piston cracked off
I agree that det won't close a gap up like that, when my piston let go, the electrode was kicked to the side and pushed towards the threads.
Sucks for the OP, but it's more likely to be debris in the chamber.
I agree that det won't close a gap up like that, when my piston let go, the electrode was kicked to the side and pushed towards the threads.
Sucks for the OP, but it's more likely to be debris in the chamber.
We have seen this many times already.
Maybe I'm just 'too conservative' of a tuner to ever have noticed this phenomenon.
TTP: Your concern has been noted in a couple of threads now. I will be sure to let you know if we ever have a single problem relating to this.
I have done this to a civic I own and to a beetle but the beetle motor died at that time. On the civic I had gotten bad gas and the water for somereason did not want to compress as well as fuel. I do see it on gm 3.8 motors about once every 6 months from hydrolocking caused by bad intakes which is not the problem here. I would have to go with there is really no good guess untill the boroscope checks it. If all good there I would ponder if it was possible that the injector stuck open and flooded the cylinder or bad gas.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
I've read lots of stories of head lift, bent rods, and destroyed main bearings, but this is the first time of heard of a ground strap getting hammered by the pressure spike of a detonation event. Will be interesting to see if a piece of the guy's piston is missing.
Once again the turbine blades are chewed up and out of balance.
Hey at least the turbo got a free clipping to increase exhaust flow.
This will be another core for an FPRed for Evo X as they replace the turbine shaft with the larger one anyway in the build.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
https://www.evolutionm.net/forums/ev...k-block-4.html
https://www.evolutionm.net/forums/7027740-post50.html
https://www.evolutionm.net/forums/7028639-post56.html
https://www.evolutionm.net/forums/7027740-post50.html
https://www.evolutionm.net/forums/7028639-post56.html
Last edited by TTP Engineering; May 11, 2009 at 05:26 PM.