So I was taking the rings off my hurt #7 piston...
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Back in november, I thought the car was kinda sluggish. Only ran 10.7x in real good air...so I thought a tear down was in order.
Found a cracked ringland
![](http://home.comcast.net/~tfranklin5580/piston.jpg)
In all reality that didn't look too bad. But today, I decided to get a look at the back side of the rings (in the ring lands) and the piston did this![Icon Eek](https://ls1tech.com/forums/images/smilies2/icon_eek.gif)
![](http://home.comcast.net/~tfranklin5580/piston2.jpg)
I definately ran 10.70 on 7 cylinders
Thought that was pretty interesting...Nothing like blowing out ringlands on a N/A car
Found a cracked ringland
![](http://home.comcast.net/~tfranklin5580/piston.jpg)
In all reality that didn't look too bad. But today, I decided to get a look at the back side of the rings (in the ring lands) and the piston did this
![Icon Eek](https://ls1tech.com/forums/images/smilies2/icon_eek.gif)
![](http://home.comcast.net/~tfranklin5580/piston2.jpg)
I definately ran 10.70 on 7 cylinders
![Hail](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_hail.gif)
Thought that was pretty interesting...Nothing like blowing out ringlands on a N/A car
![Mr. Cool](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cool.gif)
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Originally Posted by My90Iroc
Wow, that's scary. What exactly is your setup and how high were you spinning it?
RPM didn't do it...it was stupidity. The time before I ran on 93 octane in
-2000 ft air with .040 milled 5.3L heads... a bit too much for pump gas
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
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Originally Posted by SideStep
YOUSER!!! Where there any "signs" before you tore it down that would have pointed to this???
Good Luck,
![Lurk](https://ls1tech.com/forums/images/smilies3/lurk.gif)
Good Luck,
![Lurk](https://ls1tech.com/forums/images/smilies3/lurk.gif)
big sign was the rear grommet on the driver side valvecover blew out from the crankcase pressure...at the time I didn't equate it to that...
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Originally Posted by Fireball
RPM didn't do it...it was stupidity. The time before I ran on 93 octane in
-2000 ft air with .040 milled 5.3L heads... a bit too much for pump gas![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
-2000 ft air with .040 milled 5.3L heads... a bit too much for pump gas
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
Can you send me the specs on the Trex cam from the cam card so I can compare DCR against the cam I'm planning? Thanks.
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I was having the same symptoms, sluggish and a few tenths off. I found scratches on #7 cylinder last night. The engine is coming out this week and I suspect the same has happened to me. This had been an FI engine and had encountered some detonation.
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Originally Posted by orangeapeel
So those were the stock rods and pistons?
![Winky](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_wink.gif)
I wasn't running stock rings though. I had diamond pro selects at .018/.022