Piston Carnage - Pics Inside
05-01-2008, 11:50 AM
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Piston Carnage - Pics Inside I've been having a lot of blowby lately, and it has been increasing in magnitude for a few months now. I started to notice it a few thousand miles into my last turbo install. I knew I had some major problems, but just tried to convince myself it was worn rings.
I thought that things would be ok if I went back to NA and stock. Not the case! I was blowing quarts of oil out of the PCV and smoking like a freight train. I looked like James Bond spraying a smoke screen behind me.
I did a compression check and found that #1 and #3 were down in the 60-90s. #2 was around 160 or so. I stopped there and decided the engine was going to need a rebuild very soon!
Yesterday the car started missing and back firing, so I decided to tear it down. I found that #1, #3, #5 and #7 pistons all have serious ring land damage. The other bank is fine and none of the pistons are damaged.
Anyway, here are the pics! I just bought some new (used) pistons from a member and I'm going to hone and re-ring and cross my fingers for the next few thousand miles while I decide to either sell or build a new 6.0. I'm doing all of this while the engine is still in the car. It's not as hard as everone thinks it is. I dropped the K-member and had the engine torn down in a few hours. Everything is easy to get to once the K-member is out of the way. I'll just have to cover the crank while I hone.
I thought that things would be ok if I went back to NA and stock. Not the case! I was blowing quarts of oil out of the PCV and smoking like a freight train. I looked like James Bond spraying a smoke screen behind me.
I did a compression check and found that #1 and #3 were down in the 60-90s. #2 was around 160 or so. I stopped there and decided the engine was going to need a rebuild very soon!
Yesterday the car started missing and back firing, so I decided to tear it down. I found that #1, #3, #5 and #7 pistons all have serious ring land damage. The other bank is fine and none of the pistons are damaged.
Anyway, here are the pics! I just bought some new (used) pistons from a member and I'm going to hone and re-ring and cross my fingers for the next few thousand miles while I decide to either sell or build a new 6.0. I'm doing all of this while the engine is still in the car. It's not as hard as everone thinks it is. I dropped the K-member and had the engine torn down in a few hours. Everything is easy to get to once the K-member is out of the way. I'll just have to cover the crank while I hone.
05-01-2008, 02:00 PM
#5
When playing with turbos or forced induction you need tuning tools and monitoring devices a plenty. What you have there looks detonation induced. Could have also been too tight on the ring gap and they butted but it would more than likely pulled the top of the piston off.
05-01-2008, 02:06 PM
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You are correct.
I have HPTuners and a wideband. I was running 42# injectors and logged 11.5 to 11.7 AFR at WOT. No knock was ever logged during tuning or logging runs. Something went wrong somewhere, even with a safe AFR and no knock.
It's strange that only one side was affected. I logged AFR at the downpipe, so bank 2 could have been really rich while bank 1 was lean. Maybe something with one knock sensor? I'm not sure, but from know on I'm going forged for FI with widebands on both banks.
I have HPTuners and a wideband. I was running 42# injectors and logged 11.5 to 11.7 AFR at WOT. No knock was ever logged during tuning or logging runs. Something went wrong somewhere, even with a safe AFR and no knock.
It's strange that only one side was affected. I logged AFR at the downpipe, so bank 2 could have been really rich while bank 1 was lean. Maybe something with one knock sensor? I'm not sure, but from know on I'm going forged for FI with widebands on both banks.
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05-01-2008, 02:23 PM
#9
If you use any kind of force induction or nitrous make shore you file your ring for that applaction. The heat it can cause on stock ring gaps can cause the rings to binde and cause drag on the rings and brake rings and ring landings . You need forge pistons for shore
Last edited by Randy WS6; 05-01-2008 at 04:44 PM.
bad luck i guess
05-01-2008, 08:03 PM
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That sucks. I've heard that the stock pistons are the weak point in the ls motors. Does this happen to them N/A sometimes or does it take some sort of FI to do it?
