Duramax Diesels Forum Truck of the Week
  #31  
Old 07-08-2015, 10:02 PM
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Interesting. Sub'd for more info


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  #32  
Old 07-09-2015, 04:06 AM
jlawles2 jlawles2 is offline
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Just a thought, but is it possible to apply enough force to the top ring land in the axial travel direction to create that type of crack?

Almost looks like it either had too much timing in it and it caught the piston on the compression stroke, or too late of timing and it tried to drive the piston out the bottom of the bore.
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Silver Birch Metallic 2004.5 GMC K2500HD with 265/75's
Banks super scoop, tubing, intercooler, and cat back with the IQ on the Window (for now). BD driver side Exhaust manifold.
Airdog 150 on frame rail. Amsoil synthetics for lubrication, and dual Amsoil filters on the driver frame rail. PPE centrifuge install.
EGR blocked. PCV rerouted. Resonator blocked (reinstalled for looks). Bladerunner installed. Dead kitty by MBRP (front pipe) and down tube replaced with the MBRP (heat wrapped from the turbo down to the front pipe).
Performax Gauges by ISSPRO in pod over mirror and overhead console (console pod by PPE). Mike L Transmission.
----Looking to do an onboard air with a set of truck air horns. Want Nathan K5LA's but not in the budget at the moment.----

06 GMC CCSB 2WD LBZ SLT package. Traded for '17 Denali

17 Denali CCSB 2500 4WD Stone Blue with Cocoa/Dark Sand Interior
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  #33  
Old 07-09-2015, 06:29 AM
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It's possible, but the amount of pressure to break the ring land would be more than enough to kill the crown.

In addition, the ring lands sees only a portion of the pressures that the crown sees.

IF I have time today I am going to use Die Penetrant on the other piston and see if there is a starter crack in any of those.

Discussion with some other knowledgeable people has been enlightening, but so far, nothing conclusive. I am personally focusing on either a defect or some sort of thermal stress.
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'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

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  #34  
Old 07-09-2015, 08:40 AM
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Dye penetrant

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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #35  
Old 07-09-2015, 09:29 AM
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Is there supposed to be a picture there?
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  #36  
Old 07-09-2015, 10:27 AM
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looks like just a verbiage correction
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  #37  
Old 07-09-2015, 11:16 AM
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  #38  
Old 07-12-2015, 09:04 PM
jlawles2 jlawles2 is offline
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The first picture did not show up this time, but something came to mind.

How much force would it take and what type of failure would it be if the crank stopped suddenly and the piston tried to continue moving upward?
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Silver Birch Metallic 2004.5 GMC K2500HD with 265/75's
Banks super scoop, tubing, intercooler, and cat back with the IQ on the Window (for now). BD driver side Exhaust manifold.
Airdog 150 on frame rail. Amsoil synthetics for lubrication, and dual Amsoil filters on the driver frame rail. PPE centrifuge install.
EGR blocked. PCV rerouted. Resonator blocked (reinstalled for looks). Bladerunner installed. Dead kitty by MBRP (front pipe) and down tube replaced with the MBRP (heat wrapped from the turbo down to the front pipe).
Performax Gauges by ISSPRO in pod over mirror and overhead console (console pod by PPE). Mike L Transmission.
----Looking to do an onboard air with a set of truck air horns. Want Nathan K5LA's but not in the budget at the moment.----

06 GMC CCSB 2WD LBZ SLT package. Traded for '17 Denali

17 Denali CCSB 2500 4WD Stone Blue with Cocoa/Dark Sand Interior
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  #39  
Old 07-12-2015, 09:11 PM
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A lot. What would stop the crank dead in its tracks?


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  #40  
Old 07-12-2015, 10:11 PM
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Depends on how suddenly, the crank position, RPM, and the mass of the piston.
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But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
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  #41  
Old 07-13-2015, 04:13 AM
jlawles2 jlawles2 is offline
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Did not know if you figured out what caused the failure. Just a strange thought as to what could cause a failure like that.

Looking at the way the piston is cracked, was thinking that it could be failure due to high rpm cut out. Position of the crank would be about mid stroke(should be the fastest the piston will be traveling).

Aluminum fatigue or just outright failure? Like you stated, its not in an area where you would suspect failure.
__________________
Silver Birch Metallic 2004.5 GMC K2500HD with 265/75's
Banks super scoop, tubing, intercooler, and cat back with the IQ on the Window (for now). BD driver side Exhaust manifold.
Airdog 150 on frame rail. Amsoil synthetics for lubrication, and dual Amsoil filters on the driver frame rail. PPE centrifuge install.
EGR blocked. PCV rerouted. Resonator blocked (reinstalled for looks). Bladerunner installed. Dead kitty by MBRP (front pipe) and down tube replaced with the MBRP (heat wrapped from the turbo down to the front pipe).
Performax Gauges by ISSPRO in pod over mirror and overhead console (console pod by PPE). Mike L Transmission.
----Looking to do an onboard air with a set of truck air horns. Want Nathan K5LA's but not in the budget at the moment.----

06 GMC CCSB 2WD LBZ SLT package. Traded for '17 Denali

17 Denali CCSB 2500 4WD Stone Blue with Cocoa/Dark Sand Interior
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  #42  
Old 07-21-2015, 08:17 PM
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Small update:

The failure appears to have originated in the oil gallery. This is based on the "aging" of the broken part at the oil gallery. Although the crack propagated to the ring insert, the crack there was "new" and not the starting point. The crack in the oil gallery extends for a ways around the piston beyond the part that broke free. The crack that continues is highlighted in the attached picture as well as the initiating point. These extended oil gallery cracks taper off going to the left in the picture and do not make it all the way to the ring insert.

It is not clear if it was induced by stress or was some sort of casting flaw. The gallery crack appears to have been three legged. One vertical leg and two horizontal meeting within the left highlighted area in the picture.
Attached Images
File Type: jpg Detail 1.jpg (74.0 KB, 167 views)
File Type: jpg Detail 2.jpg (103.7 KB, 166 views)
__________________
But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
Reply With Quote
  #43  
Old 08-25-2015, 08:14 PM
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Received this picture of a FORGED piston.



I am told all eight look about the same. I hope to have them in hand soon. My initial thought is that this is a similar failure as the previous. I'll know more when I see the piston(s).
Attached Images
File Type: jpg 11949536_10100370169809299_1879957354_n.jpg (135.3 KB, 290 views)
__________________
But.....What do I know.

'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

Dynoed 690 HP / 1200 TQ
Reply With Quote
  #44  
Old 08-25-2015, 09:05 PM
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That's interesting. Details on the motor?

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2003 CCSB LT LB7 deleted

Some cool stuff, some fast stuff, some slow stuff
EFI by Kory

Special thanks to Evan@Limitless
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  #45  
Old 08-25-2015, 09:09 PM
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Do this will be the Second know time of a failure in your pistons? Could it have simply been a bad batch of castings and forged blanks?
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