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GM Competition and Performance General GM Competiton and Performance |
07-21-2009, 07:36 PM
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#1
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Name: Devan Manis
Title: usually bitting my tongue
Status: Not Here
Join Date: Aug 2006
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Posts: 229
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where do all the duramax pistons crack?
In an effort to keep the dodge common rail piston melting thread on topic i have started this thread to ask a quick question. Where do all the duramax pistons crack? Is there a common area or are they pretty random?
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2000 Qclb, Drag comp, 150hp injectors, 62/71/14 gds turbo, AFE cold air, fire ringed head, studs, cam, ATS exhaust manifold, 4" exhaust, full billet trans with 5 star T.C. 13.11@101mph 550rwhp
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07-21-2009, 07:39 PM
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#2
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Name: paint94979
Title: Too Much Time
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Quote:
Originally Posted by Devan Manis
In an effort to keep the dodge common rail piston melting thread on topic i have started this thread to ask a quick question. Where do all the duramax pistons crack? Is there a common area or are they pretty random?
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the LBZ/LLM piston crack at the wrist pin
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07-21-2009, 07:43 PM
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#3
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Name: malibu795
Title: 2wd numb nut
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Quote:
Originally Posted by paint94979
the LBZ/LLM piston crack at the wrist pin
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same with LB7/LLY crack at the wrist pin running parrellel
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adam
99 3500HD LBZ/4l85 C&C semi retired hotshot
07 3500hd LMM RCLB hotshot, GT4088R, ovals
99 FL60 mutt
Quote:
smooth seas never made a skillfull sailor
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07-21-2009, 08:05 PM
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#4
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Name: Diesel Tech
Title: #1 Crusty Old Fart
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Most every cracked Duramax piston will have a hole, be it small or large from the oil cooling galley into the bowl at the beginning of the crack. The hole will be in line with the oil squirter fill hole or the exit hole from the underside of the piston. It will then follow along parallel to the wrist pin until it exits the edge of the piston.
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Tuners of quick and fast Duramax pickups.
"I would rather lose going fast enough to win than win going slow enough to lose."
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07-22-2009, 08:01 PM
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#5
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Name: Devan Manis
Title: usually bitting my tongue
Status: Not Here
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well thanks for the speedy answers, does any one have pictures?
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2000 Qclb, Drag comp, 150hp injectors, 62/71/14 gds turbo, AFE cold air, fire ringed head, studs, cam, ATS exhaust manifold, 4" exhaust, full billet trans with 5 star T.C. 13.11@101mph 550rwhp
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07-23-2009, 01:10 AM
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#6
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Name: Purehybrid
Title: Just Another Wrench
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thats from Gasout's rebuild
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2003 GMC Dmax/6spd. PPE standard, Nexus pyro/boost/fuel, FASS pumps, MBRP 5in, AFE intake, M/T ATZs on stockies
Wish list: Clutch, A3K, head studs, EFI Live
BROTHERHOOD OF HANDSHAKERS #118
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07-23-2009, 01:34 AM
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#7
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Name: BluegrassDiesel
Title: UK2K!
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Location: KENTUCKY
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Has the exact cause of what makes the pistons crack been determined?
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Josh Land
Bluegrass Diesel Performance
Lancaster, Ky
SHOP ONLINE @ http://WWW.SHOPBLUEGRASS.COM
97 DodgePPL Limited Pro Stock "The Crippler"
09 3500 GMC CCDually
05 Silverado SS
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07-23-2009, 06:18 AM
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#8
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Name: bsmith
Title: Never enough
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Quote:
Originally Posted by teddybear
Has the exact cause of what makes the pistons crack been determined?
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Not enough material in that area, is what i was told.
__________________
RIP DEX
2001 2500 2wd
Diesel pro's cam
Walbro 392
Goff diesel injection
160hp pump
6x.013's by Weston
HTT 62/71/13 over FI 82/92/1.10
Levi's turbo blankets!
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07-23-2009, 07:18 AM
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#9
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Name: JustinD
Title: Broken LB7
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Less common to see LB7 pistons crack right? Thats why they use them in the LBZ/LMM rebuilds.
__________________
2001 Chevy 2500HD Duramax
4" MBRP turbo back exhaust
Industrial Injection Silver Bullet
Cheap CAI
Kennedy dual lift pumps
Kennedy Billet pick up
SCIV 1056
Pro Comp traction bars
EFI Live tuned by Jeff Toman
Stock charger12.65 @ 105 6898lbs
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07-23-2009, 10:05 AM
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#10
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Name: paint94979
Title: Too Much Time
Status: Not Here
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Quote:
Originally Posted by JustinD
Less common to see LB7 pistons crack right? Thats why they use them in the LBZ/LMM rebuilds.
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LB7 and LLY pistons are the same... the LBZ/LMM pistons are an asian brand piston as opposed to Mahle Pistons like on the LB7/LLY
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07-25-2009, 11:35 AM
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#11
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Name: Devan Manis
Title: usually bitting my tongue
Status: Not Here
Join Date: Aug 2006
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Posts: 229
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So the spray pattern on the picture kind of missed the bowl...
__________________
2000 Qclb, Drag comp, 150hp injectors, 62/71/14 gds turbo, AFE cold air, fire ringed head, studs, cam, ATS exhaust manifold, 4" exhaust, full billet trans with 5 star T.C. 13.11@101mph 550rwhp
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07-25-2009, 12:06 PM
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#12
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Name: malibu795
Title: 2wd numb nut
Status: Not Here
Join Date: Mar 2007
Location: s. charelston ohio
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Posts: 6,731
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Quote:
Originally Posted by bsmith
Not enough material in that area, is what i was told.
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some were there is a profile view of the LB7 piston on diesel place baried int he archives.. see if i can find it.
the cone is 158* stock has that flower pattern ...
the lip is more for emission than anything.. and it necks down to 1/8 radius. which heats up faster then the rest of the piston and it si the farthest away formn the oil coolling passage under the crown. it usually goes first and the rest follows mush like punch a hole in steal with a blow tourch.
__________________
adam
99 3500HD LBZ/4l85 C&C semi retired hotshot
07 3500hd LMM RCLB hotshot, GT4088R, ovals
99 FL60 mutt
Quote:
smooth seas never made a skillfull sailor
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07-25-2009, 12:24 PM
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#13
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Name: malibu795
Title: 2wd numb nut
Status: Not Here
Join Date: Mar 2007
Location: s. charelston ohio
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Posts: 6,731
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got some cut aways for you to look at.. these are from late 06 when we start loosing pistons
__________________
adam
99 3500HD LBZ/4l85 C&C semi retired hotshot
07 3500hd LMM RCLB hotshot, GT4088R, ovals
99 FL60 mutt
Quote:
smooth seas never made a skillfull sailor
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07-26-2009, 07:46 AM
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#14
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Name: bsmith
Title: Never enough
Status: Not Here
Join Date: Jul 2008
Location: la
Member`s Gallery
Posts: 3,966
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Quote:
Originally Posted by malibu795
some were there is a profile view of the LB7 piston on diesel place baried int he archives.. see if i can find it.
the cone is 158* stock has that flower pattern ...
the lip is more for emission than anything.. and it necks down to 1/8 radius. which heats up faster then the rest of the piston and it si the farthest away formn the oil coolling passage under the crown. it usually goes first and the rest follows mush like punch a hole in steal with a blow tourch.
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Thanks.
My buddy's lbz pistons looked like roasted marshmallows, kinda like some of the CRs.
__________________
RIP DEX
2001 2500 2wd
Diesel pro's cam
Walbro 392
Goff diesel injection
160hp pump
6x.013's by Weston
HTT 62/71/13 over FI 82/92/1.10
Levi's turbo blankets!
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