Piston Discussion

Duratys · 11-08-2006, 09:08 PM

So does that mean the LBZ pistons arent the weapon of choice?

Admin Edit: I've moved this post along with the rest of the technical discussion about pistons from this thread about the failure of the engine in Nasty Girl to this new thread. It contains some good technical discussion about Duramax pistons and shouldn't be in off topic. -sp33d

Trippin · 11-08-2006, 09:17 PM

I'm starting to hear about more and more cracked LBZ pistons.

Dieselson · 11-08-2006, 09:30 PM

Would forged pistons work?

malibu795 · 11-08-2006, 09:52 PM

i thought forged pistons were standard in diesel

are the a poor version of them or what????

DieselPro · 11-08-2006, 09:59 PM

Didn't they shave the tops a little to get even lower compression? Hmmmm? Or am I wrong about that. Know they use LBZ pistons if I am correct.

Diesel Tech · 11-08-2006, 10:02 PM

Diesel Power has been running LBZ pistons longer than most at high power without issue. He drives it everyday and races/pulls with it on the weekend. If the pistons were at issue here I feel he would have found it long before anyone else. If it's cracked there is an under lieing reason that needs to be found. Most diesel pistons are cast. They have a steel insert in the piston for the rings that needs to be in place for long life so that presents a problem with forged pistons. Pistons just do not crack something has caused it, that is what needs to be found. Who has crack an LBZ piston? If you have did you figure out why?

DieselPro · 11-08-2006, 10:11 PM

GM 6.5L Turbo pistons have no steel insert. They are hard anodized on top and in the ring area.

Trippin · 11-08-2006, 10:13 PM

This cracking issue was related to me by the Mahle representative at the AAPEX show.

He indicated the LBZ pistons in racing applications were cracking and that Mahle was getting ready to release a performance line of pistons.

Unfortunately, the Dodge line will be first to be released.

Followed by either Ford or Duramax, he was undecided as to which one would be next.

Diesel Tech · 11-08-2006, 10:39 PM

Mahle at the SEMA show had there Duramax piston on display and they have been shipping them already. It is based off there LB7 casting as they were the OEM supplier for those. They are however working on a racing piston as we have been involved with them on it from the start but it's not completed yet. As far as cracked LBZ pistons I haven't heard or seen any but as I stated before there is a reason why it's crack and it needs to be found.

GMCSLEHD · 11-08-2006, 11:22 PM

Would the combustion explosion, too early in the upstroke of the piston, after the piston had been heated by an overly long injection duration cycle cause this

Josh

11-08-2006, 09:08 PM	#1
Duratys Diesel Master Join Date: Nov 2004 Location: Alberta Posts: 2,188 Garage: active iTrader: (0)	So does that mean the LBZ pistons arent the weapon of choice? Admin Edit: I've moved this post along with the rest of the technical discussion about pistons from this thread about the failure of the engine in Nasty Girl to this new thread. It contains some good technical discussion about Duramax pistons and shouldn't be in off topic. -sp33d __________________ 04 SIERRA CC SB 4x4
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11-08-2006, 09:17 PM	#2
Trippin SoCal Diesel / Click for Info! Supporting Vendor Join Date: Oct 2003 Location: Valencia, CA Posts: 5,540 Garage: active iTrader: (0)	I'm starting to hear about more and more cracked LBZ pistons. __________________ SoCal Diesel CNC Ported Dmax Heads (661) 775-5620 How Big Is Your Duramax? 7.1 Liter Kits Here! Competition Engines Built to Your Power Requirements Dmax Piston Bowl Reconfiguration-Machining and Thermal Barrier Coating Duramax Camshafts Designed by SoCal Diesel Crower Rods In StockCarrillo RodsIn StockHowards/DPR Rods In Stock EFILive V2 Commercial $799 Includes Free 75 HP Tow tune Mahle Forged Duramax Piston Kits Available Here
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11-08-2006, 09:30 PM	#3
Dieselson Diesel Fanatic Join Date: Sep 2006 Location: Closta Mexico, CA Posts: 1,292 Garage: active iTrader: (0)	Would forged pistons work? __________________ 01' Chevy 2500HD CC/SB D/A Garrett GT40R Turbo , PPE Hot +2 Et., 02' PCM, Duramaximizer, Suncoast IV by PPE, ATS Five Star Converter, Fabtech Tie Rods, Idler arm and pitman arm(I doubt its fabtech) PPE Dual Fueler! Straight Pipe, 2CP3 Tuning, SX Performance Lift Pump New: Lift Kit Removed! 12 Second Work Truck! PPE, Pacific Performance Engineering (714)985-4825 618 RWHP & 1254 RWT as of 3/1/07 #2 Only & 12.75@107.44 Dad's Truck Special Thanks to Joe Komaromi and Dan Grant from PPE DP's youngest active member and Proud of it! Member #1 of DP Under 16 Club Member #1001 DHRA Founder and Former #1 Member of socal black smoke
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11-08-2006, 09:59 PM	#5
DieselPro Diesel Master Join Date: Mar 2004 Posts: 3,240 Garage: active iTrader: (0)	Didn't they shave the tops a little to get even lower compression? Hmmmm? Or am I wrong about that. Know they use LBZ pistons if I am correct. __________________ Over Fueling the mind with innovation.
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11-08-2006, 10:02 PM	#6
Diesel Tech Diesel Master Join Date: Sep 2003 Location: USA Posts: 4,063 iTrader: (0)	Diesel Power has been running LBZ pistons longer than most at high power without issue. He drives it everyday and races/pulls with it on the weekend. If the pistons were at issue here I feel he would have found it long before anyone else. If it's cracked there is an under lieing reason that needs to be found. Most diesel pistons are cast. They have a steel insert in the piston for the rings that needs to be in place for long life so that presents a problem with forged pistons. Pistons just do not crack something has caused it, that is what needs to be found. Who has crack an LBZ piston? If you have did you figure out why? __________________ 2004.5 LLY SC 2wd 2006 LBZ CC 4wd both with a few TTS Power Systems go fast pieces
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11-08-2006, 10:11 PM	#7
DieselPro Diesel Master Join Date: Mar 2004 Posts: 3,240 Garage: active iTrader: (0)	GM 6.5L Turbo pistons have no steel insert. They are hard anodized on top and in the ring area. __________________ Over Fueling the mind with innovation.
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11-08-2006, 10:13 PM	#8
Trippin SoCal Diesel / Click for Info! Supporting Vendor Join Date: Oct 2003 Location: Valencia, CA Posts: 5,540 Garage: active iTrader: (0)	This cracking issue was related to me by the Mahle representative at the AAPEX show. He indicated the LBZ pistons in racing applications were cracking and that Mahle was getting ready to release a performance line of pistons. Unfortunately, the Dodge line will be first to be released. Followed by either Ford or Duramax, he was undecided as to which one would be next. __________________ SoCal Diesel CNC Ported Dmax Heads (661) 775-5620 How Big Is Your Duramax? 7.1 Liter Kits Here! Competition Engines Built to Your Power Requirements Dmax Piston Bowl Reconfiguration-Machining and Thermal Barrier Coating Duramax Camshafts Designed by SoCal Diesel Crower Rods In StockCarrillo RodsIn StockHowards/DPR Rods In Stock EFILive V2 Commercial $799 Includes Free 75 HP Tow tune Mahle Forged Duramax Piston Kits Available Here
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11-08-2006, 10:39 PM	#9
Diesel Tech Diesel Master Join Date: Sep 2003 Location: USA Posts: 4,063 iTrader: (0)	Mahle at the SEMA show had there Duramax piston on display and they have been shipping them already. It is based off there LB7 casting as they were the OEM supplier for those. They are however working on a racing piston as we have been involved with them on it from the start but it's not completed yet. As far as cracked LBZ pistons I haven't heard or seen any but as I stated before there is a reason why it's crack and it needs to be found. __________________ 2004.5 LLY SC 2wd 2006 LBZ CC 4wd both with a few TTS Power Systems go fast pieces
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11-08-2006, 11:22 PM	#10
GMCSLEHD Diesel Fanatic Join Date: Sep 2003 Location: Colorado Posts: 379 iTrader: (0)	Would the combustion explosion, too early in the upstroke of the piston, after the piston had been heated by an overly long injection duration cycle cause this Josh __________________ www. superdieselperformance .com www. dynadroitclutches .com 04 GMC2500HD,4x4,SLT,CC,SB,(LB7) Runnin' on 60% B20 & 40% Hydraulic Oil (for 12k miles and counting) [A little harder to start if it's under 40]
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