Duramax Diesels Forum Truck of the Week
  #16  
Old 11-06-2019, 10:36 AM
bimmer95 bimmer95 is offline
FNG
 
Join Date: Mar 2019
Location: Morgantown Pennsylvania
Posts: 12
Default

Quote:
Originally Posted by juddski88 View Post
From the pics you posted it certainly looks like there's some markings on 1 or more pistons in the wrist pin boss area. Which crank was used? Just curious. There seems to be room for multiple things wrong in this build.
Lb7 crank.im assuming the pistons were matched to weigh the same that's why there's material missing here an there..the rods as well.

Sent from my SAMSUNG-SM-G935A using Tapatalk
Reply With Quote
  #17  
Old 11-06-2019, 08:00 PM
juddski88's Avatar
juddski88 juddski88 is offline
Freedom Diesel
 
Join Date: Jul 2008
Location: Chesterfield, Mass.
Posts: 4,228

Default

Quote:
Originally Posted by bimmer95 View Post
Lb7 crank.im assuming the pistons were matched to weigh the same that's why there's material missing here an there..the rods as well.

Sent from my SAMSUNG-SM-G935A using Tapatalk
The marks I'm seeing don't appear man-made. Any marks on the counterweights? Next up is measuring the bore diameter from top to bottom, in 4 quadrants.
__________________
2001 Chevy 2500HD ECSB
"Sore Subject" - Still don't have time for it.
I would never have learned what I have without George Alexander, Mike Lovrich, David Browning, Matt Handwork, Ben Tyler, Evan Drosehn and countless members of this forum and others.
Thank you.

2014 Jeep Grand Cherokee Limited, Ecodiesel
Reply With Quote
  #18  
Old 11-07-2019, 11:21 AM
Fingers's Avatar
Fingers Fingers is offline
Village Idiot
 
Join Date: Apr 2008
Location: White Oak, PA
Posts: 1,634
Default

Check the other pistons in the area highlighted in the picture. I suspect that is the true crack origin.

Attached Images
File Type: jpg a67bbd1482197689c5bc93040567687e.jpg (12.1 KB, 152 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
  #19  
Old 11-09-2019, 10:58 AM
bimmer95 bimmer95 is offline
FNG
 
Join Date: Mar 2019
Location: Morgantown Pennsylvania
Posts: 12
Default

Quote:
Originally Posted by juddski88 View Post
The marks I'm seeing don't appear man-made. Any marks on the counterweights? Next up is measuring the bore diameter from top to bottom, in 4 quadrants.
Yea well I don't have the tools to measure the bore super accurately right now..mabe I'll get the machine guy to look at it..i can't find any abnormal marks on the crank..this is the counter weight next to the number 5 rod..not going to hit unless the rod is pretty majorly compressed an no marks..

Sent from my SAMSUNG-SM-G935A using Tapatalk
Reply With Quote
  #20  
Old 11-09-2019, 11:02 AM
bimmer95 bimmer95 is offline
FNG
 
Join Date: Mar 2019
Location: Morgantown Pennsylvania
Posts: 12
Default

Quote:
Originally Posted by Fingers View Post
Check the other pistons in the area highlighted in the picture. I suspect that is the true crack origin.



I checked all the rest an none of the others are cracked..but o well it won't happen again,I found a great deal on some r&r rod,diamond forged piston assemblys(I know it's overkill but hey u can't be too picky if u want a good bargain) so I'll be boring it 40 over and using those..

Sent from my SAMSUNG-SM-G935A using Tapatalk
Reply With Quote
  #21  
Old 11-09-2019, 01:19 PM
ZeroGravity58's Avatar
ZeroGravity58 ZeroGravity58 is offline
Hotrodder
 
Join Date: Mar 2008
Location: Maryland
Posts: 1,044

Default

Your going to DD a forged piston?
__________________
09 lmm ccsb ltz, moonshine, mpi s480 over 68mm vgt, sdp y bridge, BigDipper trans, 60 overs, 10mm pump, ppe up pipes and manifold, banks intercooler & exhaust, airdog165 w/sump, isspro guages, traction bars, the list goes on...Big thanks to BigDipper!
01 lb7 red RC/LB 11.58@119 MPH, SOLD
01 lb7 Black CC/LB, SOLD
Reply With Quote
  #22  
Old 11-09-2019, 07:43 PM
bimmer95 bimmer95 is offline
FNG
 
Join Date: Mar 2019
Location: Morgantown Pennsylvania
Posts: 12
Default

Yea

Sent from my SAMSUNG-SM-G935A using Tapatalk
Reply With Quote
  #23  
Old 11-10-2019, 05:42 AM
ZeroGravity58's Avatar
ZeroGravity58 ZeroGravity58 is offline
Hotrodder
 
Join Date: Mar 2008
Location: Maryland
Posts: 1,044

Default

Probably not the best idea. Might want to consider a set of the cast oval bowl pistions
__________________
09 lmm ccsb ltz, moonshine, mpi s480 over 68mm vgt, sdp y bridge, BigDipper trans, 60 overs, 10mm pump, ppe up pipes and manifold, banks intercooler & exhaust, airdog165 w/sump, isspro guages, traction bars, the list goes on...Big thanks to BigDipper!
01 lb7 red RC/LB 11.58@119 MPH, SOLD
01 lb7 Black CC/LB, SOLD
Reply With Quote
  #24  
Old 11-10-2019, 06:37 AM
TheBac's Avatar
TheBac TheBac is offline
Why do I keep doing this?


 
Join Date: Apr 2008
Location: Mid Michigan
Posts: 12,761

Default

He may be ok...will just have to be very careful on piston-to-wall clearance.
__________________
Tom
"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the DD
"Kleshay" -- 2000 C5 Corvette -- the toy

Marlene (Molly) Bacon -- 1936 - 2019 -- RIP Mom You're already missed, at home and on the piano.

Two wrongs dont make a right, but three rights do make a left.
Reality is a matter of perspective.
This forum isn't for the weak of heart.....or wallet.
"Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!" -- mufflerguy (yb)
Reply With Quote
  #25  
Old 11-10-2019, 01:15 PM
bimmer95 bimmer95 is offline
FNG
 
Join Date: Mar 2019
Location: Morgantown Pennsylvania
Posts: 12
Default

I'm not convinced that they're as bad as some people make them sound...diamonds have a steel ring land insert which helps some with ring wear..an .007 ptw clearance I think is what they recommend which isn't that bad.an a little racket when they're cold isn't bad to put up with...

Sent from my SAMSUNG-SM-G935A using Tapatalk
Reply With Quote
  #26  
Old 11-10-2019, 02:47 PM
Chevy1925's Avatar
Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
Join Date: Oct 2009
Location: Phoenix Az
Posts: 16,244

Default

Diamonds will be fine in his truck. Like he said, the steel ring lands they have makes the difference.
__________________
Quote:
Originally Posted by JoshH View Post
Mike L is my role model. I want to be like him when I grow up.
James

02 LB7, LLY, LBZ, LMM, LML, L5P 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
Reply With Quote
  #27  
Old 11-11-2019, 04:10 PM
S Phinney's Avatar
S Phinney S Phinney is offline
Hotrodder
 
Join Date: Aug 2008
Location: Quncy, Fl
Posts: 3,888

Default

Quote:
Originally Posted by bimmer95 View Post
I'm not convinced that they're as bad as some people make them sound...diamonds have a steel ring land insert which helps some with ring wear..an .007 ptw clearance I think is what they recommend which isn't that bad.an a little racket when they're cold isn't bad to put up with...

Sent from my SAMSUNG-SM-G935A using Tapatalk


Make sure you talk to a Diamond about those pistons before you spend any money. They said they have had some issues with those. Check first!


Sent from my iPhone using Tapatalk
__________________
03 GMC 4x4 CC/SB Intake, Dual Exhaust, built motor by Me, Cognito Kryptonite Suspension upgrades, Custom Traction Bars by Me, Suncoast Trans, 1055-1 Convertor, Two AirDog II 200's, Billet Sump, Venom Tuning AKA Me, Custom Fabbed Fuel system, Flexlite Fans, Best Time to date 7.14 at 98.21 mph 1211.8HP 1954.5 FT/Lb torque
2013 LML Daily Driver, 5" FloPro Exhaust, Venom Tuning, Ad 165 4G Lift Pump, Upcoming HSP Billet Bridge And Piping, Upcoming CP3 Conversion
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 04:50 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vB.Sponsors