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View Poll Results: Please pick the one that you had break
LB7/LLY 01-05 57 34.97%
LBZ/LMM 06-10 90 55.21%
LML 11+ 16 9.82%
Voters: 163. You may not vote on this poll

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  #16  
Old 06-11-2010, 08:14 PM
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I think you're right. I found his carnage thread when I was searching "next weakest link" over there. God, was that an ugly mess. Wiped that motor out completely.


I ask about balancing because I was amazed at just how much weight the guys had to add to my crank to balance the LBZ rods to the LB7 crank, not to mention how much grinding they had to do to the rods to match them up. Just how far "off" is allowable with the OEM balance values, anyways?
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Last edited by TheBac; 06-11-2010 at 08:17 PM.
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  #17  
Old 06-12-2010, 06:52 AM
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Quote:
Originally Posted by TheBac View Post
heartbeatcanada was one of the first ones. Have to take the way-back machine to remember the year.

He was coming down to Indy nationals, that was 2005.
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  #18  
Old 06-12-2010, 07:40 AM
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crap and to think i tossed my last bottle of maalox (sp?) out....
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  #19  
Old 06-13-2010, 10:52 AM
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Quote:
Originally Posted by Noreaster View Post
He was coming down to Indy nationals, that was 2005.
That's right I remember that. I also met you there that year AJ. Along with a few other people from the DP.
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  #20  
Old 06-13-2010, 11:59 AM
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mine went from the lose of #2 main and split the main bearing webbing on mains 2 3 and 4
oem untouch
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Last edited by malibu795; 06-13-2010 at 11:59 AM.
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  #21  
Old 06-18-2010, 09:00 PM
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Well I bought a truck with a broken crank, and after studying it all out, it is our inclination to think that it is caused by rpm more than anything. And i know that the guy that i bought it from would often take it up to 5000 rpms these motors are externally balanced which means that the weight of the balancer slinging around on the end of the crank is causing it to fatigue and eventually break. It is my thinking that an internally balanced crank in going to be the key to stop these failures.
Lets hear some more on this what is everyone elses thoughts? Oh and mine is an LBZ
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  #22  
Old 06-18-2010, 10:41 PM
IdahoRob IdahoRob is offline
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Well, we about beat the crank out of the block, but haven't broke one yet. Started out as a well used LB7, built and ran a full year at 900-1200HP and re-built it this month. Same crank is back in the engine for another season, we'll see.
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  #23  
Old 06-18-2010, 11:53 PM
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Wow Rob that's insane! Did you do anything to the crank? Cryo?

Nick
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  #24  
Old 06-19-2010, 05:10 AM
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Quote:
Originally Posted by IdahoRob View Post
Well, we about beat the crank out of the block, but haven't broke one yet. Started out as a well used LB7, built and ran a full year at 900-1200HP and re-built it this month. Same crank is back in the engine for another season, we'll see.
That is wats so crazy some take way more than others. what sort of rpm were you turning out of that one?
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03 2500 Burb: LBZ swapped!

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  #25  
Old 06-22-2010, 07:58 AM
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Mine broke, I am checking now to see if it was balanced right or at all.
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Last edited by mvnvltn; 06-22-2010 at 08:06 AM.
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  #26  
Old 06-22-2010, 01:40 PM
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Quote:
Originally Posted by mvnvltn View Post
Mine broke, I am checking now to see if it was balanced right or at all.
Built or stock motor?
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  #27  
Old 07-20-2010, 05:26 PM
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bump for info.... did you ever get your stuff checked mvnvltn?
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  #28  
Old 07-20-2010, 06:13 PM
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I got a call from Ben tonight that his crank is probably broke.
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"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"Flyin' Brick" -- 1999 Chevy 1500 RC/SB 2wd -- stalled out, no motivation
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the fun little DD
"The Bigger Boat" -- 2011 Workhorse P700 - 6.0LS/Allison - what I drive at work


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)
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  #29  
Old 07-20-2010, 06:24 PM
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Ben?? as in Duratothemax.....???

What happened?
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  #30  
Old 07-20-2010, 06:26 PM
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i broke one to recently in my stock engine
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