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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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  #1  
Old 05-13-2010, 06:26 PM
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Default Broken Crankshaft Count?

Just out of curiosity how many have broken there cranks at the #2 Rod Journal?

I know of many but people never seem to post up there failures so time and time again no matter the build etc..... we here about it but yet never seem to see people post about it on forums?
Why is this?

Not looking to start a bash thread or my engine builder has zero failures or this engine builder has all kinds of failures just looking to see an actual count of failures if possible.
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  #2  
Old 05-13-2010, 06:35 PM
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I have had one breakage and it was on my stock engine.
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  #3  
Old 05-13-2010, 06:41 PM
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This is where mine broke. Build consisted of tts rods, 20 over injectors, 20 over delipped pistons, headstuds, mainstuds, dual cp3, and 66mm turbo. stock balancer I had been pulling a trailer earlier in the day but was only going around 35 when it finally broke.
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Old 05-13-2010, 07:16 PM
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I have personally seen 3 broken ones from 500hp to 850hp with no rhyme or reason to it. It has been troubling me and I have been trying to figure out why this is randomly happening. I had a thought about it being an issue with the firing order causing a harmonics issue and now I see that you guys have a new billet camshaft that has a different firing order... Looks like I am not the only one thinking about this theory. Good food for thought, but how do you prove it?
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Old 05-14-2010, 03:41 AM
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I had one break. We talked with you about it for a bit at TS.
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  #6  
Old 05-14-2010, 03:52 AM
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mine brokeded
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Old 05-14-2010, 04:44 AM
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Is this mainly on LB7's???
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Old 05-14-2010, 08:38 AM
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we have seen all kinds of builds, makes, years, etc. Both stroked and stock cranks. First sign is main bearing copper in the oil and then shortly there after broken or strongly flexed crank failure.
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Old 06-08-2010, 06:18 PM
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Default broken cranks

i have three i know of in my area , is there anyway it could be casting flaws????
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Old 06-08-2010, 06:25 PM
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I know MR.Yfz450 broke a crank I don't know if he is a member here his was a LBZ
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  #11  
Old 06-10-2010, 02:41 PM
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I broke one too on my LB7. For this build I just dropped my spare crank off to get magnafluxed and then it's off to get cryoed. Hope it helps.
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Last edited by duramaxdiesel; 06-10-2010 at 02:42 PM.
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Old 06-11-2010, 04:29 PM
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That's it?? No one else? I believe this is more widespread than we know.
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Old 06-11-2010, 05:54 PM
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Quote:
Originally Posted by duramaxdiesel View Post
That's it?? No one else? I believe this is more widespread than we know.
Theres more failures that don't get posted rather than get posted to protect companies reputation.

Or you can be a real asshole like Nick D'Amico & blame an engine failure on another part on the motor rather than say it was a part from his tuning buddy that actually caused it.
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Old 06-11-2010, 07:29 PM
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Im curious how many of these broken cranks were balanced beforehand, or if they were untouched OEM.


heartbeatcanada was one of the first ones. Have to take the way-back machine to remember the year.
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Old 06-11-2010, 08:09 PM
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Quote:
Originally Posted by TheBac View Post
Im curious how many of these broken cranks were balanced beforehand, or if they were untouched OEM.


heartbeatcanada was one of the first ones. Have to take the way-back machine to remember the year.
yep! I think that was mid/late 05. Oddly he started to split the block main bearing webbing too if I remember correctly...?

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