I think it would be. Just do a new crank and af cam.
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Broken Crankshaft Count?
- Thread starter EDP
- Start date
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Most likely it would be, but stock trucks break cranks too. It's the luck of the draw. The Callie's setup will be geared more towards the street applications.
I talked to a guy the other day that has worked on a lot of them and he said every one he knows that broke a crankshaft was at low RPM's and lugging it.
Mikediesel beat on his lly alot. I gave up count on turbo setups but I'd fare to say in the 5-10 range if not more. I think Mike made over 800 with his 472. Never killed that motor...dudes truck is a freak and he is very close with his tuner so they got that puppy well dialed in
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He didn't make over 800 track proven 680-700iirc he did dyno like 750 on custom autos dyno.
My stock crank took 275k and almost 100k of that at 600+hp and 1000+ tq never broke
I thought he hit over 800, maybe it was 750 I don't remember. I know they dyno isn't the real calculator.
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Well then mine might just make it until i get this other one built lol
Its just weird bc an older gentlemen i talked to said he had an LBZ that broke the crank at a stoplight at IDLE and it was COMPLETELY stock, nothing had been done to that truck at all. Im going with a New LML crank with AF cam so we'll see how that setup goes.
Mt stock engine I had on the race truck took a single 75mm on stock sticks set on kill 3 days of beating on it before it bend a rod. My luck caught up to me lol
Git so sick of waiting for my crank to break I said screw it and moved on from a dmax. Happy with my tractor and spark plug truck
Git so sick of waiting for my crank to break I said screw it and moved on from a dmax. Happy with my tractor and spark plug truck
It's impossible to do but I'd like to know the percentage of Duramax trucks that have broken cranks.
If my truck ever breaks the crank I'll probably be done with Duramax's.
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If my truck ever breaks the crank I'll probably be done with Duramax's.
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Percentage as in all dmax built vs those that have broken? Or which models have broken in comparison to each other? There is a poll in this thread that gives you a bit of an indication to the latter.
Not sure everyone that posted they broke in this thread did the poll though.
i cant see the poll without selecting a crank i broke... i havent broke one yet
201k on my stock crank and built the engine 41k ago. i stay between 600hp and 800 but mainly on 600hp. its seen LOTS of low rpm pulls under boost and heavy throttle when i tow, stock or built. thats from 1500rpm on up.
At this point in time the LB7,LLY / LBZ,LMM comparison is the only meaningful comparison LML is still relatively new. What do you think this really means dose it point at any possible cause??? It sure would be nice if it was figured out..
good to know. thanks dale!
LML isnt new anymore. its been out since 2011 so we are going on 5 years. Hell the LBZ and LMM combined barely hits that mark. there certainly isnt as many "big HP builds" as their are the previous generations though which may part of the reason we dont see more.
Im still with what Ben and others said long ago. breaking a crank is rare and some of you all get paranoid. LBZ/LMM seems to be more prone due to where GM removed weight and added it back in (from pistons to balancer). iT makes sense. now ill probably go out, start my truck and my crank will break :rofl:
Thanks for the breakdown I didn't realize the LBZ/LMM was such a short run. I am a little paranoid reading through all this, I certainly hope neither of us break a crank.
:hug:
There are plenty of LML's with as many or more miles as the rest of the models that haven't broke both stock and built respectively. Many were stockish when they did break but regardless the numbers aren't as high as the LBZ/LMM even though the lml has more stock hp/tq. LML has been in production almost as long as the LBZ/LMM.
This leads me to believe that either the crank was better in them or they do not have as big of a harmonics issue as the later models. Either way I went new LML crank and AF cam so will see how that works out for me.
Also I believe the cracking piston issue in the LBZ/LMM was more of a crap shoot bad luck of the draw then the broken cranks are. I still believe the crank thing is more of a when not if problem if you own an LMM or older. My recommendation is to never reuse a crank regardless of what it looks like. The $600 odd dollars for the LML seems to be worth it in my mind.
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This leads me to believe that either the crank was better in them or they do not have as big of a harmonics issue as the later models. Either way I went new LML crank and AF cam so will see how that works out for me.
Also I believe the cracking piston issue in the LBZ/LMM was more of a crap shoot bad luck of the draw then the broken cranks are. I still believe the crank thing is more of a when not if problem if you own an LMM or older. My recommendation is to never reuse a crank regardless of what it looks like. The $600 odd dollars for the LML seems to be worth it in my mind.
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I believe there have been more LML's built than any other gen code. I think I read that GM has some type of balancing program in the Ecu. Maybe that's what's helping them out...