Broken Crankshaft Count?

[DBUSHLB7]

I don't believe the breaking is related to HP. I'm sure it increases the risk, but when you have stock or mostly stock trucks breaking cranks, it makes it difficult to point the finger at HP or Tq.

I agree, I see far more completely stock trucks come into the shop with broken cranks(lbz/lmm mainly) than higher powered trucks. 99.5% of the built motor guys or higher hp guys all broke just cruising down the road not while making a lot of hp.

I appreciate your responses and point taken. It would still be nice to know some percentages. How many engines produced, how many broken cranks. All the buzz around here is mostly built engines breaking them? The high HP used has to accelerate the problem

 

[BHoward6.6]

^^ What was that like?

Uneventful, WOT at the end of a 1/8 mile track, loud bang, truck shook, puff of smoke. Still ran fine but the balancer was a little (ok a lot) shaky. Broke at the snout.

 

[Bigdirtylbz07]

I believe it does but there have been some people on here (with lbz or LMM) that have broken the crank on a full stock truck which was enough for me lol, but mine also was stock internal and it was pretty conservative at that. It broke the crank at just cruising speed,


Sent from a truck somewhere in the US

 

[Bigdirtylbz07]

My 1st crank breakage was at the #4 ~ http://www.duramaxdiesels.com/forum/showthread.php?t=37407

I actually commented on this way back when lol sucks to see that mine turned out the same way at the 4th main


Sent from a truck somewhere in the US

 

[SilveradoTwins02]

Uneventful, WOT at the end of a 1/8 mile track, loud bang, truck shook, puff of smoke. Still ran fine but the balancer was a little (ok a lot) shaky. Broke at the snout.

Ok. So what balancer did you have on it when it broke ?

 

[BHoward6.6]

Ok. So what balancer did you have on it when it broke ?

Ok, I will answer this if you tell me why you ask. There are basically 3 types, Stock, ATI, and Fluid. Is one better than the other?
Also, I have broke 2 cranks with 2 types of balancers. 1 at the #4 main and 1 at the snout. Which one would you like to know about?

 

[PACougar]

Ok, I will answer this if you tell me why you ask. There are basically 3 types, Stock, ATI, and Fluid. Is one better than the other?
Also, I have broke 2 cranks with 2 types of balancers. 1 at the #4 main and 1 at the snout. Which one would you like to know about?

I'd like to know what balancer was all of the broken cranks, I don't think more information is a bad thing.

 

[Burn Down]

They have broken with all the balancers... Stock, Ati, Fluid...

 

[PACougar]

They have broken with all the balancers... Stock, Ati, Fluid...

That doesn't mean one can't be better than another. It would provide more insight on how to fix the problem or at least show what doesn't make any difference.

 

[Burn Down]

That doesn't mean one can't be better than another. It would provide more insight on how to fix the problem or at least show what doesn't make any difference.

Maybe but I haven't noticed one over another... I would like to know what Fingers came up with on his Balancer idea. It's a shame that a few dip wads muddy up threads bad enough that some of the really smart guys don't want deal with it anymore...

 

[SilveradoTwins02]

Ok, I will answer this if you tell me why you ask. There are basically 3 types, Stock, ATI, and Fluid. Is one better than the other?
Also, I have broke 2 cranks with 2 types of balancers. 1 at the #4 main and 1 at the snout. Which one would you like to know about?

Did the fluid damper break the snout?

 

[BHoward6.6]

I'd like to know what balancer was all of the broken cranks, I don't think more information is a bad thing.

1st crank I broke was a stock motor, stock balancer, broke at the #4 main.
2nd crank I broke was a built motor with a ATI balancer, broke at the snout.

 

[PACougar]

Maybe but I haven't noticed one over another... I would like to know what Fingers came up with on his Balancer idea. It's a shame that a few dip wads muddy up threads bad enough that some of the really smart guys don't want deal with it anymore...

How can you tell if one doesn't make a difference over another if people aren't posting up what they had on when it broke? I only want to know because it could play a small part in getting more life out of the crank. As Mark said he notices less vibration on his dyno with socal damper, it may not be scientific but more information is still better than less.

 

[SilveradoTwins02]

Ok, I will answer this if you tell me why you ask. There are basically 3 types, Stock, ATI, and Fluid. Is one better than the other?
Also, I have broke 2 cranks with 2 types of balancers. 1 at the #4 main and 1 at the snout. Which one would you like to know about?

Also the ATI types are the only that have a press fit which should absorb most of the harmonics and is also the lightest of the 3. I have always run the ATI on my gasser race engines with great results. Fluid is the heaviest from what I have heard and I think would put the most strain on the snout. If I'm wrong I am sure someone will let us know.

 

[SilveradoTwins02]

1st crank I broke was a stock motor, stock balancer, broke at the #4 main.
2nd crank I broke was a built motor with a ATI balancer, broke at the snout.

Really. That is not what I would have thought at all! Wow. Surprised.

 

[Burn Down]

How can you tell if one doesn't make a difference over another if people aren't posting up what they had on when it broke? I only want to know because it could play a small part in getting more life out of the crank. As Mark said he notices less vibration on his dyno with socal damper, it may not be scientific but more information is still better than less.

Because most have stated what balancer they were using at one point... Not all the broken crank discussion has been in this thread Fingers thread discussed the balancers, He thought that a new one needed to be made and that was the end of the thread.

I don't see the point in figuring out what balancer will slow down my broken crank... I want one or something that is going to prevent it. As of now the Alt. fire cam seems to be the only thing that is close to preventing it altogether.

 

[DBUSHLB7]

How can you tell if one doesn't make a difference over another if people aren't posting up what they had on when it broke? I only want to know because it could play a small part in getting more life out of the crank. As Mark said he notices less vibration on his dyno with socal damper, it may not be scientific but more information is still better than less.

He also mentioned motor mounts and while bolted stock mounts seem to be the choice for strength and comfort, might the Merchant Mounts help spread some of that vibration elsewhere on the vehicle? Just thinking.... Although I'm guessing some of the built motor/broken crank trucks had the MA mounts.

More info can't hurt in this situation.

 

[PACougar]

Because most have stated what balancer they were using at one point... Not all the broken crank discussion has been in this thread Fingers thread discussed the balancers, He thought that a new one needed to be made and that was the end of the thread.

I don't see the point in figuring out what balancer will slow down my broken crank... I want one or something that is going to prevent it. As of now the Alt. fire cam seems to be the only thing that is close to preventing it altogether.

I don't think there is going to be some perfect solution that guarantees your crank won't break. I'd rather run a alt firing cam and the balancer that dampens the best. It seemed fingers was suggesting a heavier balancer as well.

 

[Burn Down]

I don't think there is going to be some perfect solution that guarantees your crank won't break. I'd rather run a alt firing cam and the balancer that dampens the best. It seemed fingers was suggesting a heavier balancer as well.

I still want to see proof of a broken crank running an Alt. fire cam... I have an ATI sitting in the garage near as I can tell it's the best currently offered. Does it dampen better, hell I don't know? I'm going to match the best parts that I can as you have mentioned.

 

[PACougar]

I still want to see proof of a broken crank running an Alt. fire cam... I have an ATI sitting in the garage near as I can tell it's the best currently offered. Does it dampen better, hell I don't know? I'm going to match the best parts that I can as you have mentioned.

Yeah, you mean the motor with a alt firing cam that's broken a crank myth:roflmao: You'd think this is a yeti spotting forum when it comes to finding proof of one that's broken.