Duramax Diesels Forum Truck of the Week
  #76  
Old 04-13-2019, 07:14 AM
Dallas S Dallas S is offline
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They told me they have sold just over 300 durastars...
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  #77  
Old 04-13-2019, 08:14 AM
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huey huey is offline
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Thatís not very many, makes me wonder, is it really better than a stock crank? I wish someone would post results with some mileage on their engine. At least 100,000 miles.
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  #78  
Old 04-13-2019, 09:10 AM
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Quote:
Originally Posted by Dallas S View Post
They told me they have sold just over 300 durastars...
Well that moves the decimal point a couple places to the left..

2% failure rate isn't what I would call a huge issue. But what I really hate about this industry, if not for Internet forums, everybody's aftermarket parts failures would be Zero....

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  #79  
Old 04-13-2019, 05:01 PM
CRAWLEN CRAWLEN is offline
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Quote:
Originally Posted by huey View Post
Thatís not very many, makes me wonder, is it really better than a stock crank? I wish someone would post results with some mileage on their engine. At least 100,000 miles.

well its the same price as stock and better steel, also rated at "800hp" once we get past the thrust bearing issues might see what they can do.


my plan is to push one of these at that point of what they rate it for.


reason i bought one is because my stock crank was shagged. just because there has been some failures doesn't mean its a bad product it will be a bad product if they don't resolve the issues.



its just like how people have had exergy injectors fail, carrillo rods fail, pistons ect. there will always be defects in products and callies have picked this up and trying to resolve it probably a bit piss poor on how they are doing it, but sounds like they are trying. but time will tell, im sure there is a few people out there that have racked up some miles with out an issue. but who knows
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  #80  
Old 04-13-2019, 05:02 PM
CRAWLEN CRAWLEN is offline
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kidturbo, 100% i didn't know about this crank issue till i stumbled across this thread.
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  #81  
Old 04-14-2019, 10:32 AM
CRAWLEN CRAWLEN is offline
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So, received an email back with some info. And well it's interesting that's for sure.
The taper and surface finish makes sense as to why it would chew out the thrust bearings.

But sounds like they have had some with bad thrust bearings and in correct thrust.
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  #82  
Old 04-14-2019, 01:28 PM
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All sounds reasonable, until that last paragraph.. Unless all these failures have been in LML blocks, I don't see his installation remarks being relevant. If rear cap alignment is that critical, this issue should have shown up on other builds using stock or different cranks by now.

Had a nice chat yesterday with my metallurgy engineer buddy responsible for pieces of alloy a lot more critical than crankshafts. His first thought was surface harness, and process used to heat treat. If induction hardened, it doesn't go very deep. So it's possible the final machining process cut through the surface hardness.

Since the stock cranks break so commonly, one could imagine part of the fix theory could been soften em up in the core. But that's pure speculation. However my buddy did ask what the Rockwell tests revealed...



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  #83  
Old 04-14-2019, 02:23 PM
CRAWLEN CRAWLEN is offline
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And this is the response I got when I ask if it was a batch issue and incorrect hardness.
Well it appears my crank is fine.


I guess now all I do with my engine builder is check the surface finish and that the surface is flat not on a angle and we should be fine.. fingers crossed.


If it does fail hopefully doesn't causes damage to everything.
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  #84  
Old 04-14-2019, 03:51 PM
CRAWLEN CRAWLEN is offline
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The way they are talking about it, feels like they don't want to admit to the public it was a batch issue with some problems. because after she checked my SN it was ok. so leads me to believe they have narrowed the issue down to a batch, the poor surface finish and tapered surface they want me to check could lead to the same issue everyone is having, but then they could of had a batch with a hardness issue they don't want to publicly say.



But who knows I'm just going to send it now, if it fails well i guess its billet mains and a billet crank time, possibly socal stroker
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  #85  
Old 04-14-2019, 04:18 PM
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Quote:
Originally Posted by kidturbo View Post
All sounds reasonable, until that last paragraph.. Unless all these failures have been in LML blocks, I don't see his installation remarks being relevant. If rear cap alignment is that critical, this issue should have shown up on other builds using stock or different cranks by now.

Had a nice chat yesterday with my metallurgy engineer buddy responsible for pieces of alloy a lot more critical than crankshafts. His first thought was surface harness, and process used to heat treat. If induction hardened, it doesn't go very deep. So it's possible the final machining process cut through the surface hardness.

Since the stock cranks break so commonly, one could imagine part of the fix theory could been soften em up in the core. But that's pure speculation. However my buddy did ask what the Rockwell tests revealed...



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Your first paragraph is my thoughts exactly. That was a BS comment on his part. We’d of been seeing this for years and years using LML blocks is nothing new.
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  #86  
Old 04-14-2019, 05:47 PM
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With my new engine on gonna keep cutting open my oil filters and check for bearing material. Will probably pull it next winter and inspect. This is definitely going to be on my mind all season even though I was told it should be fine.
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  #87  
Old 04-23-2019, 02:05 PM
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This is getting old quick. What update if nothing's needed?
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  #88  
Old 04-23-2019, 03:57 PM
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Sorta reminds me of my hip Dr telling me the chrome plated steel on steel hardware he installed might need a "revision."

To which I replied "Did you install a USB port in my ass or something, cause only software gets revisions, hardware gets REPLACED."

Is nice to see Wagler stepping up on this one.

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  #89  
Old 04-23-2019, 07:01 PM
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Not sure if this was posted yet or not...



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  #90  
Old 04-24-2019, 05:18 PM
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So, if I’m reading this correctly, they’re blaming it on everything but their cranks itself?
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