No.lance flake wrote: ↑Wed Sep 19, 2018 10:39 amWill do i think the blueing is from the bottom piece swinging around and hitting the upper piece after failureKevin Johnson wrote: ↑Wed Sep 19, 2018 10:31 am
Take high resolution pictures of the area of the fracture where the bluing is seen on the upper beam section. Heat is generated when a fracture flexes.
Broke connecting rod?
Moderator: Team
-
- HotPass
- Posts: 9365
- Joined: Tue Nov 22, 2005 5:41 am
- Location:
Re: Broke connecting rod?
Driving Force Online: BREAKING NEWS—Ohio Governor Signs SEMA-Supported Vehicle Freedom Bill Into Law!
-
- Pro
- Posts: 286
- Joined: Tue Apr 01, 2008 12:14 am
- Location: union ms
-
- Pro
- Posts: 286
- Joined: Tue Apr 01, 2008 12:14 am
- Location: union ms
Re: Broke connecting rod?
Kevin Johnson wrote: ↑Wed Sep 19, 2018 10:42 amNo.lance flake wrote: ↑Wed Sep 19, 2018 10:39 amWill do i think the blueing is from the bottom piece swinging around and hitting the upper piece after failureKevin Johnson wrote: ↑Wed Sep 19, 2018 10:31 am
Take high resolution pictures of the area of the fracture where the bluing is seen on the upper beam section. Heat is generated when a fracture flexes.
I will get a better pic of that this evening.
-
- Pro
- Posts: 286
- Joined: Tue Apr 01, 2008 12:14 am
- Location: union ms
Re: Broke connecting rod?
If there is somewhere i can send pieces to for real lab analysis i would be glad to. I really want to know what caused this failure. I want to make sure i did nothing wrong and i want to find his problem so we can fix it as best possible
-
- HotPass
- Posts: 9365
- Joined: Tue Nov 22, 2005 5:41 am
- Location:
Re: Broke connecting rod?
SwRIlance flake wrote: ↑Wed Sep 19, 2018 10:48 am If there is somewhere i can send pieces to for real lab analysis i would be glad to. I really want to know what caused this failure. I want to make sure i did nothing wrong and i want to find his problem so we can fix it as best possible
https://www.swri.org/
Driving Force Online: BREAKING NEWS—Ohio Governor Signs SEMA-Supported Vehicle Freedom Bill Into Law!
Re: Broke connecting rod?
Just keep in mind, should anyone ask, these Callies compstar rods are manufactured OFFSHORE. Callies then finishes and checks them thoroughly and off they go. I personally feel 99% of these rods will be fine up to a certain point based on hp, rpm range and # of cycles but guess what? sh-t happens.
Re: Broke connecting rod?
My mistake in that I see that these were Ultra rods. These are fully made in the USA . Sorry about that.fdicrasto wrote: ↑Wed Sep 19, 2018 11:56 am Just keep in mind, should anyone ask, these Callies compstar rods are manufactured OFFSHORE. Callies then finishes and checks them thoroughly and off they go. I personally feel 99% of these rods will be fine up to a certain point based on hp, rpm range and # of cycles but guess what? sh-t happens.
-
- Pro
- Posts: 286
- Joined: Tue Apr 01, 2008 12:14 am
- Location: union ms
Re: Broke connecting rod?
You do not have the required permissions to view the files attached to this post.
-
- Pro
- Posts: 286
- Joined: Tue Apr 01, 2008 12:14 am
- Location: union ms
Re: Broke connecting rod?
See if those above answer your question. I don't see any blueing at the breakKevin Johnson wrote: ↑Wed Sep 19, 2018 10:42 amNo.lance flake wrote: ↑Wed Sep 19, 2018 10:39 amWill do i think the blueing is from the bottom piece swinging around and hitting the upper piece after failureKevin Johnson wrote: ↑Wed Sep 19, 2018 10:31 am
Take high resolution pictures of the area of the fracture where the bluing is seen on the upper beam section. Heat is generated when a fracture flexes.
-
- HotPass
- Posts: 9365
- Joined: Tue Nov 22, 2005 5:41 am
- Location:
Re: Broke connecting rod?
It is possible that the bluing seen in the collection photograph is an optical illusion ?? But you appear to see it as well.
https://www.efatigue.com/training/Chapter_3.pdf
When you bend a paperclip wire back and forth it generates heat in the area of plastic deformation. Eventually failure ensues. If the rod was accidentally dropped or struck and a small unnoticed nick was created that would be a stress raiser. There could also have been an invisible internal flaw in that area.
Send the pieces to be looked at by a trained metallurgical engineer.
https://www.efatigue.com/training/Chapter_3.pdf
When you bend a paperclip wire back and forth it generates heat in the area of plastic deformation. Eventually failure ensues. If the rod was accidentally dropped or struck and a small unnoticed nick was created that would be a stress raiser. There could also have been an invisible internal flaw in that area.
Send the pieces to be looked at by a trained metallurgical engineer.
Driving Force Online: BREAKING NEWS—Ohio Governor Signs SEMA-Supported Vehicle Freedom Bill Into Law!
-
- Guru
- Posts: 1602
- Joined: Sat Dec 24, 2011 10:02 am
- Location: melfort saskatchewan Canada
Re: Broke connecting rod?
This may sound way out in left field, what would happen if there was nothing in that cylinder ? Like no fuel at all to compress ? And that rod was just kind of free-wheeling ? Is it possible it could pull apart from the Rpm but no cushion to hit against ?
With no cushion, the piston wants to just keep going up, but the crank is trying to pull it down, at 7500 rpm thats alot of force.
Maybe it slightly bent a valve first, then lost compression, then pulled apart the rod ?
Brian
With no cushion, the piston wants to just keep going up, but the crank is trying to pull it down, at 7500 rpm thats alot of force.
Maybe it slightly bent a valve first, then lost compression, then pulled apart the rod ?
Brian
Last edited by prairiehotrodder on Wed Sep 19, 2018 6:07 pm, edited 2 times in total.
The Word of God is quick and powerfull
www.therocketshop.blogspot.com
www.therocketshop.blogspot.com
Re: Broke connecting rod?
I think it just broke,I mean how many rods are they forging every day I mean they all can’t come out perfect it just fatigued after a few cycles and broke.Sometimes stuff just breaks.
-
- New Member
- Posts: 41
- Joined: Tue Feb 12, 2013 4:13 pm
- Location:
Re: Broke connecting rod?
What parts were carried over on the three engines that broke? -Ignition- fuel- manifold?
Re: Broke connecting rod?
I still think that rod seperated in the beam under tensile loading and a defect or prior damage to the rod may have contributed. I am just not sure that Callies rod was strong enough for the use you are putting it to. Don't get me wrong here, Callies Ultra h-beam rod is a great rod and their quality is excellent.
Take a look at Wiseco's new BoostLine rod. Its beam design is stronger than the Callies H-beam and I think they deserve some consideration for your use. JMO
Take a look at Wiseco's new BoostLine rod. Its beam design is stronger than the Callies H-beam and I think they deserve some consideration for your use. JMO
The Older I Get, The Dumber I Get
-
- Guru
- Posts: 1575
- Joined: Mon Apr 04, 2011 8:54 pm
- Location: central Florida
Re: Broke connecting rod?
Brian, what you described in the above replies exactly what happens on every exhaust stroke pretty much. Mark H.