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Old 03-23-2017, 04:05 PM   #21
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I do about 1 or 2 a month this problem either #5 or#6 and every time it's been lack of oil
to the rod. I did have one that the rod bolts came out really weird from the factory 100k on the speedo but the majority had been an oil leak not seen and motor run dry!
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Old 03-23-2017, 05:42 PM   #22
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Old 03-23-2017, 05:46 PM   #23
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Old 03-23-2017, 07:10 PM   #24
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First picture was deceiving looking. That's an late pattern bowl


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Old 03-24-2017, 05:34 AM   #25
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800hp wasn't the issue, it's that 1800lb-ft that killed it

Did the truck ever idle weird, or have a shake? Rods can be bent for a long while before one decides to exit stage left.
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Old 03-24-2017, 05:43 AM   #26
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800hp wasn't the issue, it's that 1800lb-ft that killed it .


Bingo. Most of what I've seen and read about keeping a stock bottom end together is limiting the torque output of the engine.
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Old 03-24-2017, 06:11 AM   #27
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Yeah it definitely didnt help making that much torque down low. Lavon told me that day before I left the shop I needed to go to a larger housing on my manifold charger cause the stock bottom ends don't hold up very long. I was just hoping I would of atleast made it home first so I could of fixed it. But guess it was its time to go lol. Going to run a big single this time around with girdled block and billet long rods.
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Old 03-24-2017, 06:20 AM   #28
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Quote:
Originally Posted by JWhite View Post
800hp wasn't the issue, it's that 1800lb-ft that killed it

Did the truck ever idle weird, or have a shake? Rods can be bent for a long while before one decides to exit stage left.
No it ran very smooth, the only thing I noticed that stood out was a very faint gravel sounding noise coming from the engine for a second under acceleration or any load but if free revd in park or neutral you couldn't hear it and only could hear it from inside the cab. After I left getting it dyno tuned the noise was a lot more noticeable and had planned on tearing into it when I got it back home but we only made it 4hrs into the 6hr drive home when she let go.
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Old 03-24-2017, 01:54 PM   #29
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First picture was deceiving looking. That's an late pattern bowl


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Yes it is , looks like the center stood up like a 03 piston .
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Old 03-24-2017, 03:11 PM   #30
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Quote:
Originally Posted by JWhite View Post
800hp wasn't the issue, it's that 1800lb-ft that killed it

Did the truck ever idle weird, or have a shake? Rods can be bent for a long while before one decides to exit stage left.
CR fracture capped rods rarely bend, they just break. We get a lot of literally bone stock engines in that chuck rods not caused from a lack of oil.
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Old 03-24-2017, 04:03 PM   #31
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Here's what your piston should look like

Click the image to open in full size.[/URL]

Who lives on a piston where no one can see...
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Old 03-25-2017, 08:26 AM   #32
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Quote:
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Everything that happened to your engine is like a mirror image to one I have in my shop right now. It was closer to 900 but with old tuning technology. Cylinder 5, holes on either side, valve prints, cracked piston. It actually took a chunk out of the starter and bent the mount for the trans cooler as well.
Jw what you mean by old tuning technology

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Old 03-25-2017, 08:34 AM   #33
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Who lives on a piston where no one can see...
Stevie-Wonder-I-See-What-You-Did-There.jpg
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Old 03-25-2017, 09:23 AM   #34
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CR fracture capped rods rarely bend, they just break. We get a lot of literally bone stock engines in that chuck rods not caused from a lack of oil.
Oh, you mean like these that bent and didn't break? A lot of trucks run around with short rod syndrome, and when people keep driving them, then they break.
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Old 03-25-2017, 10:05 AM   #35
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I've always been curious to see what deflection they will take before they rupture.

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Old 03-25-2017, 11:09 AM   #36
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I've always been curious to see what deflection they will take before they rupture.

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I suppose it depends if they bend towards the driver or passenger side. Although, I'm not sure if kissing a cam is fair.
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Old 03-25-2017, 10:45 PM   #37
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Oh, you mean like these that bent and didn't break? A lot of trucks run around with short rod syndrome, and when people keep driving them, then they break.
Those are not Cummins rods. You realize when you bend a rod that cylinder then drops compression, and you basically develop a dead miss.
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Last edited by SledPuller21; 03-25-2017 at 10:48 PM.
 
Old 03-26-2017, 08:27 AM   #38
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Those are not Cummins rods. You realize when you bend a rod that cylinder then drops compression, and you basically develop a dead miss.
I know that, but it's still a powdered metal fractured cap rod. I disagree with having a dead miss, yes it's possible but there's a lot a variables. More than likely it will have enough cranking compression to light the fuel off.
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Old 03-26-2017, 02:04 PM   #39
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In my experience, a bent rod will exhibit a miss when engine temperate and IAT can't compensate. They can run smoothly otherwise, and be hard to diagnose.

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