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My turn for valvetrain failure?

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Old Apr 11, 2022 | 11:06 PM
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Originally Posted by HeyYou
So how do the cam lobes get oil?? Doesn't look like anything is going to simply run down on to them, and the bleedout from the cam bearings ain't gonna help either. But, since I have seen some of these with close to 300K on them..... gotta be getting it from somewhere.....
Something changed from the pre-eagle block (no oiling issues) to the eagle block(many oiling issues).

Robert and I were both looking at the one on his engine stand. We're wondering if there's a way to drill and tap some 1/8 NPT ports into that dry deck, run a 3AN hose off the oil temp port & put squirters on the cam (like big water/meth nozzles, or small nitrous pills type thing).
 
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Old Apr 12, 2022 | 08:42 AM
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Originally Posted by magnethead
Something changed from the pre-eagle block (no oiling issues) to the eagle block(many oiling issues).

Robert and I were both looking at the one on his engine stand. We're wondering if there's a way to drill and tap some 1/8 NPT ports into that dry deck, run a 3AN hose off the oil temp port & put squirters on the cam (like big water/meth nozzles, or small nitrous pills type thing).
That would likely work..... I would like to see a diagram of how pressurized oil is routed thru the engine. Might be able to just drill some tiny holes in an existing oil passage, and not have to worry about plumbing.... Of course, after doing so, I would also run a high volume oil pump......
 
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Old Apr 16, 2022 | 11:04 PM
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Originally Posted by HeyYou
That would likely work..... I would like to see a diagram of how pressurized oil is routed thru the engine. Might be able to just drill some tiny holes in an existing oil passage, and not have to worry about plumbing.... Of course, after doing so, I would also run a high volume oil pump......
The issue doesn’t come from oiling directly. It comes from heat. Yes the oil is used for cooling as well. The main issue is the VVT and the lack of EGR that the 03-08 motors had. The VVT acts as an EGR by raising cylinder temps which heats the oil more which transfers down to the cam and softens the cam. Note how they referenced the hardness of the cam in the thread.
 
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Old Apr 17, 2022 | 09:53 AM
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EGR is used to LOWER combustion temps, by introducing gases that won't burn (again)..... Higher combustion temps lead to the formation of NOX, something the EPA doesn't really like.

That said, it seems that installing an oil cooler really wouldn't be a bad idea either....
 
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Old Apr 18, 2022 | 02:07 AM
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Originally Posted by HeyYou
EGR is used to LOWER combustion temps, by introducing gases that won't burn (again)..... Higher combustion temps lead to the formation of NOX, something the EPA doesn't really like.

That said, it seems that installing an oil cooler really wouldn't be a bad idea either....
you are thinking diesel. NOX is not an issue on the gas motors. The VVT raises cylinder temp to give a more complete burn so the EGR was not needed but could still meet the even stricter emissions.
 
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Old Apr 18, 2022 | 08:51 AM
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Originally Posted by Gotts2BMe
you are thinking diesel. NOX is not an issue on the gas motors. The VVT raises cylinder temp to give a more complete burn so the EGR was not needed but could still meet the even stricter emissions.
Would love to see where you are getting that information. Everything I am seeing is telling me the exact opposite. Even Dodge specific applications. The whole idea behind EGR is to LOWER combustion chamber temps, to prevent the formation of oxides of nitrogen..... here is just one article that disagrees with you. There are many, and I can't find any that agree.
 
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Old Apr 18, 2022 | 10:28 AM
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Originally Posted by HeyYou
Would love to see where you are getting that information. Everything I am seeing is telling me the exact opposite. Even Dodge specific applications. The whole idea behind EGR is to LOWER combustion chamber temps, to prevent the formation of oxides of nitrogen..... here is just one article that disagrees with you. There are many, and I can't find any that agree.
the 09+ trucks do NOT have an EGR just a cam phaser.
 
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Old Apr 19, 2022 | 09:14 AM
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Originally Posted by Gotts2BMe
the 09+ trucks do NOT have an EGR just a cam phaser.
I am well aware of that, they use cam timing to control cylinder temps. Thus, no need for the EGR valve. They accomplish the exact same thing, with a different method.
 
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Old Apr 19, 2022 | 12:53 PM
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Originally Posted by HeyYou
I am well aware of that, they use cam timing to control cylinder temps. Thus, no need for the EGR valve. They accomplish the exact same thing, with a different method.
and under light load and idle the cam is advanced to raise cylinder temps to help burn the unburnt fuel to take less stress off the cats.

I really wish I had a complete gen 3 hemi truck in stock to get accurate exhaust manifold temp readings from to show you. When I bring out the race truck (moderately modified gen 3 hemi) next week, I will get my VVT hemi truck as well; park them side by side, heat soak them both, and give you exhaust manifold temps at cylinders 1 and 2 of both trucks sitting side by side.
 
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Old Apr 19, 2022 | 02:51 PM
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They also tend to lean them out at idle. At least, GM sure did.
 
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