CP4 Changes - to large dimple symmetrical cam version

[Olive pearl 3500]

7-22-20 build date.

View attachment 7161

If they just started as of 9/1/20 with the updated 1 dimple pump..wonder how that pump got installed on 7/22/20 build date? Hmmmm lol

 

[mostcorey95]

If they just started as of 9/1/20 with the updated 1 dimple pump..wonder how that pump got installed on 7/22/20 build date? Hmmmm lol

They were available before 9/1/2020. Some may have them before that date but as of that date is when all old ones were no longer being installed.


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[Olive pearl 3500]

If they just started as of 9/1/20 with the updated 1 dimple pump..wonder how that pump got installed on 7/22/20 build date?

Oh and my 3500 dually with build date 9/2/20 has the 1 dimple pump and engine and pump is really quiet.

 

[mostcorey95]

Oh and my 3500 dually with build date 9/2/20 has the 1 dimple pump and engine and pump is really quiet.

I have heard that this new pump runs quieter and smoother.


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[Olive pearl 3500]

I have heard that this new pump runs quieter and smoother.


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One more thing my bought new 2018 ram 2500 engine was alot louder than my new one is, i could hear it rumbling when i started from inside house.... this new truck..i need to listen to see if its running. Thanks i appreciate your reply.

 

[Rich]

I just hope to god that when mine goes I'm not in the middle of death valley, towing the RV, or have the family with me.

 

[mostcorey95]

One more thing my bought new 2018 ram 2500 engine was alot louder than my new one is, i could hear it rumbling when i started from inside house.... this new truck..i need to listen to see if its running. Thanks i appreciate your reply.

Yes they new design allows it to be quieter with pilot injections and post injections. Also the reduced compression in the engine.


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[elephantrider]

alot of the quiet is due to the lifter change on the new cgi block.

 

[Deleted member 80]

And the scissor gear to take gear rattle away.

The pilot injection and multi-event injection have been around for a while, and post injection is employed to light off the cat. My '05 had three(?) events, and now they are up to eight(?).

 

[elephantrider]

yup. went to 3 events on the 600 motor, I believe.

 

[Brutal_HO]

Yes they new design allows it to be quieter with pilot injections and post injections. Also the reduced compression in the engine.


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?

The SO went up in compression to 19:1, the HO is down to 16.9:1

Older 6.7L were 17.3:1.

Hydraulic lash adjusters (lifters), scissor gear drive, CGI and new damper design contribute to reduced NVH.

 

[Epsilon Plus]

?

The SO went up in compression to 19:1, the HO is down to 16.9:1

Older 6.7L were 17.3:1.

Hydraulic lash adjusters (lifters), scissor gear drive, CGI and new damper design contribute to reduced NVH.

Which is sad for many. We like to hear it crunch rocks. I can hear my what-ever-the-hell-it-is gear whine noise from the engine more than the damn diesel popping off most of the time.

 

[Cummins3]

Ram cares will there b a recall soon or anything??

 

[RV_Goose]

Ram cares will there b a recall soon or anything??

I doubt they can project anything not released to the public yet.

 

[UglyViking]

Which is sad for many. We like to hear it crunch rocks. I can hear my what-ever-the-hell-it-is gear whine noise from the engine more than the damn diesel popping off most of the time.

I felt the same, honestly almost bought an 18 just because it was louder. Lots of little niceties in these 5th gens though.

 

[Brutal_HO]

Which is sad for many. We like to hear it crunch rocks. I can hear my what-ever-the-hell-it-is gear whine noise from the engine more than the damn diesel popping off most of the time.

I felt the same, honestly almost bought an 18 just because it was louder. Lots of little niceties in these 5th gens though.

There's also ANC which can be defeated by unplugging the mic cables at the module for a permanent fix, or cracking open a window.

On a long haul, I'd rather have the quiet, much less fatiguing. However, I do find myself turning the radio down or off from time to time around town, just to hear the 6.7L of badness.

 

[UglyViking]

There's also ANC which can be defeated by unplugging the mic cables at the module for a permanent fix, or cracking open a window.

On a long haul, I'd rather have the quiet, much less fatiguing. However, I do find myself turning the radio down or off from time to time around town, just to hear the 6.7L of badness.

That is the reason I've not yet done anything. I will miss the summertime with the windows down listening to the engine. It took a bit to get used to the change coming from a 5.3 with exhaust and intake which was very mean sounding, but I quite like the sound of the 6.7, and the turbo whine is something cool. It's nice to keep the windows rolled on the highway and listen to podcasts though.

 

[Deleted member 80]

In a heavy pull there is no mistaking that there is a Cummins in the engine room.

 

[heyguy]

My build date was Aug 04, 2020 and thankfully I have the new style single dimple pump.

 

[garysol1]

7/20 build date...