Look inside the 25+ redesign engine/block/head

[Brutal_HO]

 

[MacksRam]

Overall, I feel Dave had more positive comments than negative comments as it relates to the new 2025 Cummins engine.
People have been saying the head/valves/rocker arms/lifters, etc on the 2025 are the SAME as the 2019-2024 models--Dave proved there are differences--prayerfully these differences are going to result in a more solid platform (especially when Ram gets the "electrical" issues resolved).
The video kept "buffering" for me, so it was difficult to watch.

 

[Brutal_HO]

Overall, I feel Dave had more positive comments than negative comments as it relates to the new 2025 Cummins engine.
People have been saying the head/valves/rocker arms/lifters, etc on the 2025 are the SAME as the 2019-2024 models--Dave proved there are differences--prayerfully these differences are going to result in a more solid platform (especially when Ram gets the "electrical" issues resolved).
The video kept "buffering" for me, so it was difficult to watch.

I've not really seen anyone saying the 25+ engine redesign has the same heads, etc. that were used on the 19-24 CGI. Must just be Bookface fools.

Early on before release, there were many that saw the leaked photos, several of which myself and a few others had early access to, claiming the head was aluminum. That was a big LOL. The valve cover riser is aluminum.

The hydraulic lifters remain, and use the same part number. That doesn't mean they are identical to earlier lifters, there are different suppliers. In the engine he tore down, I saw that they did not have any oil control(?) grooves cut in them.

I think there's merit to the theory proffered by many including Dave that the CGI block has too much flex and the lifters are "fretting" due to this.

 

[LuckyK]

I saw that video too. Agree - mostly positive. But he was weighing a 2026. And seemed to imply that the new block and intake started in 26. I’m sure someone has ‘schooled’ him by now that it actually started in 25. He’s usually pretty good about admitting when he misspeaks. Regardless, really enjoyed watching him go through it. I wish he would have put the rocker mounts on a flat surface to see if any gaps appeared.

 

[CdnHO]

Did I hear it right? My hearing is pretty bad. Earlier engines only had a camshaft bearing at each end?? I may have misinterpreted the video, but found it hard to believe that the camshaft would not have more bearing support than that. Of course it has been almost 60 years since I was in the trade and things have changed. LOL. The 2025/6 now has a bearing between each cylinder??

 

[superjoe83]

Did I hear it right? My hearing is pretty bad. Earlier engines only had a camshaft bearing at each end?? I may have misinterpreted the video, but found it hard to believe that the camshaft would not have more bearing support than that. Of course it has been almost 60 years since I was in the trade and things have changed. LOL. The 2025/6 now has a bearing between each cylinder??

The flat tappet engines cams had the same number of bearing journals, but they had no bearing inserts, the cam journals rode directly on the block except for the end journals, I believe the old 5.9's only had a bearing on the gear end.
They started putting bearings on all of the journals on the 19+ engines