The "famous" connecting rod pic

[DPelletier]

Hmmm,

Piston looks substantially more robust too.



Dave

 

[hasselbach]

Generally when you get a main or rod knock the bearings are toast on any engine. I guess I have witnessed the bearing surfaces being an issue on V8's as I've seen several wrecked motors with wiped out bearings.

Anyway, all nitpicking aside, you don't really think a DM has a chance in the hot place of outlasting a Cummins on average, do you? C'mon, I know your smarter than that.



Dave

Nah, I agree with you, I'm sure the Cummins will go twice the mileage that the DM will run, on average. And if you use your truck for a business or personal use that requires massive amounts of travel, the Cummins is the motor.

 

[loncray]

My 5,245 mile roundtrip from Virginia to Wyoming this summer went off without so much as a hiccup from my truck. I even drove 1,900 miles in a single shot (stopped only for food, fuel and bathroom breaks) to get home - the truck was awesome! So, I agree about the personal use statement - Cummins rules!

 

[Billy Golightly]

Does anyone happen to have the picture comparing the 6. 0PSD and the Duramax to the Cummins saved on their computer? Looks like the picture isn't hosted anymore

 

[EMD-Run8]

Yeah, when you try explaining that one to the ford guys they suddenly get that deer in the headlights look. That Fairbanks-Morse pic made me think about the size of some the engines in the locos I run. An EMD "645" engine is 645 cubic inches per cylinder (!). Times 16 is 10,320 inches!!!!!! Or their new four cycle "H" engine in the SD90MAC has 265mm bore cylinders!

 

[jjohn]

#ad

Does anyone happen to have the picture comparing the 6. 0PSD and the Duramax to the Cummins saved on their computer? Looks like the picture isn't hosted anymore

#ad

 

[Billy Golightly]

Thanks, that first picture is exactly what I was looking for!

 

[bombero]

Great pic. Do you think any of those rod are "forged" Really forged liked in the high performance racing engines? I dont think so. I dont think our crank shaft is forged ether. What got me going was if our alum wheels are "forged' > Casting now is now the state of the art and I think almost as good in most applications

 

[Yo Hoot]

#ad

 

[jungledave]

Carlin dodge in colorado springs has a board that you can actually touch and feel all three of the rods and pistons. The cummins is impresive but the new 6. 0 is one heck of a rod also. It is soo much heavier than the old powerstroke. It proportionally comparable to the cummins. The Duramax rod looks so light duty to the cummins and the 6. 0 ford. The cummins and the ford use the angled cap. The cummins piston is huge!

 

[ChrisOlson]

pictures

I read earlier in the thread that you guys like pictures of the big diesel engines

So here are a few if you like them I can post more

 

[ChrisOlson]

pictures

pict 1



is A liner being lowered into place on a MAK inline 9cyl 4 cycl torbocharged



Diesel in the back ground is a piston being Micd. for tolerences

 

[ChrisOlson]

picture 2

picture 2 is a piston being lowered into the liner on number 9 cylinder

 

[ChrisOlson]

picture 3

picture 3 is the liner being lapped to the block this usally takes about 6 hours



and 3 different lapping pastes to get the liner to mate to the block



once again this a MAK inline 9 cylinder turboed 4 stroke



do you guys want to see more????

 

[ChrisOlson]

riding the bars

picture 3 is the liner being lapped to the block this usally takes about 6 hours



and 3 different lapping pastes to get the liner to mate to the block



once again this a MAK inline 9 cylinder turboed 4 stroke



this is called riding the bars



do you guys want to see more????

 

[rbattelle]

Cool pics! What does it mean to "lap" the liner to the block?

 

[ChrisOlson]

Where the liner meets the block it is a sealing surface the sealing surface has to mate flush this is done by using Lapping Paste or grinding paste to remove metal or hills and hills and valleys on the block and the liner this done bythe weight of the liner on the paste on the block and rotating the the liner back and forth thus removing the metal to create a sealing surface. hope i explained it ok

 

[rbattelle]

I thought that might be what's done, but I'm amazed a person can do that by hand with such large heavy parts.

 

[jsimpson]

Interesting that the rod for the PSD is so much wimpier than the one for the Duramax, despite having a longer stroke. I can almost see that thing bending and flexing with every compression stroke--kind of like when you hit a nail with a hammer and it flexes before returning to form.

That's not from the Duramx, but from the previous GM 6. 5 diesel.

 

[GHanna]

That's not from the Duramx, but from the previous GM 6. 5 diesel.

A longer rod has nothing to do with a longer stroke. The stroke is determined by the crankshaft.