Competition 5.9 vs 6.7 Parts to check out - Pictures!

[sbentz]

That's 4. 88" and 4. 21", respectively, for those who are SI-challenged.

Or 407. 6", or 6. 67L.



Cummins is making it clear that the light duty (non-commercial) Dodge engine may or may not be the same as the one seen at the truck show. It will be up to DC to announce that. Mum is the word.



Steve, you did a great job on that article, by the way.

 

[RacinDuallie]

OK, after finally getting my hands on a failed 6. 7B (structural block, used in AGCO farm tractor) 12V, rotary CAV pump engine,here are a few interesting things that I have found:

First the rods. This photo has the 6. 7 on the left, 5. 9 Fracture split in the middle, and forged on the right.

Scott do you have a part # for that 5. 9 Fracture split rod? Meaning the number used to order them? Do you know the weight of it?

 

[HoleshotHolset]

What's the deal with the heat treated crank? So far, not many people have good explanations for the "Who, What, Where, When, Why, How" questions.

Attached is a (sorta crappy) pic of the crank in my Cummins HPCR 3. 9L...



Also - Scott - did that 6. 7L structural block have (for lack of a better term) a 'girdle' that holds the oil pan to the block?



All of the B-Series I've ever seen just bolt the oil pan right to the block. Not my 3. 9L... (I'm not complaining... it's super beefy and allows you to swap the pan end for end for front/rear sump after getting a new pickup tube... with no other mods. )



Matt

 

[sbentz]

Scott - did that 6. 7L structural block have (for lack of a better term) a 'girdle' that holds the oil pan to the block?



Matt

I would not call the pan a girdle, I would call it a darned railroad bridge. It weighs about 200 pounds. Cast Iron. I am going to send it to Comp to put on his truck 'cause he has been on a titanum and carbon fiber diet lately, and needs to keep the front end of that truck planted.



The block was webbed on the sides and dowelled between the front and rear housings in order to be a structured member of the tractor. Super heavy. I still have the block and pan, but think it would make a great planter.

 

[sbentz]

Hmmmm...



Now, take the big bore block, 4. 21", add a 6. 7 structure crank, 5. 2" and build up a 434 cube motor... .



Then offset grind the crank a 1/4" (5. 45") and bore the block an 1/8" (4. 335") and get 482 cubes. And a bunch of broken parts.....

 

[bluthndr]

Now THATs the good stuff!

 

[TractorNut]

Hmmmm...



Now, take the big bore block, 4. 21", add a 6. 7 structure crank, 5. 2" and build up a 434 cube motor... .



Then offset grind the crank a 1/4" (5. 45") and bore the block an 1/8" (4. 335") and get 482 cubes. And a bunch of broken parts.....

Now you're sounding like a tractor puller. . :-laf