6.7L cummins

[HotRodCummins12v]

Well i was just reading up on the new 07 cummins 6. 7L well in this article it says that Europ already has a 6. 7L which is a stroked 5. 9. anyone know if it is possible to get the crankshaft and rods to convert to a a 5. 9 to a 6. 7? I know I would love to try that conversion and a few other people that would be up to the task. Also I dont know if the block is the same or not, I currently have a 12v and if it is possible, i want a 6. 7. Let me know if you know anything about this conversion.

 

[RustyJC]

A key question, and one I've not seen answered, is whether or not Cummins raised the deck height on the 6. 7 to accommodate the longer stroke. If not, then the rods must be shorter or the piston pin placement must be higher in the 6. 7 - or both!



Rusty

 

[HotRodCummins12v]

i would assume that no matter what the change is, you might be able to get the pistons, connectiong rods and crank through cummins or maybe ebay, if they are mass produced by cummins, it should be possible, the only concern would have to be block/head differances.

 

[RustyJC]

Yeah, if they've raised the deck height, then it may be a real challenge getting that longer arm into a 5. 9 block - the extra stroke will have to be compensated for in aftermarket pistons or rods, and shortening the rods is going to worsen the rod length-to-stroke ratio. That's totally ignoring bottom end clearance, bearing size, etc. issues.



Rusty

 

[Alphacowboy]

ya must have missed the previous posts on this, but the 6. 7 that is currently out is a stroked 5. 9, but the new 6. 7 for 07 IS NOT a stroked motor. It was layed out in the artical on the new 07 cab/chassis trucks that it was NOT a stroked motor, but a new design all together.

 

[Alphacowboy]

and I am a big dummy head, as I didnt realize (read the whole post) that you wanted to stroke yours to 6. 7... inserts foot in mouth!

 

[jayhawktrailers.com]

SBENTZ works for cummins i'll pm him and ask if it's possible. He might know. He's always super helpful to everyone on TDR.

 

[DWitcher]

That would be defiantly cool to build a 6. 7.

 

[jayhawktrailers.com]

I pm SBENTZ and he said the 6. 7 uses a rear engine gear train so the crank would not work. Dang that woulda been sweet

 

[JasonCzerak]

I've always wondered why no one has ever modified the displacment of any of the diesels, including the powerstroke and duramax.

 

[Greenleaf]

There is a fellow on the First Gen board who bored his engine. I forget now what the new dimentions are. He also posted the different OS pistons available..... maybe he is full of it. Do I care>>>>?



The reason MOST don't mess round with pulling the engine to overbore is cuz for one you have to pull the block. Another, is the simple reason to produce more power, you simply add more fuel and more oxygen.

 

[TKingsbury]

Thick cylinder walls are what you want for making power, so just boring would not be a good idea as a means of increasing displacement. The small displacement increase isn't worth the loss of material. I would only do it as needed in a rebuild/repair. Stroking on the otherhand would be good. I think there are 2 primary reasons you don't see it done (at least on cummins pick-ups). You can already make tons of power with stock displacement, and the engines seemingly last forever. Why go to all of the work and expense of a complete overhaul/modification on something that doesn't need it to make good power.

Travis. .

 

[ThrottleJockey]

Travis...





Because it would be COOL!!!

 

[WStephens]

When I looked on the Cummins web site they said that the new 6. 7 was not the same as the European 6. 7. the European was a stroked version of the 5. 9 but the new 6. 7 was both bored and stroked for the US market.