Just wondering how far the 5.9 could be bored and stroked if Dodge decided to pursue that route. What the most cubes (or liters) it is safely capable of ?

 

I have never heard of boring out a Diesel... To get more air just use a bigger turbo. I have wondered if they will be bong to a variable vane design like the 6.D0A...

I don't really see Cummins changing the block, as they haven't changed it signifacntly in the past 40 years... If it aint broke don't fix it.

 

From what I understand, the current Cummins doesn't use variable vane like the 6.0, Cummins uses something way less complex to accomplish the same thing. Something like the housing can vary in length (or was it throttling the opening?) to achieve basically the same thing. It winds up giving the engine the better characteristics of smaller and larger housings. A smaller housing for a quicker spool from idle and a larger housing to maximum boost.

Something like that, is what I thought I has read. And, I've also read that there is a 6.7L I-6 Cummins which is basically a stroked 5.9L. Don't know if any of this is really true, I've not done the homework myself. Greater minds will speak up.

- JyRO

 

I've heard that there is a 6.7L sized engine and they are in some agricultural applications. My dad says he saw one at the harrisburg farm show in a tractor.
I can't say if its the same block or not, but I remember him telling me that.

 

The 6.7L is a Structural Block...meaning it is designed as the front frame of a tractor, and weighs about 1400lbs. I can't see Dodge using this in an already VERY front heavy truck.

It is also a rear gearcase design. Cam and pump drive from the back of the engine so a tractor can turn tighter.

I also don't believe that Cummins make a NON-Structural block 6.7L. It is, however, the same bore, but a 1/4" longer stroke than a 5.9L...meaning I don't know it the 5.9L block could handle that rotating assembly or not

Chris

 

Its the variable GEOMETRY turbo. It uses a sliding cone to expand and constrict the exhaust outlet to help spool up faster. The variable vane uses a bunch of moving parts to move the exhaust vanes. Lots more parts to break inside them.

 

I never knew that Cummins was using a newer design than the HX on mine...

They start that on the third gen's?

Bong in my first post should have been be going... and evidentaly they have already gone to a more advanced turbo design to aid on spool up...

 

not yet.. the holset design vgt works pretty well [maybe not quite as efficent as the garrett vnt, but MUCH simpler].

there is a video clip on the cummins website somewhere that shows the operation of the VGT turbocharger [along with their egr system ]

i don't have it bookmarked on this pc, but i will give a quick search for it..

*****

found link... click here

 

There is a non structural block 6.7 Cummins, got one going in a school bus now for field testing. and the acc. drives are on the rear of the engine.