Competition 5.9 vs 6.7 Parts to check out - Pictures!

[sbentz]

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.

 

[sbentz]

Note that the rod is lighter, has Torx rod bolts, is thinner in the big end width, and has a smaller wrist pin bore. The center to center in a bit longer than a 5. 9...

 

[sbentz]

Next, the piston. Note how short the piston is overall, due to the pin being located higher (shorter compression height) than a 5. 9. It is coated for less scoring, and uses the smaller pin.

 

[sbentz]

Now the crankshaft. It is a rear gear train, like a 5. 9 RV engine. Look Close, and you will see that the rod journal width is narrower. The overall crank is lighter in the forging, and looks pretty neat. there is no front gear to drive anything, just a odd 6 spline ooil pump drive for a front cover mounted oil pump. Again, this is for the structural block, not neccessarily what will be released for the 6. 7 Dodge. Note how much heavier the forging is on the 5. 9. It is the one with the small straight cut gear for the oil pump drive.

 

[sbentz]

Again, until I get more details on the upcoming 6. 7, this is about all I have found out.

 

[bluthndr]

Looks Like it's set up for better geometry and maybe higher RPM(?) - at least, for those wanting it... Kinda sucks that the rods look weaker though.

 

[DieselTweaker]

engine porn..... gotta love it!!







Ack

 

[sbentz]

Looks Like it's set up for better geometry and maybe higher RPM(?) - at least, for those wanting it... Kinda sucks that the rods look weaker though.

I am still struggling with increasing the stroke and not the bore. May drop the peak HP and TQ down a couple hundred. The 409 CU In would be cool instead of 359 CU In.



"She's so fine my 409... "

 

[GWBourne]

less compression = less stress so i understand why the wrist pin and con rod are smaller in some aspects...



from what i hear you can stroke a 5. 9 to something larger, the number escapes my mind right now... but something is telling me it was 6. 7 ... i dunno



the bore on the 5. 9 and 6. 7 are the same... wonder what ya can bore them to... ?

 

[chrleb1]

The agco 6. 7 liter motor is not the same motor at the new 6. 7s coming out. The new ones coming out for the trucks are bored versions, not stroked versions. The bore is supposed to be . 20 - . 25 inches bigger.

 

[fortunate1]

Did I see "MADE IN ITALY" cast into the new piston's side?

 

[Scrappy]

it is supposed to be bored AND stroked from what I heard. The European version 6. 7 is just a stroked 5. 9.

 

[cmonroe]

Chrlebl, a . 250 inch overbore is only 382ci. It will be a 5. 4 inch stroke and a tiny overbore.

 

[COMP461]

Chrlebl, a . 250 inch overbore is only 382ci. It will be a 5. 4 inch stroke and a tiny overbore.

4. 02 stock bore 4. 72 stock stroke

4. 02 + . 250 over = 4. 270

4. 270 x 4. 270 x 4. 72 x 4. 71= 405. 33 cid

get some scuba gear on those pistons

 

[cmonroe]

What kind of math are you doing? PI is 3. 14 man! So here it is if you must know. 4. 020 (bore) x 5. 400 (stroke) x 3. 14 Pi x 6 (the number of cyl) = 409...

 

[Mark_Kendrick]

4. 02 stock bore 4. 72 stock stroke

4. 02 + . 250 over = 4. 270

4. 270 x 4. 270 x 4. 72 x 4. 41 = 405. 33 cid

get some scuba gear on those pistons

What does bore*bore*stroke*4. 41cyls=== way too many beers for Comp461 :-laf:-laf



it should be ((bore/2)^2)*(3. 1415)*(stroke)*(#of cyl)

 

[sbentz]

What kind of math are you doing? PI is 3. 14 man! So here it is if you must know. 4. 020 (bore) x 5. 400 (stroke) x 3. 14 Pi x 6 (the number of cyl) = 409...

Very good math, cmonroe!



I always use Bore x Bore x Stroke x . 785 x numbers of Cyl = CU IN Displacement. That makes 409. 7, but the data tag on the 6. 7 calls out 409. Here is the clip from the QSOL manual.

 

[sbentz]

Did I see "MADE IN ITALY" cast into the new piston's side?

The parts are from ALL OVER the world... .

 

[Steve St.Laurent]

The new 6. 7l in the Dodge application has a bore of 107mm and a stroke of 124mm. I got as much information as possible from the Cummins engineer that was at the intro and it's all in the article that's been on the front page since the day of the intro. I also took pictures from every angle of the mock up engine they had on display (click on any picture for a high resolution version that you can look at closely). https://www.turbodieselregister.com/06ntea/

 

[fest3er]

... a bore of 107mm and a stroke of 124mm. ...

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