Competition 6.7 crank in a 5.9?

[JAmos]

What is the feasibility of putting the 6. 7 crank in a 5. 9? Some specs I saw in a magazine showed the stroke longer as the only difference.



Jordan

 

[biggy238]

I thought that was what the early ag motor 6. 7's were. A 5. 9 with a stroked crank.



However the 6. 7 in the pickups was to be a completely different rotating assembly.

It's been a while since I had access to the specs.

 

[sbentz]

The early ag motors have an even longer stroke than the Dodge 6. 7 and use a 5. 9 bore.

Want to built a big motor? Use a 6. 7 ag crank and a 6. 7 Dodge block. Only issue is the ag crank is a rear gear train.

 

[TCluff]

What is the feasibility of putting the 6. 7 crank in a 5. 9? Some specs I saw in a magazine showed the stroke longer as the only difference.



Jordan

I WAS GOING TO BUILD A STROKER CUMMINS OUT OF MY 5. 9 WITH A 6. 7 CRANK, BUT AFTER TALKING TO A FEW RACE ENG BUILDERS, I DECIDED NOT TO IT BEING A LITTLE WEAKER AT 4500 PLUS RPM... ???

 

[SNiebaum]

the new 6. 7 has both a longer stroke and a larger bore than the 5. 9...

 

[JAmos]

TCluff---You're talking about the concerns of swinging a longer stroke that fast right?

For the hard core 5k rpm and up guys they are prob fine with the normal stroke, but say the engine will stay under 4k almost all of its time, and never go over 5k-it should work great for everyday useable torque. I think that a crank and cam would go well together and give phenomenal torque.



Jordan

 

[MCummings]

The early ag motors have an even longer stroke than the Dodge 6. 7 and use a 5. 9 bore.



Want to built a big motor? Use a 6. 7 ag crank and a 6. 7 Dodge block. Only issue is the ag crank is a rear gear train.

Just turn the crank around LOL



Merrick

 

[biggy238]

Can that really be done without machine work? I've never laid eyes on one of those cranks.

 

[07dodge]

the 6. 7 motor from over seas is i believe is larger bore and then the ag motors are larger stroke. that would make a sweet combo with both together... ... like a 7. 3 inline 6!!!!

 

[biggy238]

Find an IH 466 with a P7100... . It would be really close. I don't know about performance mods though.

 

[TCluff]

TCluff---You're talking about the concerns of swinging a longer stroke that fast right?

For the hard core 5k rpm and up guys they are prob fine with the normal stroke, but say the engine will stay under 4k almost all of its time, and never go over 5k-it should work great for everyday useable torque. I think that a crank and cam would go well together and give phenomenal torque.



Jordan

Yes, as long as it didnt run at much higher than stock rpm with a good harmonic balancer i think it would be fine

 

[KHaines]

Has anyone done it? Where can a guy get a 6. 7 crank? I am doing a CR build up right now. I am game for it if it works, and not to much $$. I'd hate to try it and find issues with it and waste a bunch of time & money.

 

[GMac]

you can get a brand new crank from cummins for 1200 bones. You would also have to get 6. 7 pistons or make a deck plate, or shave the crap out of your pistons if possible so the piston doesn't come out of the bore. I have already looked into doing everything you are talking about but I couldn't justify the money. If you were running a 12 valve head, there is a way to get some pretty big cubes a fairly cheap way but I can't give away all my secrets.

 

[AKaiser]

Find an IH 466 with a P7100... . It would be really close. I don't know about performance mods though.

Don't know that you would need to do much with a DT466 with a P7100. Maybe sticks and turbo setup, plus what transmission would you put behind it? Probably need a Roadranger or a bigger Ally. That's a 7. 6L inline 6 motor, so you're talking gobs more power and torque to start with, and a damn near bulletproof engine to start. It would be kinda big for a pickup, though. When they went electronic, they started having problems with the DT466.

 

[biggy238]

I was just throwing that out there. I personally wouldn't have tried anything with it. someone was just talking about a bigger inline and that came to mind.