Cummins N14 650-700hp build

look at cummins oil pressure. cat and detroit make 40+ even at 1000 rpm. cummins don't.

i pull my 11 liter 60 series down to 1200 all the time,and it pulls down there too.

we pulled our 6nz and acerts down low too-i think cat said something like 1050rpm was ok as i recall? we had a company rep come in and talk to our drivers about driving the C15's. we had a few apart,no lower end issues ever found.

 

That is a cummins design, this changed in the early 80s, my 855 never runs under 40psi, it carries the same PSI cold that my 3406B does.

 

Yup cummins are designed as a low oil pressure engine.

 

As I recall my N14 made about 35lbs max,but I quit driving that in '04 so that's subject to fuzzy memory.

 

Yes 35 max. The idea was 35psi at any rpm.

 

I changed an injector in my N14 and fired it up real quick to make sure I got it right before I put it all back together. Never even thought about putting a bolt in the oil passage to the jake. Made a heck of a mess in a heck of a hurry. I used to wonder if they really got enough oil at the lower pressures that Cummins runs. I don't wonder anymore.

 

Blocks cracking? That is a new one, had you said main bearing fretting then that would be true, this is more common with people that lug these engines, drive them like a big cam and there will be no worries about fretting.

I dont have head gasket, crank, or block issues with my BC1 and the N14 block is stronger, and I can assure you my big cam is north of 750 and sees more pressure than any working N14 would ever see.

 

I have a Pittsburgh Power Built N14. It makes 735hp and 2250 torque. That’s plenty for me.

 

What all has been done to it to get that out of it?