Hey guys I'm new here but have a passion for Cummins turbo diesels. I recently acquired a Cummins 12v of unknown year out of an old motergrader. I don't have a truck for it yet but I'd like to start slowly building it for decent power and reliability. It's a short block so i only have the block, crank, pistons, cam, and random misc. valve train parts. Any input would be greatly appreciated i do know that i want it to have a p7100 injector pump but other than that I'm lost at what to do. Also it sat around in a shop for 10+ years not properly covered but the machine work on the block is still good but the cam and crank are slightly rusty covered in crap i was able to polish out the cam with like 1200 or 1800 grit emry cloth but haven't touched the crank yet. I'm getting a little itchy to start playing with it but until I finish this semester I'm broker than a bum.

 

What kind of power are you looking to make?

 

600-700 ft. lbs. or is that unreasonable for stock internals? thank you very much for the reply

 

That is very reasonable and pretty easy to achieve. Stock internals will be plenty strong for that.

 

so where do you think i should start with this build then?

 

Stock internals would be a good start, you can get pretty far on them. For the power you're initially looking for, o-rings and studs probably won't be required, but might be a good idea if at some point you think you'd like to make more power. You can get that number on a stock turbo, but might want to look into something like an hx35/40 hybrid. I would look into at least 3k gov springs, but 4k wouldn't be a bad idea either, you would just need at least 60# exhaust valve springs. As far as fueling, 5x0.012's would probably get you to what you're looking for.

 

thats exactly the kind of direction pointing i needed for turbos and injectors who makes a decent product and where would be the best place to get o head from? and what are orings i mean i know what they are in general but dont know what the diesel term refers to

 

There are a lot of good options for turbos, I run a High Tech Turbo myself, Industrial Injection also makes great turbos and fuel system parts. O-ringed heads you can usually get done at any place that does machine work on diesel heads. Basically what it is, is the machine shop will cut a groove around each "cylinder" in the head and press a steel wire in there. This provides extra clamping force on the headgasket right around the top of the cylinder.