1967 M715 "Project Jungle Rot"

[tndonor]

Here is the 1410 yoke next to a can and 1350 or 1330 yoke. These things are massive!

[tndonor]

Here is the HT3B turbo (atmospheric turbo) for the compounds.....its pretty big. Those are my car keys next to it and a coffee cup for reference.

[tndonor]

Front of the truck is stripped

[tndonor]

Currently the truck has the Cummins sitting in the bay with supports. The motor mounts are being finished.

Other plans/items I have
325/85/16 Michelin XMLs (have)
16x10 wheels (undecided....leaning towards black rock)
Hi steer/crossover with Heims (have)
Winch (undecided on type and manufacturer )
On Borad Air (leaning torwards the Warn VTC or Oasis)
Hydoboost...Thanks Elliott!!!!!!!

Work keeps me mired most of the time but Ill update as I can.

Let the comments fly goo, bad, or ugly

[Headhoncho]

Looks like you're singlehandedly going to jumpstart the economy! I guess you'll be recieving lots of Christmas cards this year.

Looks great so far but why did you inboard the rear springs to inside the frame and not under it?


JR

[tndonor]

It feels like I have done my part to stimulate the economy haha. I inboarded to the springs for better articulation (thats my hunch) but mainly to keep down on lift. The 715s will clear a 38 inch tire stock. If I inlined the springs with a spring over, it would be huge and be large enough for a 46 or 49 I imagine). Spring over is the only option for what I want. Spring unders have their place, just not for this build.

Cant have the springs digging in the dirt when I show up at the tractor pulls either!!!

[newtojeeps]

Are you going to rust proof the frame? You have only to remove the cab and take it for a galvi dip before paint and under coat. Or are you waiting to finish fabbing motor , tranfer case, and spring perches. At any rate have fun.

[Gambler68]

Whoah...nice job.

What did the 14b come out of? What do you think you have into it to convert to disc? Would it still be wide enough with outboard springs? Check my build link and you'll see why I ask. TIA!

[tndonor]

I will be taking the cab off when all the mounts and crossmembers are complete. It will be getting a rust treatment/barrier applied. Kinda silly not to when its down that far. Only four bolts from the cab comming off.

[jMedia]

Are you using the ht3b as your only turbo or doing a twin turbo setup? Just looked into the ht3b and people are saying it takes a lot of fuel to get it spinning if it is your only one

[tndonor]

Gambler,

From what I recall, you must use a van width 14bolt to use outbaord springs. There are rare as far as 14 bolts go. Even still, the space between drum and spring is close.

The 14 bolt is from a CUCV. the disc brake brackets are about 50 bucks from several people. Rotors and hardware are another 150 or so new (or at least for me at NAPA).

[tndonor]

Are you using the ht3b as your only turbo or doing a twin turbo setup? Just looked into the ht3b and people are saying it takes a lot of fuel to get it spinning if it is your only one

HT3B is the large turbo in the compound setup (commonly are somewhat incorrectly referred to as twins). The stock hx35 and HT3B will work together. It has the 26cm housing. It would be very difficult to spool as a single. It would take lots of fuel and lots of RPMs to acheive that. Theses turbos come off of big rigs for reference.

Twins, one turbo for each bank
Compounds, small turbo exhaust fed into larger turbo, large turbo compressed air fed into small turbo, small turbo connected to intercooler/motor.

[Gambler68]

Gambler,

From what I recall, you must use a van width 14bolt to use outbaord springs. There are rare as far as 14 bolts go. Even still, the space between drum and spring is close.

The 14 bolt is from a CUCV. the disc brake brackets are about 50 bucks from several people. Rotors and hardware are another 150 or so new (or at least for me at NAPA).

Cool, thanks!

[jMedia]

HT3B is the large turbo in the compound setup (commonly are somewhat incorrectly referred to as twins). The stock hx35 and HT3B will work together. It has the 26cm housing. It would be very difficult to spool as a single. It would take lots of fuel and lots of RPMs to acheive that. Theses turbos come off of big rigs for reference.

Twins, one turbo for each bank
Compounds, small turbo exhaust fed into larger turbo, large turbo compressed air fed into small turbo, small turbo connected to intercooler/motor.

Oh ok I see, I missed that. Since the small turbo is feeding the large, will it still take a while to spool both up? Whats the advantage of compound turbos vs twin?
Sorry for flooding your thread with ?s

[iroc86]

Looks like a really cool project. I like your plate/sleeve spring hanger idea -- I used the same method to drill holes through the frame of my YJ and it made life a lot easier.

It will be neat to follow this thread. You're building what a modern M715 should be.

jMedia, compound turbocharger setups are popular on diesel engines because you're usually working with a single bank of cylinders (inline configuration), making twin turbos inappropriate. Compound turbos allow you to produce much higher intake pressure than a single turbo -- the turbo sizes are matched to their respective operating ranges. The smaller turbo spools up faster, so it receives exhaust pressure first. However, since it's a smaller unit, it can generate a greater pressure (compared to the larger turbo) and is second to receive the intake pressure -- the larger turbo pressurizes the ambient air before it's pressurized again by the smaller turbo.

The operation is very similar to a dual-stage air compressor. A larger primary piston feeds a smaller secondary piston, creating a greater output pressure than a single piston by itself.