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  #21  
Old 04-26-2010, 12:49 PM
tndonor tndonor is offline
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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!!!
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #22  
Old 04-26-2010, 01:03 PM
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newtojeeps newtojeeps is offline
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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.
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  #23  
Old 04-26-2010, 01:05 PM
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Gambler68 Gambler68 is offline
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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!
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  #24  
Old 04-26-2010, 01:05 PM
tndonor tndonor is offline
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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.
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #25  
Old 04-26-2010, 01:07 PM
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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
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  #26  
Old 04-26-2010, 01:08 PM
tndonor tndonor is offline
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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).
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #27  
Old 04-26-2010, 01:12 PM
tndonor tndonor is offline
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Quote:
Originally Posted by 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

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.
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #28  
Old 04-26-2010, 01:13 PM
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Gambler68 Gambler68 is offline
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Quote:
Originally Posted by 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).


Cool, thanks!
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1979 Chero S "Sundog" 1979 Chero S "Hammer"
1968 327 J3000 1978 J10SWB
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over.
Hunter S. Thompson .

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  #29  
Old 04-26-2010, 01:25 PM
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jMedia jMedia is offline
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Quote:
Originally Posted by tndonor
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
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  #30  
Old 04-26-2010, 02:01 PM
iroc86 iroc86 is offline
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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.
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  #31  
Old 04-26-2010, 02:17 PM
tndonor tndonor is offline
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Thanks iroc....great summation

Im hoping for about 60 psi of boost. Any more and the HP levels will make me get a twin disc clutch and bigger trans input.....not to say that wont happen soon!
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #32  
Old 04-26-2010, 02:31 PM
Etcetera Etcetera is offline
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Put a fitting in your turbo air piping from turbo to manifold to a check valve and into a tank and you have low pressure on board air.
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  #33  
Old 04-26-2010, 02:59 PM
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mattmopar440 mattmopar440 is offline
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Keep us Updated Looks Great so far
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  #34  
Old 04-27-2010, 07:13 AM
tndonor tndonor is offline
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Quote:
Originally Posted by Etcetera
Put a fitting in your turbo air piping from turbo to manifold to a check valve and into a tank and you have low pressure on board air.

While a novel idea, it will not work for an OBA setup. Exhaust tempteratures are up to 1300 degrees and when that cools (in a tank) the psi will drop as the air cools.

I need the psi and seperate system to inflate tires and run air tools, etc
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #35  
Old 04-27-2010, 07:21 AM
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Mikel Mikel is offline
 
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Quote:
Originally Posted by tndonor
While a novel idea, it will not work for an OBA setup. Exhaust tempteratures are up to 1300 degrees and when that cools (in a tank) the psi will drop as the air cools.

I need the psi and seperate system to inflate tires and run air tools, etc

I think he's talking about the air side. Although you probably won't be going much over 30-40psi, and I'm not sure how useful such low pressure would be.
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  #36  
Old 04-27-2010, 08:30 AM
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Off the hook cool project and being done right!! I'll enjoy watching the progress!
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  #37  
Old 04-27-2010, 08:46 AM
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sportsidedan sportsidedan is offline
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great project... would love those axles on my kaiser...
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  #38  
Old 04-27-2010, 08:58 AM
Etcetera Etcetera is offline
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Quote:
Originally Posted by tndonor
While a novel idea, it will not work for an OBA setup. Exhaust tempteratures are up to 1300 degrees and when that cools (in a tank) the psi will drop as the air cools.

I need the psi and seperate system to inflate tires and run air tools, etc

Yeah, mostly just joking around. Air side.

Cool project.
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  #39  
Old 04-27-2010, 09:36 AM
tndonor tndonor is offline
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No worries.....I joke too often and it is OFTEN taken the wrong way or as fact. Just didnt want to give a "pirate" response......this is a great community and the only way we learn is through others patience and time.

Thanks for the nods

ARP studs for the steering arms are in. LED turn signals for the front (the stock 715 are slits at best, want oncomming traffic to know my intentions because I would roll right over them without much trouble haha) Safety and the safety of others is paramount.

About to send J10 steering box off for a rebuild (unless someone can chime in and say its not difficult). I am going to use a hydraulic pump from a Cummins to push about 12-15 gallons per minute at 1750 psi....that should steer things ok. Debating on a hydraulic winch since I have the capacity.

Line locks are in for trail parking.

Pondering over using cable shifters for the doubler or having three sticks....There are going to be all kinds of levers in the cab nv4500 shifter, OX locker, 3 for the doubler haha.
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1980 J10 4BTA (p pumped) NV4500, d300, np205. Dana 60s Sold and parted out
1967 M715 Cummins 6B p7100
HX35/HT3B compound turbos. NV4500. 203/205 Doubler. 14B FF 4.56 Detroit/ HP60 4.56 OX
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  #40  
Old 04-27-2010, 11:20 AM
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Smiff Smiff is offline
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Great looking project! Where did you find the MRAP seats? They look perfect for a trail rig/DD. I can't wait to do a complete tear down/build up on my GW. It'll probably have to wait until I retire....
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