D
Deleted member 9101
Guest
The 6x6 rides soooo much better than the 4x4
M1078 LMTV expedition vehicle build
- Thread starter LostInTheWorld
- Start date
Tennmogger
Explorer
For what it's worth, I'm presently on a trip (3000 miles so far) in a '1078. In the same convoy is an M-1083. At last fillup we compared fuel usage after same exact mileage, same driving conditions, road, temp, etc, (well, it's in a convoy!). We had both filled up at the last fuel stop. I needed 20.5 gallons to fill mine. His '1083 needed 45. Differing conditions were my 3116 CAT engine (mechanical), and his CAT C7 electronic engine (heck of a puller), and he didn't need to slow on the hills, and I did.
Based on direct comparison, the 5 ton would cost twice as much to fuel.
The M-1078 rides smooth too.
Bob
Based on direct comparison, the 5 ton would cost twice as much to fuel.
The M-1078 rides smooth too.
Bob
silvrzuki77
explorer
Tenmogger any links or pics? Would love to see them!
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Ozrockrat
Expedition Leader
Injection method (which in a diesel equates to timing and ignition). The 3116 has a mechanical injection pump where as the C7 has injection controlled by computer activating individual injectors (HEUI). The HEUI uses hydraulic oil pressure through individual solenoid controlled to provide high pressure diesel injection into the cylinders.
Probably the main points are. Mechanical = simple, timing may be variable but mechanically controlled, cheap injectors & expensive pumps. Electronic = variable flow and timing of injection, more expensive injectors and still expensive pumps. Electronic does give more bang for the buck and you can modify the "program" to change the HP/torque.
charlieaarons
Explorer
Does the transfer case bolt on to tht Allison? So a 2spd T30 could be attached? That, Detroits, high spd gears and 14.00R20s would make it perfect.
Charlie
Charlie
Ozrockrat
Expedition Leader
The old one has less things to fail. The new one gives more information on condition if you have the ability to read it. Asking that question is a good way to start a brawl in a pub full of earth moving guys.
My preference is the new one. Easier on my old body to diagnose problems and it gives more power for the same displacement. For an expo rig honestly any diesel truck prior to 2006 (USA emissions compliance) except anything actually made by Ford (the International 7.3 is fine) will do the job. Some will just do it quicker up the hills and be able to give you feedback in the cab as to what is happening. Some of the older diesels will just about burn dirt. The electronic injection ones need good clean (very clean) fuel.
The increase to the HP on the 3116 can be done with pump changes and larger injectors for minor improvement and usually a bigger turbo for larger increases. The C7 if you need a reasonable bump its just a code change (more HP may need larger injectors and ultimate power needs a different turbo)
As an example, we used to pull a 50ton dozer on a lowboy using a Diamond T with 24 gears and 140 HP Cummins (140 new but I think a few ponies had escaped over the years). It got us everywhere we had to go but with a top speed of 45 mph (empty of loaded). To get up to speed took every gear/split (no syncro's) and took a long, long time. If someone would of suggested we get the 450 HP 8.3 Cummins with an automatic transmission (Allison only) I would of broken their legs to make sure they couldn't escape with the keys.
On one set of our haul trucks we had the ability to bump them from 450hp to 800hp via gps and a sat link when they got to a mountain range. When they hit the top they were restricted back to 450. That cannot be done with mechanical injection.
My preference is the new one. Easier on my old body to diagnose problems and it gives more power for the same displacement. For an expo rig honestly any diesel truck prior to 2006 (USA emissions compliance) except anything actually made by Ford (the International 7.3 is fine) will do the job. Some will just do it quicker up the hills and be able to give you feedback in the cab as to what is happening. Some of the older diesels will just about burn dirt. The electronic injection ones need good clean (very clean) fuel.
The increase to the HP on the 3116 can be done with pump changes and larger injectors for minor improvement and usually a bigger turbo for larger increases. The C7 if you need a reasonable bump its just a code change (more HP may need larger injectors and ultimate power needs a different turbo)
As an example, we used to pull a 50ton dozer on a lowboy using a Diamond T with 24 gears and 140 HP Cummins (140 new but I think a few ponies had escaped over the years). It got us everywhere we had to go but with a top speed of 45 mph (empty of loaded). To get up to speed took every gear/split (no syncro's) and took a long, long time. If someone would of suggested we get the 450 HP 8.3 Cummins with an automatic transmission (Allison only) I would of broken their legs to make sure they couldn't escape with the keys.
On one set of our haul trucks we had the ability to bump them from 450hp to 800hp via gps and a sat link when they got to a mountain range. When they hit the top they were restricted back to 450. That cannot be done with mechanical injection.
rossvtaylor
Adventurer
X2... That's impressive
vintageracer
To Infinity and Beyond!
subscribed
Coachgeo
Explorer
Yes AWD Tcase bolts to Tranny which is a 3000 model tranny in essence. What else can mount to it in it's place I don't know. But then you got make tranny ECU work with the new Tcase........ That is a whole nother apple. I asked Allison Corp. Tech about this idea of going to a different T-case and his reaction was... very much a "Nottta something to even consider" but he didn't offer advice to why. So I'd sell the Tranny Tcase in it and install a whole different Tranny Tcase combo to your liking that mates with the Pumpkins, the CAT and already has a Tranny ECU that talks to the Tcase mounted to it. The other issue is the CAT ECU talking to the Tranny ECU. Not a problem for the older CAT engine cause it was mechanical and has no ECU. Newer CAT.. different story.
Again there is no lockers available for these axles as of now. Suspect there never will be, but one can hope.
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charlieaarons
Explorer
Meritor's own literature states a NoSpin is optional on the FMTV axles.
Charlie
Charlie
LostInTheWorld
Builder/Traveler
We've had some questions about our frame rail length and general size. All dimensions in inches. Hope this helps some people.
Michael
Coachgeo
Explorer
So far it's been just a ghost.
LostInTheWorld
Builder/Traveler
Nice explanation Ozrockrat. Thanks.
Also, I believe 3116 engine in the M1078 is de-rated a bit. If I remember correctly, it is normally a 311 hp engine that is de-rated to 225 hp in the M1078. I was told it is to extend engine life.
Michael
LostInTheWorld
Builder/Traveler
The transfer case bolts on, but it is huge and fairly integrated into the way the engine mounts. The transfer case is the primary AFT engine support. There are two large plates that bolt onto the sides of the TC and drive load into the frame via large rubber mounts (the front of the engine is supported by two much smaller mounts). I think it would be hard to change out any of it without redesigning the whole drive-train.
Best way to bump the speed up is to swap out the gears in the differentials with a set from an MRAP. People seem to have good luck with the upgrade, but we are planning to leave the drive-train stock for now.
Michael