The Cummins Bronco - Page 2 - Ford Bronco Forum
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post #21 of 235 (permalink) Old 08-13-2010, 01:49 AM
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Quote:
Originally Posted by Nates78 View Post
You have mad skills.....
He haz madz skillz yo!


No seriously, that is so awesome! Makes me wanna a diesel! :P

Great build with pics too!

1996 Ford Bronco Eddie Bauer 5.8/E4OD EFI
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1979 Ford F-150 Custom 5.0/4speed
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post #22 of 235 (permalink) Old 08-13-2010, 04:29 AM
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Damn! That is Sweet....
Don't like much dodge stuff, and ain't in any way a diesel fan outside of semi trucks,
but man, that is too freakin' cool... Great conversion.

What are the torque/HP ratings on that motor?

G.

*'78 Bronco XLT, Half-cab conversion , 400-C6-205,4.10s, 33"s 6MPG
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post #23 of 235 (permalink) Old 08-13-2010, 10:21 AM Thread Starter
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I haven't taken it to the chassis dyno, but from reading up on the Cummins websites, with the mods I've done, it should be around 260hp and 650 ft/lbs of torque, give or take 10%.

I've been driving heavy trucks for a living on and off since '86, and in fact, just hit my millionth mile in the summer of '09, so I'm right at home with a diesel under me. I wouldn't trade diesel power for anything..

p.s. I'm not a big fan of dodges, either, although I certainly would take a Dodge with Cummins power over a GM with an Isuzu maxipad diesel any day, but Cummins is a separate entity, and they make pretty awesome motors. Especially the old all-mechanical models. In fact, the bigger Ford F series heavy trucks have Cummins in them, too.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #24 of 235 (permalink) Old 08-13-2010, 10:27 AM
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My next diesel will be an inline6 as well... (just has more of an oval stamp on the valve cover.....) found ways to have other people "sponsor" this one, need to find ways to get it sponsored as well. Sweet pony.

All purpose rig under construction.. stay tuned!
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post #25 of 235 (permalink) Old 08-13-2010, 10:39 AM Thread Starter
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A big reason I like the Cummins is that inline configuration.. Lots of room to work in an engine bay makes me happy. Another reason I like the inline is because it has a 4.72" stroke, and is partly responsible for the torque peaking at 1600 rpm.
N3SKALYN likes this.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #26 of 235 (permalink) Old 08-13-2010, 10:48 AM
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that made me research, apparently my motor is squared... 4.4" x 4.4" bore and stroke

All purpose rig under construction.. stay tuned!
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post #27 of 235 (permalink) Old 08-13-2010, 12:04 PM
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Great conversion! The ultimate Bronco

Sweet Old Bob!
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post #28 of 235 (permalink) Old 08-13-2010, 01:39 PM
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All I've got to say is...that's frickin awesome...and I'm not even a diesel fan. I can 100% appreciate the time, effort and work that went in to making that rig. Great work man.



Ben
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post #29 of 235 (permalink) Old 08-13-2010, 02:33 PM
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post #30 of 235 (permalink) Old 08-13-2010, 03:25 PM
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Great work! That thing is awesome!

How much $ do you think the engine conversion process cost (not including the negative $200 engine (lucky dog!))? -Adapters, motor mounts, C6 controller, radiator mods, hoses and little stuff, etc.

1977 Ford F-150, 460, Autofab motor mounts, L&L Shorty's, L&L brackets, Comp Cams Xtreme Energy 4x4. C6, Detroit Locker, 4" lift, 35" Goodyear MTRs
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post #31 of 235 (permalink) Old 08-13-2010, 04:08 PM Thread Starter
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After driving the truck for a couple weeks, I thought the rear was shot. It had excessive play and then it would bind when I'd turn corners under power. Imagine my surprise when I took it apart and found a brand new Detroit Locker carrier inside?? Since this is my daily driver, I didn't want the Locker tearing up my tires and causing havoc back there during everyday street use, so I swapped in a low mileage peg leg chunk I had. So now I'm not sure if I want to install an air locker set up, or clutch type diff.. hmmm What's a good asking price for a *very* low mileage 31 spline Locker? It looks like the only mileage on it was the 2 weeks I drove it.

The engine mounts were $250, the adapter and flexplate was $1400, the VRV valve from Ford was $115, radiator mods cost $75, the custom built C6 with billet 1200 rpm converter from Dynamic Transmissions was $1600. There was a million odds and ends too, and lots of trips to Napa for the small stuff.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #32 of 235 (permalink) Old 08-13-2010, 04:20 PM
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I don't know what everybody else would pay, but I paid 400 for an almost new Detroit, pumpkin, and 411's. I use mine for daily driving and I don't have a problem with the locker. I am just easy around the corners and keep good rotation.
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post #33 of 235 (permalink) Old 08-13-2010, 04:24 PM
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very cool, nice to see i'm not the only one who thinks a cummins and a Bronco are a perfect match!!

what gears are you running?

i can't imagine mine without overdrive.

1978 ford bronco
Cummins powered!!!
one tonned
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post #34 of 235 (permalink) Old 08-13-2010, 04:45 PM Thread Starter
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I'm running 3.50 gears. With the 35s on it, it does 55 mph at 2000 rpm. I want to go with 3.00 gears, but they're not available for the high pinion front D44. Maybe I'll get bigger tires to improve my fuel mileage. Sounds like a good excuse to me!

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #35 of 235 (permalink) Old 08-13-2010, 05:28 PM
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yeah i am thinking 3.55 s might be perfect with my 35s and overdrive, i just don't like to rev the bag off of it on the highway all the time.

1978 ford bronco
Cummins powered!!!
one tonned
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post #36 of 235 (permalink) Old 08-13-2010, 06:37 PM Thread Starter
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Assuming that's a .72 overdrive, with 35s and 3.55s, you're looking at 55 mph at 1350 rpm. That would be ideal for a Cummins.
I've thought about a built E4OD with lock up converter and standalone computer, because I would love the overdrive. But with my motor sitting back 4" in the chassis, there isn't much room for that extra transmission length. The rear driveshaft would have a hideous angle on it. Plus, the computer alone is $1000, then those E4ODs are at least 2500-3000 to build for the diesel.
I don't know if an AOD could be built to stand up to the torque, but that might be an option for me, too.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #37 of 235 (permalink) Old 08-13-2010, 07:46 PM
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amazing build i rember i used to wanna drop a powerstroke in a bronco and seems the cummins is the way to go.... and as far as i remember cummins is owned or a subsidiary of ford
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post #38 of 235 (permalink) Old 08-13-2010, 09:26 PM Thread Starter
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Well, at one time, Ford did own 19% of Cummins, but back in the early 90s, they sold off all their stock. Cummins today is owned only by Cummins. But as I mentioned before, the Ford heavy trucks still come with Cummins in them.

1978 Bronco Custom, 6" skyjacker & 3" body lift, 37x12.50R16.5s, posi front diff, 3.50 gears, Dynamic Racing C6 w/billet 1200 rpm converter, upgraded brakes, '91 Cummins 12V, Denny T fuel pin, injection pump maxed out & timing advanced, 3800 gov. spring, 60# valve springs, ARP head studs, 4" exhaust.
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post #39 of 235 (permalink) Old 08-14-2010, 12:27 AM
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I have a Detroit locker & no issues with using up tires.

Quote:
Originally Posted by InfoFord View Post
if you still can't figure it out put it back together and take it to a mechanic
"Under my plan electricity prices would necessarily skyrocket" BHO

Truck was stolen & sold for parts Wheat Ridge Colo Black with Red 2 tone. About $20K in the truck. VIN U15HLEC0170
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post #40 of 235 (permalink) Old 08-14-2010, 12:40 AM
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Fantastic build.

How would things have gone without the 3 inch body lift? Could be done or no?

Quote:
Originally Posted by InfoFord View Post
if you still can't figure it out put it back together and take it to a mechanic
"Under my plan electricity prices would necessarily skyrocket" BHO

Truck was stolen & sold for parts Wheat Ridge Colo Black with Red 2 tone. About $20K in the truck. VIN U15HLEC0170
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