4BTA cummins in my J10

[tndonor]

Been awhile since Ive posted anything. For the short version. Bought my truck of the bay. Brought it home and did body and paint. Previous owner put a 6.2, TH400, divorced NP205. Also threw in dana 60s front and rear.

Bought a Cummins 4bta and phase two started. Also bought new NV4500 (chevy with dodge input to avoid 5th gear nut prob) and dana 300. I kept the np205 so I now have a doubler with a stub shaft between the D300 and NP205.

6.2 threw a rod on the way to its motor swap.....irony? I would swear the 6.2 makes more power with a cracked block and hole in the oil pan. Anyway, its almost done. Have to run battery/alternator connections, connect fuel lines, and mount clutch pedal.

ENJOY!

[tndonor]

[tndonor]

Motor with newly installed south bend clutch

[tndonor]

[tndonor]

Shot of underside. NV4500 to D300 to NP205

[tndonor]

[tndonor]

looks like NV4500s were meant to live in these trucks!

[tndonor]

Here are a few body pics if you didnt catch the first installment

[tndonor]

In case there are any wandering minds.....

hydroboost
delco 21si alternator 180 amp
pyro, boost, alternator, water, oil guages
recentered hummer wheels to come soon
paint is gunmetal metallic
'67 badging to match the grille (it denotes a 327. When I would fuel up at the diesel, people would hear the 6.2, and ask if it were a diesel and did I know I was fueling diesel and not gas. I replied that I had a 327 and ran across some 16 to 1 racing pistons and run those to burn diesel for more power and fuel economy! I plan to resume that)
diamond plate door panels to be done later this week
t max winch after I get taxes done

[J10Mike]

Holy Mother of Pearl...How sweet is that??? Where did that front bumper come from?

[willam]

You are my new hero. I love these diesel conversions. At the risk of offending, or sounding stupid, why the 4BT? Was this a monetary decision or is there something about the 6BT that make that conversion a giant PITA. I know those 4BT's rock as a transplant into Lil' Jeep and scout 80's, but I would have though a six would be the choice for a large J truck.

Don't get me wrong, it's awesome and given the choice between a gas guzzling jtruck or a diesel rig w a 4BT the answer would be..diesel. Anyone who has the resources a brains to tackle something like this gets my home-school engineer of the year award. your an inspiration. good luck with the rest of it.

[tndonor]

The front bumper is a BJs Offroad prototype they mocked up and sold here on the board I believe.

As for why the 4bt and what it is. The 4B is just like the 6B minus two cylinders.

One is the overall legnth of the 6B. It puts the rear valve cover and injection lines way back there and would probably involve partially taking the motor out for some basic service. Also running an air to air aftercooler and taurus electric fans so length was critical.

Two is fuel mileage. Most people are reporting about 25-30 miles per gallon versus 17ish for the 6b. My 4B has the coveted P7100 injection pump, not the rotary. Nothing wrong with the rotary.

From the factory, my 4b was spec'd at 350 ft lbs at 1300 rpm. I have a larger turbo, put the air to air and turned the fuel fuel up one revolution. I should be at 425-450 tq now. I also had a 3200 governor spring kit installed to get the rpms up if I am towing a load and need to keep i the power band.

And for gearing. The axles are 4.10, NV4500 5.6 to one first, Dana 300 2.6, Np 205 1.96 for a grand total of...........................119to 1

[jepj2000]

Man that is a great lookin Jtruck! I wish I had a diesel converted one so bad. Can't wait to see the final thing with the engine and hummer wheels and what ever else you may do.

Rankin

[tndonor]

Thanks for the nods. There are several things Id like to do but the wife is going back to school. But when she is out.......

Auxillary fuel tanks........air horns......bigger injectors........

[jeepmj_tj]

what are doing for a clutch pedal and hydraulic lines?

I hope to have my 6bt running in my 79 J20 by the end of the month. Although it will not look as good as yours as I wont be able to have it painted for a while..

92 12valve, nv4500, d70 rear, H2 wheels/tires.

[tndonor]

Since the Jeep had hydroboost already, I got a clutch pedal set up for the hydroboost.

[etjeep]

Nice Job!

[jeepmj_tj]

Originally Posted by tndonor

Since the Jeep had hydroboost already, I got a clutch pedal set up for the hydroboost. Then bought a new master cylinder for an 86 F350 and hydraulic line. Take the o ring off the end of the ford line, install the dodge o ring and it plugs directly into the dodge slave cylinder. All for about 100 bucks......three hundred cheaper than the Dodge setup!

what do you mean clutch pedal setup for the hydroboost? do you have any pictures of the clutch pedal and of the MC installed on the firewall?

thanks..

[tndonor]

I bought a set of gm manual -pedals from a hydroboost truck. Ill get some pics up, may take a few days between work and me driving to where the truck is.

All that is left to do is get the pedals adjusted and lines bled. Run battery/alt cables. Put hose clamps on the fuel lines and start cranking. Im hesitant about putting the interior together until the bugs are gone.

Jeepmj tj......my buddys family has a place on Keowee.....When we head down for trips this summer Ill let ya know in case we want to drool over our trucks

[crazydog]

Originally Posted by tndonor

The front bumper is a BJs Offroad prototype they mocked up and sold here on the board I believe.

As for why the 4bt and what it is. The 4B is just like the 6B minus two cylinders.

One is the overall legnth of the 6B. It puts the rear valve cover and injection lines way back there and would probably involve partially taking the motor out for some basic service. Also running an air to air aftercooler and taurus electric fans so length was critical.

Two is fuel mileage. Most people are reporting about 25-30 miles per gallon versus 17ish for the 6b. My 4B has the coveted P7100 injection pump, not the rotary. Nothing wrong with the rotary.

From the factory, my 4b was spec'd at 350 ft lbs at 1300 rpm. I have a larger turbo, put the air to air and turned the fuel fuel up one revolution. I should be at 425-450 tq now. I also had a 3200 governor spring kit installed to get the rpms up if I am towing a load and need to keep i the power band.

And for gearing. The axles are 4.10, NV4500 5.6 to one first, Dana 300 2.6, Np 205 1.96 for a grand total of...........................119to 1

Finally a 4BT conversion where someone uses an aftercooler!!! Are you using a factory aftercooler from a Dodge or f*rd application, or something else or custom? Are you using the stock fuel plate? If you are you might try contacting TST and see if they have tried any plates on a 4BT.