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  #81  
Old 10-22-2007, 12:40 PM
FSJeeper FSJeeper is offline
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Location: Texas
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Quote:
Originally Posted by mcinfantry
cool article.

figure >$1500 for a p7100 swap, balance/ blueprint another $1000 or so AT LEAST, and a custom turbo? about $1000. custom air/water aftercooler +700

so if you have a FREE 4bt, then it would cost 4200+ in mods for 350hp. is that "400hp" is easy to get by turning a few screws? a core runs $1500 or so. i THINK i could duplicate this for $6000. a 6bt is cheaper.

i guess technically they turned a few screws.

so what of that is needed for 250hp? im still waiting for an honest answer.

if you only do any ONE, its still more than "a few screws."

Lee, I think you are conservative on your estimate. I would put the blue printing and balancing (if they did it right including shot peening, polishing, and nitriding) at around $2000. I bet that guy has at least $7,500 in that engine. That is not including all of the R&D it took to get it right. How many turbos did it take before he got it right? He could have over $10,000 in it. But, if it is exactly what he wants and his family is not starving because of that engine, I think it is an awesome Bronco.

My diesel gurus tell me that 250 HP is the most you can get out of a 4BT at reasonable costs. From what I am told, you can run stock 6BT injectors and a stock 6BT turbo, have a custom pump built, and buy an intercooler setup and get 250 HP. Thats still going to cost you at least $2000 to get there. Well worth it in my opinion but like you, I have not seen any real world build up or dyno tests to prove it.

I would love to have a 4BT in a Cherokee WT and 250 HP would be more than I would ever need in that application.

I had a 2001 Dodge 6BT with 240 HP and that was enough for heavy towing and my 2004.5 600 series 305 HP 6BT is definitely all I will ever need. This is 100K real world miles, mostly towing and much of it in mountains with sometimes very heavy loads. That torque just eats up those mountain passes. I am very impressed with mine in stock form. I have no desire to modify it, it is fine just like it is.
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In Process: 91 Wagoneer, D61/71 axles with 3.07 gearing, NV4500, NP205. Cummins 6BT.

Back burner project: Crew cab M715, Cummins/Allison/Rockwell Tcase/Dana 61/Dana 71.
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  #82  
Old 11-13-2007, 10:27 PM
bigcoupee bigcoupee is offline
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Join Date: Nov 13, 2007
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I only need 130 diesel hp in my jeep and I'll be very happy. No matter how much you tune up a 4bt jeep it won't win any drag races. Thats why I have a sportscar and a jeep. The reason we are choosing the 4bt is for the great low end torque, excellent fuel mileage and unmatched reliability. Why rune that? Lets talk more about the install technicallities instead. Just my 2 cents.
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  #83  
Old 11-14-2007, 08:55 AM
FSJeeper FSJeeper is offline
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Quote:
Originally Posted by tndonor
Vibration...... Im not roadworthy yet. HOWEVER....there is some vibes on startup and shutdown. I rode in an early bronco and it was not noticable compared to a healthy V8. There are many fctors there....isolation mounts....weight of the vehicle. I am heavy enough, it is a not an issue. I am also using a 4B that is internally balanced, with fluid isolation mounts, with a hefty weight.

Man, I am really enjoying watching your project come together. Your truck looks fantastic.

I have heard about externally balanced 4BT's but not an internally balanced unit. Can you tell me more about this?
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In Process: 91 Wagoneer, D61/71 axles with 3.07 gearing, NV4500, NP205. Cummins 6BT.

Back burner project: Crew cab M715, Cummins/Allison/Rockwell Tcase/Dana 61/Dana 71.
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  #84  
Old 11-14-2007, 10:59 AM
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Mikel Mikel is offline
 
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Location: New Haven, CT
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Regarding shutdown vibrations:

When I bought my breadvan, when shutting the 4BT off, it shook the van VIOLENTLY. I haven't driven my truck, but I've started the engine a few times and the shut-off shaking is nowhere as bad as I was expecting. I wonder if the harmonics of the J300 are different from the step van
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  #85  
Old 11-14-2007, 11:17 AM
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The PIG Smith The PIG Smith is offline
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Location: Fort Wayne, Indiana
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Quote:
Originally Posted by FSJeeper
Man, I am really enjoying watching your project come together. Your truck looks fantastic.

I have heard about externally balanced 4BT's but not an internally balanced unit. Can you tell me more about this?
I spoke about the internally balancer in your post:
Cummins 4 cylinder ISB
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2005 Grand Cherokee Limited - HEMI! Current Daily Driver
1982 J10: Current Project, goal to be roadworthy in 2017: No Cab Brow!
1981 J20: Commercial flat bed. Long term Project: RUST! No Cab Brow!

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...but if it works, I wouldn't touch it.
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  #86  
Old 11-24-2007, 07:45 PM
tndonor tndonor is offline
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power update.

Well performance delivery valves, stage II injectors, fuel plate modifications have been done. Now the turbo is too small. I hit low 30s on the boost gauge and its all the turbo will give me. I have a larger turbo lined up for installation! Shooting for 50 psi and some timing changes.,

Nothing like blowing traffic away without downshifting! This thing really scoots! If I can get some video, Ill post it.
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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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  #87  
Old 11-24-2007, 11:13 PM
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jepj2000 jepj2000 is offline
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Quote:
Originally Posted by tndonor
Well performance delivery valves, stage II injectors, fuel plate modifications have been done. Now the turbo is too small. I hit low 30s on the boost gauge and its all the turbo will give me. I have a larger turbo lined up for installation! Shooting for 50 psi and some timing changes.,

Nothing like blowing traffic away without downshifting! This thing really scoots! If I can get some video, Ill post it.

I think video is going to be a must! Hell I would even take some more pics of your sweet machine!

Rankin
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1977 J10: 401, TH400, Quadratrac, partime kit, Dana 60's , 4.10s, welded rear, RS44044s SOA, 63" Springs inboarded, 36" Goodyear RT IIs

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  #88  
Old 12-21-2007, 12:59 PM
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dusty dusty is offline
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Quote:
Originally Posted by tndonor
Well performance delivery valves, stage II injectors, fuel plate modifications have been done. Now the turbo is too small. I hit low 30s on the boost gauge and its all the turbo will give me. I have a larger turbo lined up for installation! Shooting for 50 psi and some timing changes.,

Nothing like blowing traffic away without downshifting! This thing really scoots! If I can get some video, Ill post it.

head studs will be in order between 45-50 psi these things like to stretcht he stock bolts. pressure isn not always an indication of power it can also be an indicator of na inbalance... drive pressure ratio or over boosting . an hx35 is only efficient to 34-36 psi but can push 40-45 psi not safely but it will do it. A S300 with a small 12 cm exhaust housing and 62mm inducer will be efficient to 40-45 psi. food for thought


What CPL number is that engine originally? what year motor?

thanks

BTW can i get a couple of close shots emailed to me of the hydraulic master cylinder at the fire wall and under hte dash at the pedals. im going to try and keep stock jeep pedals and retrofit to use a late model dodge or chevy master cylinder but was interested in seeing how much travel your setup has.

Did you use flared fittings on the PS pump and hydoboost or O-ring?

Cheers
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  #89  
Old 02-22-2008, 04:35 PM
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SteelHorse SteelHorse is offline
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tndonor - could you snap some pics of the intercooler setup?

i'm searching for an intercooler for my 4bt swap and i'm curious how you fit yours in there. i've got the rhino grille as well so i don't want to hack away too much metal on the grille frame.
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  #90  
Old 09-11-2010, 04:03 AM
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Tigger4X Tigger4X is offline
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I know, I know ... HOLY OLD THREADS! Its been 2 1/2 years since the last post, but I'm not seeing the end of the story. Can you fill in the details for me?

I'm contemplating the 4BT w/ATA ... NV4500 ... doubler? ... 60/14 ... 3.73s ... 36" shoes. But havent ruled out the 6BT. Longevity and MPGs are king, I'd like to be able to have uphill passing power and be able to do occasional towing without suffering too bad.

What I'm hearing is very enlightening and I'd really like to become well versed in the smokey side of life.
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Last edited by Tigger4X : 09-11-2010 at 04:08 AM.
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  #91  
Old 09-11-2010, 11:02 AM
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glady8r glady8r is offline
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Im a little jelous of that truck.ok ok Im alot jelous! should get a matching bed the old ones with round tail lights and chains.NICE none the less thanks for posting it
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  #92  
Old 09-15-2010, 03:48 PM
tndonor tndonor is offline
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The end of the story is either sad or happy depending. I parted the truck out about 2 years ago. The project was more a less a whim when I got the 4B. I got hooked.

My first and only true love is the M715. I was already thinking of a second project. Once I did some research on the differences, I opted to do a dreambuild with the help of a friend who does this for a living.

I learned much about the Cummins B series, Jeeps, Fab work,etc. It seemed to be a good jumping platform to build the truck. I envision a truck I can do most anything with and do it respectable (wheeling, interstate driving, OBA, OBW, recovery, etc). Well see how it pans out
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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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  #93  
Old 10-14-2010, 04:58 PM
conehead conehead is offline
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Join Date: Apr 24, 2006
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I know this is a little late but do you know what those outside mirrors can from?
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  #94  
Old 10-27-2010, 06:44 PM
CrewCab59 CrewCab59 is offline
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Quote:
Originally Posted by conehead
I know this is a little late but do you know what those outside mirrors can from?


They are mid 80's and up GM Truck ,Blazer and Burb.
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