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  #61  
Old 12-13-2010, 12:54 PM
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Bill Moore Bill Moore is offline
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Location: Alabama
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Quote:
Originally Posted by Mikel
Bill,
What have you done to your 4BT? What are the specs? I would consider spending some time and a few $$ on that engine before pulling it. I believe a 4BT makes for a very balanced engine in a M715, in terms of weight, power, economy and durability. A 6BT kinda pushes the envelope a bit, but it all depends on what you want the vehicle to do.
Mikel

4bt is essentially stock, running nv4500 tranny, np 205 divorced TC, and cucv stock axles with 39 inch tires.
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67 KJ715 4bt AA OD 465 np205
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  #62  
Old 12-13-2010, 01:12 PM
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Mikel Mikel is offline
 
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Quote:
Originally Posted by Bill Moore
4bt is essentially stock, running nv4500 tranny, np 205 divorced TC, and cucv stock axles with 39 inch tires.

Then it's no wonder you don't have much reserve power. 105HP is 105HP regardless of how much torque you might have. If you aren't a member there, join the www.4btswaps.com site and you'll find a lot of cheap power upgrades for the engine. Adding a used intercooler, used He351 turbo and injectors will more than double the power and will be far cheaper than swapping engines.

I have a CPL 858, HY35w, 3200rpm spring and have tweaked the pump. Night and day difference! I have driven a stock 1991 Dodge CTD and my truck feels much snappier.

All of these parts can be found pretty cheap used on ebay... I think it's worth a shot before swapping engines.
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  #63  
Old 12-13-2010, 04:05 PM
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Tigger4X Tigger4X is offline
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Quote:
Originally Posted by Mikel
Most people with full size trucks and 4BTs get low to mid 20's. 30MPG claims are either VERY rare or the fruit of bad math skills.


For my quad cab Gladiator I intend to be running with ... NV4500 / Doubler / HD44 & 14 bolt with 4.10 gears and 35" BFG ATs (37" H1 tires for off-road ... I'm gearing for the street & I'll let the t-case handle the off-road needs)

After seeing what was done on Project Humpty I will be running a turbo with an intercooler. I wont be towing a whole lot and when I do I wont be pulling anything like a 30' Airstream or a ski boat so I'm not so concerned there. Once I have that need then I will upgrade to a dually rear and pump up the BTA with heavier springs, turn up the pump, etc. and possibly twin turbos. For now the most I'll be towing is a home grown trailer fabbed out of a J-truck bed.

I'm open to either the 3.9 or 5.9 but bottom line I'm all about the MPGs. So with all that babble out in the open what kinda knowledge can you drop on me?
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Post #14 ~ http://www.ifsja.org/forums/vb/showt...=1#post1580206
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  #64  
Old 12-13-2010, 06:29 PM
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Bill Moore Bill Moore is offline
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definitely worth a look first, thanks
Quote:
Originally Posted by Mikel
Then it's no wonder you don't have much reserve power. 105HP is 105HP regardless of how much torque you might have. If you aren't a member there, join the www.4btswaps.com site and you'll find a lot of cheap power upgrades for the engine. Adding a used intercooler, used He351 turbo and injectors will more than double the power and will be far cheaper than swapping engines.

I have a CPL 858, HY35w, 3200rpm spring and have tweaked the pump. Night and day difference! I have driven a stock 1991 Dodge CTD and my truck feels much snappier.

All of these parts can be found pretty cheap used on ebay... I think it's worth a shot before swapping engines.
__________________
DDs
67 KJ715 4bt AA OD 465 np205
78 J20 Chevy 305 nv4500 np205

Projects

Sons Build 1980 short bed J10, j20 axles, 4bt, nv4500, np205, shortened M715 bed and fenders

Freedom is not Free, it is paid for with Blood
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  #65  
Old 12-13-2010, 07:22 PM
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Mikel Mikel is offline
 
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Quote:
Originally Posted by Tigger4X
For my quad cab Gladiator I intend to be running with ... NV4500 / Doubler / HD44 & 14 bolt with 4.10 gears and 35" BFG ATs (37" H1 tires for off-road ... I'm gearing for the street & I'll let the t-case handle the off-road needs)

After seeing what was done on Project Humpty I will be running a turbo with an intercooler. I wont be towing a whole lot and when I do I wont be pulling anything like a 30' Airstream or a ski boat so I'm not so concerned there. Once I have that need then I will upgrade to a dually rear and pump up the BTA with heavier springs, turn up the pump, etc. and possibly twin turbos. For now the most I'll be towing is a home grown trailer fabbed out of a J-truck bed.

I'm open to either the 3.9 or 5.9 but bottom line I'm all about the MPGs. So with all that babble out in the open what kinda knowledge can you drop on me?


Well, I haven't towed anything really heavy, but judging from the discussions on 4btswaps.com, a 4BT can tow anything, just not at the speeds a larger engine can allow.

If you are going to be doing a lot of heavy towing, a 6BT might be a better option, but if economy is your main concern, a 4 will do fine.

F350s in Brazil are offered with the electronic version of the 4BT...

This is the heaviest I've towed, which is not much.

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  #66  
Old 12-14-2010, 12:15 AM
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Tigger4X Tigger4X is offline
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So what kind of MPGs can BILL MOORE expect with his 3.9L and me with my quad cab Gladiator with a 3.9L in it? Again, for me its all about the MPGs as long as its functional. I dont want to get crazy with it. just intercooled turbo fun.
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Post #14 ~ http://www.ifsja.org/forums/vb/showt...=1#post1580206
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  #67  
Old 12-14-2010, 06:23 AM
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Mikel Mikel is offline
 
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Quote:
Originally Posted by Tigger4X
So what kind of MPGs can BILL MOORE expect with his 3.9L and me with my quad cab Gladiator with a 3.9L in it? Again, for me its all about the MPGs as long as its functional. I dont want to get crazy with it. just intercooled turbo fun.

Like I said, most people with full size trucks and 4BTs that I've seen tend to get mid to low 20's, which is exactly what I've been getting with my J300 (23-24MPG). Considering that I used to get 11MPG with the Buick 350, it is a HUGE improvement.
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  #68  
Old 12-14-2010, 10:49 PM
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Tigger4X Tigger4X is offline
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A 100% increase in MPG is nothing to sneeze at!! I'm wondering if the same can be had from the5.9L? That way there can be extra oompf in reserve.
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Originally Posted by will e
Keep in mind. Getting old is easy. Being old is hard.
Post #14 ~ http://www.ifsja.org/forums/vb/showt...=1#post1580206
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  #69  
Old 12-18-2010, 10:12 AM
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76FSChief 76FSChief is offline
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Just a comment about the 6bt in the Jeep frame. I have my drivetrain mounted in the Jeep frame, and was very surprised to see that the stock springs didnt bottom out right away. With the full weight of the 6bt Getrag tranny and transfer case the frame only dropped an inch or so lower than it did with the 360 in it.

Now dont misinterpret that as me saying go ahead and use the stock springs! Just an interesting point. Was thinking about adding some leaf springs etc before I ordered my Alcan springs.

Happy trails and I cant wait to see more info / pictures of your swaps.
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  #70  
Old 02-03-2011, 09:19 PM
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updates??
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