Anyone running a 4bt in an obs or brick here?

DragRag · Mar 3, 2012

I am curious as to what kind of real world mileage you would get with it backed by a zf5, or another type of manual trans with overdrive. I am thinking someday I will want to have such a beast if I can average a min of 25 plus mpg. I know they are only like 120hp, I'm not looking for power, I'm looking for economy.

FordGuy100 · Mar 3, 2012

Dont know in a F series truck. I knew a guy back in Oregon who repowered several chevies with them. He had a 4bt in a 90's model half ton suburban with the 4L80E tranny. Said it got high 20's on the highway.

Thatguy · Mar 3, 2012

search for doopy the plow truck

here it is

http://www.oilburners.net/forums/showthread.php?49827-Doopy-the-Plow-Truck-gets-a-Cummins-4BT

jhnlennon · Mar 3, 2012

I think an AVERAGE of 25+ mpg's is optimistic. On the highway I could see it, but not all around average. I know the jeep crowd likes them and have seen alot of postings for mileage in the high 20's and a FEW low thirties. That is in a vehicle that weighs half of what a 3/4 ton pickup does.

92F350CC · Mar 4, 2012

I think some people have put them in burbs and gotten around 25.

TexasLefty · Mar 4, 2012

If you were to intercool it and it was a 2WD 1/2 ton I think you could expect over 25. Thats a great idea just would not tow much.

Exekiel69 · Mar 4, 2012

It all depends on weight and gearing, but You can get 25mpg. I have a stock 4bt on My 10k lbs work van and don't see the need for more power in the city, but moving a billboard on the highway I can still keep up with traffic up to 65mph.

84TD · Mar 4, 2012

Exekiel69 said:
It all depends on weight and gearing, but You can get 25mpg. I have a stock 4bt on My 10k lbs work van and don't see the need for more power in the city, but moving a billboard on the highway I can still keep up with traffic up to 65mph.

any mpg readings?

Exekiel69 · Mar 5, 2012

I haven't checked since the injectors where rebuilt but before this I was getting 17mpg on the highway.

Darrin Tosh · Mar 5, 2012

So far Mine is running like a top! Very good power and fuel mileage. I was getting about 9 with the 30 over 5.0.

However it will be a while until I can get an actual mpg reading on the truck because I need to drop the tank and reseal the sending unit. So right now I cant fill it up, (cause it leaks when I do) put miles on it and fill it up again to check mileage. Hope to have the time to fix that in a week or 2.

GRU · Mar 6, 2012

ive thought about this too. my mechanic friend has a 4b in his commanche and easily got 32+ mpg before turning it up and putting compounds on it. of course he drives like an idiot too. like was said about thats in a light little truck... that has a 6" lift and 33s on it. its also very noisy and rattles EVERYTHING in the cab at various harmonic points in the rpm range.

Black dawg · Mar 6, 2012

a guy I know put a 4bt in a 77 crew that is lifted an sits on 35 or 37 inch tires. He took a trip to Florida and back and got 25mpg and it has power to spare.

82F100SWB · Mar 6, 2012

Comparing mileage figures from jeeps to our trucks is not a good idea, they are aerodynamically stuck in the stone age compared.
A 4B should be good for 30 in a halfton, my 92 Dodge runs 21-23us on the highway.

Anyone running a 4bt in an obs or brick here?

DragRag

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FordGuy100

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Thatguy

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jhnlennon

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92F350CC

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TexasLefty

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Exekiel69

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84TD

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Exekiel69

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Darrin Tosh

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GRU

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Black dawg

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