1986 F700 Engine swap
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Cargo Master
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From: Santa Fe Tx
1986 F700 Engine swap
My 1986 F700 has been messed with in the past. It has a 361/391FT when originally it came with a 370/429 Lima engine. I'm wanting to diesel swap it, I was thinking a 6.9/7.3 IDI or a 12v Cummins. Of course I would turbo the 6.9/7.3 I'm not looking for a ton of power or speed, reliability and better MPGS is what I am after. Cost effectiveness would most likely be a 6.9/7.3 anyone else done this swap?
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Cargo Master
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From: Santa Fe Tx
I have a two speed rear, I'm not worried about speed, I'm happy with 55-60mph it's a tow pig not a race car.
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You should figure out your RPM @ MPH points as you may be a 45-50 MPH runner with an oil burner.
I'd go with the 12v Cummins--lots of support for swaps. Bring over a clutch and transmission with it.
If your truck runs, I would consider unloading it and getting something newer with air brakes and a power train you don't have to replace.
I'd go with the 12v Cummins--lots of support for swaps. Bring over a clutch and transmission with it.
If your truck runs, I would consider unloading it and getting something newer with air brakes and a power train you don't have to replace.
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Cargo Master
Joined: Dec 2009
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From: Santa Fe Tx
You should figure out your RPM @ MPH points as you may be a 45-50 MPH runner with an oil burner.
I'd go with the 12v Cummins--lots of support for swaps. Bring over a clutch and transmission with it.
If your truck runs, I would consider unloading it and getting something newer with air brakes and a power train you don't have to replace.
I'd go with the 12v Cummins--lots of support for swaps. Bring over a clutch and transmission with it.
If your truck runs, I would consider unloading it and getting something newer with air brakes and a power train you don't have to replace.
Have you see the price of trucks lately? A diesel f700 that doesn't even run is going for nearly 10k where I'm at. Air brakes area no go for me as well, I'm non CDL ATM and that was and is the beauty of this rig. I don't have to have a CDL on order to drive it. My gas burner limits out at 3500, with either a 12v or a 6.9/7.3 I'll be in good shape. I'm going to go with a 6.9/7.3 for the ease of everything. Make life easier and still accomplish what I want out of it.
Cargo Master
Joined: Dec 2015
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From: Harned, Ky
A 7.3 IDI with a added turbo is still going to be a bit under powered in a truck that size
Peak rpm is around 3200 so you may be able to run 55 on the mat
12 valve Cummins would be my choice of engines but a max 2700 rpm and governor refueling starting a 2400 it’s a 45 mph truck at best without a gear or rear axle change
MD trucks are geared to the engines power band, swapping from gas to diesel generally involves a rear gear swap that is a lot more involved and costly than swapping gears in a light duty pickup
There is no law requiring CDL for air brakes, the CDL requirement is for over 26k lbs commercial use, unfortunately very few MD trucks with less than 26k lb rating were equipped with air brakes
Peak rpm is around 3200 so you may be able to run 55 on the mat
12 valve Cummins would be my choice of engines but a max 2700 rpm and governor refueling starting a 2400 it’s a 45 mph truck at best without a gear or rear axle change
MD trucks are geared to the engines power band, swapping from gas to diesel generally involves a rear gear swap that is a lot more involved and costly than swapping gears in a light duty pickup
There is no law requiring CDL for air brakes, the CDL requirement is for over 26k lbs commercial use, unfortunately very few MD trucks with less than 26k lb rating were equipped with air brakes
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pena2006
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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