- Новый двигатель Cummins 4BT 3.9 (4BTA, 4BTAA)
- В комплектации лонг блок двигатель Cummins 4BT 3.9
- Cummins 4BT Engine Jeep Swaps
- Cummins 4BT Engine History
- Engine Specs and Fuel Economy
- Injection Pump Options
- Common 4BT Swap Vehicles
- Cummins 4BT Engines For Sale
- Cummins 4BT Spec
- Engine Data
- Diesel Resource | Your go-to diesel experts
- Comprehensive 3.9L 4BT Cummins Specs
- 3.9L 4BT Cummins Engine Design
- 4BT Reliability
- 4BT Cummins Performance
- Upgrading Performance
- Fuel Economy
- 3.9L 4BT Cummins Engine Specs
- 3.9L 4BT Cummins Engines For Sale
- 1. Craigslist
- 2. Diesel Forums
- 3. 4BTEngines.com
- 4. Ebay
- Can’t Find a 4BT Cummins Engine for Sale?
- 4BT Cummins Engine FAQ
Новый двигатель Cummins 4BT 3.9 (4BTA, 4BTAA)
Наименование: Двигатель Cummins 4BTA 3.9 без навесного
Наличие: В наличии
Цена: от 345 300 ₽
В комплектации лонг блок двигатель Cummins 4BT 3.9
Long block 4BT (длинный блок) — блок цилиндров в сборе с головкой блока
Данный двигатель применяется для многих видов техники и промышленного оборудования, для автомобильной промышленности, строительной техники, дизель-генераторов. Мощность двигателей составляет от 80-и до 130 л.с. атмосферные и с турбокомпрессором.
Мы предлагаем приобрести двигатель Cummins 4BT 3.9 в комплектации Long block (двигатель без навесного оборудования). По желанию заказчика дизельный агрегат может быть укомплектован топливной системой, турбонаддувом и другими деталями необходимыми для замены со старого двигателя. Покупка дизеля 4BT в комплектации лонг блок позволит вам сэкономить время на восстановительные работы и получить гарантию производителя.
| № | Наименование | Модель | Цена | Кол-во | Тип | Наличие |
|---|---|---|---|---|---|---|
| 1 | Long block (двигатель без навесного) — поршень 3926631 | Cummins 4BTA 3.9 | 345 300 ₽ | Брендовый аналог | В наличии |
Другие комплектации двигателя Cummins 4BTA 3.9 под заказ — посмотреть
Модельный ряд двигателей Cummins 4BT
Нм / обороты
Срок доставки: 25 дней (если нет в наличии)
Гарантия: 6 месяцев
Cummins 4BT 3.9 двигатели от 80 до 130 л.с.
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Cummins 4BT Engine Jeep Swaps
Cummins 4BT Engine History
The Cummins 4BT Engine (3.9 L) originally was created for industrial applications. This small diesel made its debut in 1983 as a part of the popular B Series of Cummins Engines. The 4BT was installed primarily in Bread Trucks and Step Vans to haul freight around cities. This is engine should be name Old Reliable because it will run forever. The B50 Life Expectancy before overhaul is roughly 400,000 miles. This engine is known for is reliability as there is no electronic parts on the engine minus the starter and fuel-shut off solenoid. There is no reason this engine won’t run for 1,000,000+ miles. The standard 4BT was produced from 1983-1998. The post 1998 models, known as the ISB 4BTA, are a 16 valve 170 hp 420 lb-ft of torque. These later 4BT were the ECM driven common rail fuel system units typically with the VP Pumps.
The Off-Roading Community began installing Cummins 4BT Engines into Jeeps starting back in the 1980s for four reasons:
- Significant Torque Ratio Upgrade Over Gas Engines
- Biggest Diesel Engine That Will Fit Automotive Applications
- Greater Fuel Economy
- Long Life Expectancy and Room For Performance Upgrades
Engine Specs and Fuel Economy
The Cummins 4BT engine is not known for his raw power only pulling 105 horsepower @ 2,300 rpm however the torque ratio is 265 lb-ft of torque @ 1,600 rpm. With some common performance upgrades this engine will pull 750 lb-ft of torque. Torque is the amount of force all 4 four wheels will produce at the point of contact on the ground. This is important for off-roading as a matter of a few inches is the difference between getting over that incline or ending up in the mud. The standard 4BT will 18-20 mpg in the city and 22-25 mpg on the highway. A normal upgraded engine will yield 28 – 30 mpg with some high level performance mods to the aftercooler, turbo and variable (lift and duration) timing of the camshaft being able to get 35 — 40 mpg.
The VE or VP-14 Rotary Fuel Pump due to its circular cam plate design allows for a constant backpressure of fuel flow allowing for more fuel economy. If you further restrict fuel flow to the VE Pump you will gain greater mpg however within 1 year the pump will fail as too much backpressure on the system wreck the pump. Running some 4.10 gears and some lighter tires are also easy ways to gain fuel economy. Consequently if you want more power out of the VE pump mods kits can get the pump up to 250-300 HP. Note on the other end of the spectrum HP/Torque performance mods can get quite expensive. Full HP mods can include larger injectors, ported heads studs, lower compression pistons, performance cams, harmonic balancers, twin turbos, intercoolers and cold air intakes. Be prepared to pay a great deal of money for something like that.
Injection Pump Options
The standard 4BT uses a P-7100, P-3000 or Bosch A Mechanical Fuel Injection Pump while the later models switched to an electronic VP or VE Pumps. The older mechanical inline pumps are easier to modify and upgrade however you won’t get as good of fuel millage out of them. If you are looking for power definitely go with the P7100 as the it pushes more fuel. You’ll get 500+ HP and 500 ft/lbs of torque with some 2800-3500 RPM governor pins, 550 cc injectors and huge 12-14 mm injector nozzles with the 154 degree spray pattern. This can be done via boring out the injector holes and modifying the overhead with longer stem valves but is not recommended. The 4BTs do not use injector tubes so boring out the injector holes can be done at a machine shop. Note that the bigger the injector nozzles the hotter the head will get and can be prone to cracking. Fuel shops will modify the cam, plungers and barrels, control sleeves, delivery valves and torque cams. We are not modification specialists but know that many mods can be done. The standard injectors on the 4BT are either 7mm or 9mm with 145 degree or 155 degree spray pattern. The downside to P7100 pumps other than fuel economy is that if for any reason the unit breaks a lift pump or has a leak in the fuel line there is no automatic shutoff. Lack of fuel will destroy the pump. With a VE or VP Pump the unit will shut the engine off to save the pump.
Common 4BT Swap Vehicles
The Cummins 4BT Engine can be swapped into almost any 4 x 4 vehicle. Common automotive models include Jeep Wranglers, Jeep Grand Cherokees, Land Rovers, Toyota FJ Cruisers, Toyota 4Runners, Nissan Xterras, Mercedes-Benz G500s, Ford 150s, Ford Raptors, Ford Broncos or Chevy Colorado. The engine is roughly 1/3 of the weight of a Jeep Wrangler so suspension is must when installing this engine. The axles and suspension must also be retrofitted. 1/2 ton axles are a bare minimum for the 800 lbs motor. Dana 44s or Dana 60s are standard differentials in the swap community. For bigger trucks or SUVs the added weight shouldn’t be a huge issue however it is always a smart idea to 
make sure the chassis is balanced and properly holding the addition weight. The most common is a 4BT Jeep Swap. Check out some of the most popular OHV Trails in Colorado once you get 4BT Swap up and running!
Common Jeep Wrangler 4BT Swap Models Include:
- CJ 1976 – 1986
- YJ 1987 – 1995
- TJ 1997 – 2006
- XJ/MJ 1984 – 2001
- KJ/KK 2002 – 2013
- WJ/WK/WK2/ZJ 1993 – 2015
- JK 2007 – Present
Cummins 4BT Engines For Sale
We offer both long blocks and extended long blocks for sale. As a guide an extended long block is about 75% finished. Extended long blocks are ‘component builds’ assembled to specific engine serial numbers and CPLs (critical parts list). As a guide a component build contains 90% OEM parts, 10% aftermarket. Our bread an butter here at Big Bear is replacement industrial assemblies however we recognize the enthusiast market has enjoyed a special relationship to the 4BT. That being said extended long blocks are intended for existing assembly replacement for off-road use only. It is up to you to know your local, state regulations with respect to permitting and emissions testing. Each state and even county is different; it’s best to do your homework before embarking on a vehicle swap. In addition to component built engines we also sell used and remanufactured options.
- 4B Long blocks
- 4BT 105 HP
- 4BA 130 HP
- 4BAA 140 HP
Take a look a some of our previous builds:
Please note that we do not do specialize in 4BT Swaps; we are diesel engine manufacturers and machinists not performance mechanics. If you are a shop specializing in 4BT Swaps let us know and we can ship one of our new component build, used or remanufactured 4BT engines to your facility. Check out some of our installation partners for info on mods and engine installs.
Cummins 4BT Spec
Engine Data
Give us a call today at 844-340-4114 for immediate sales and support for the Cummins 4BT, Cummins 6BT or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!
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Diesel Resource | Your go-to diesel experts
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Written by Kamil
January 3rd, 2021
January 3rd, 2021
Comprehensive 3.9L 4BT Cummins Specs
One of the most common Diesel engines used on diesel conversions is the 3.9L 4BT Inline 4-cylinder Cummins engine. It’s extreme durable like its 6BT relative but it takes up significantly less space. We see a ton of 4BT engines swapped into Jeeps, SUVs, and even cars. In addition to their small size, the 3.9L 4BT Cummins diesel engine offers other advantages as well, such as impressive performance specs and the ability to last hundreds of thousands of miles. They’re also fairly easy to locate!
If you are looking for the perfect Diesel engine to swap into your project vehicle, the 4BT Cummins engine might be the right choice for you. To help our readers decide, we create this post, our comprehensive 3.9L 4BT Cummins Guide. In it, we cover 4BT Cummins engine specs, performance attributes, and where these engines can be found for sale. Let’s get into it!
3.9L 4BT Cummins Engine that is going into a Nissan Patrol GQ SUV in Australia. Find the owner on instagram @AZZBuilt_
3.9L 4BT Cummins Engine Design
The 3.9L 4BT Cummins is a diesel turbocharged engine that utilizes an inline 4-cylinder design. The acronym, 4BT, means four-cylinder, “B” series turbocharged. It shares many of the same components as the 6BT Cummins, the 12-Valve 5.9L Cummins engine found in the 1st Generation Cummins. In fact, if you take away two cylinders you almost have the same engine.
The 4BT engine uses the same pistons, connecting rods, injectors, injection pump and valvetrain as the famous 12V Cummins. Both the engine block and the cylinder head are made of cast iron. This results in a durable foundation capable of withstanding serious abuse. When the 4BT Cummins was released in 1983, it featured 2 valves per cylinder, for a grand total of 8 valves. After 1998, these engines used a four valve per cylinder design, for a total of 16 valves. This is one of the updates that helped second generation 4BTA Cummins engines produce greater performance specs.
The 4BT engine is ideal for engine swaps in smaller vehicles because of its relatively small size. It’s smaller than many V-8 engines commonly used for swaps and offers significantly better fuel efficiency. The 4BT measures in at 30.6″ in length, 24.6″ in width, and 37.7″ in height.
4BT Reliability
Just like the 6BT 12-Valve 5.9L Cummins Engine, the 4BT is rock solid. It is overbuilt, especially for its size. They also last an extremely long time. It’s also essentially service free thanks to the fact that it is gear-driven. Its camshaft, oil pump, injection pump, and accessory drive systems are all gear-driven, meaning there is no timing belt or chain. Early 4BT engines (Pre-1998) also lack electronics, adding to their reliability and simplicity.
4BT Cummins Performance
The 4BT Cummins Engine was originally designed for agricultural, industrial, and light commercial applications. First generation 3.9L 4BT Cummins Diesel engines produce 105 horsepower and 265 lb-ft of torque. Second generation engines, known as 4BTA engines, use 4 valves per cylinder, and produce higher performance numbers. The most common iterations of the 4BTA Cummins Diesel engine produce 170 horsepower and 420 lb-ft of torque.
The 4BT Cummins Engine was way ahead of its time when it was released in the ’80s. It uses direct fuel injection, turbocharging, and an inline-4 design to provide impressive performance specs and fuel efficiency in a tiny package. The only down side of the 4BT is that it runs relatively rough when compared to 6BT engines. This is because the 4BT isn’t balanced, meaning it’s prone to a lot of vibration.
4BT Cummins-powered Jeep Wrangler built by Kyle Martin. You can find him on IG @Kyle_Martin10
Upgrading Performance
While these numbers are a fraction of what the 12V or 24V Cummins engines produce from the factory, these numbers can go up quick! This is especially the case on 4BT engines that utilize a Bosch P7100, or P-Pump fuel injection pump. By modifying the p-pump injection pump, you can get extra horsepower/torque very easily.
You can improve 4BT Cummins performance specs easily because they share many of the same internals as 12V 5.9L Cummins engines. 4BT Cummins engines are frequently used in swaps in which a Diesel engine is added to a vehicle like a Jeep Wrangler or a light-duty pickup truck. In these cases, the engines are often modified for greater than stock performance. There are a ton of 4BT Cummins performance upgrades out there like modified injectors, turbochargers, and others. Aftermarket intercoolers are a must-have as these engines don’t come with one from the factory. Many people also upgrade them for greater durability by using ARP head studs.
Fuel Economy
Cummins diesel engines are known to be fuel efficient by most diesel truck enthusiasts. This engine holds that stereo-type to be true. The combination of this engine’s design, turbocharging, and direct fuel injection make the 4BT very fuel efficient. This is a major reason in why this engine is commonly used in Jeep Wranglers or even old classic cars. It can offer mpg in the high-teens or 20s in many applications.
3.9L 4BT Cummins Engine Specs
| Years: 1st Gen 4BT 2nd Gen 4 BTA | See Below 1983-1997 1998+ |
| Engine Design: | Inline 4-Cylinder Turbo-Diesel |
| Transmissions: | Built with a variety of Flywheel Options to Accommodate a wide variety of applications |
| Displacement: | 3.9 Liters or 239 cubic inches (Ci) |
| Engine Weight: | 750-800 lbs |
| Bore: | 4.02 inches or 102 mm |
| Stroke: | 4.72 inches or 119 mm |
| Cylinder Head: | Cast Iron |
| Engine Block: | Cast Iron |
| Firing Order: | 1-3-4-2 |
| Compression Ratio: | 17.5:1 |
| Fuel Injection: Gen 1 Gen 2 | Originally supplied was a Bosch Mechanical Direct Injection system, using an in-line rotary injection pump. Some engines feature a P7100 Injection Pump, also known as the p-pump. Second Generations of the 4BT use an electronically controlled fuel injection system. |
| Aspiration: | Turbocharged, No Intercooler |
| Valvetrain: | OHV 2 Valves per cylinder (First Gen 4BT) OHV 4 Valves per Cylinder (Second Gen 4BTA) |
| Engine Oil Capacity: | 10 Quarts |
| Fuel: | Diesel |
| Governed Speed: | Varies by Application |
| Horsepower (Varies): | First Gen: 105 Horsepower @ 2,300 Rpm Second Gen (4BTA): 170 Horsepower |
| Torque (Varies): | First Gen: 265 lb-ft @ 1,600 rpm Second Gen (4BTA): 420 lb-ft |
All specs may vary. These engines were used on a vast number of applications so there are plenty of differences in performance and composition.
3.9L 4BT Cummins Engines For Sale
Where is the best Place to find a 4BT Cummins Engine for sale? This is a frequently asked because so many people are after these engines to swap into their project vehicles. Thankfully, because these engines were so widely used there are a ton out there. Unfortunately while there are plenty that exist, many of these engines are old, beaten up, and need some love to get back to their former glory days. Even used engines are likely to cost you a pretty-penny though! Many people have realized the value and potential of 4BT Cummins engines so even abused engines are still expensive.
If you are looking for a good deal on a 4BT engine, check out our list of the 4 best places to find a 3.9L 4BT Cummins Engine for sale.
1. Craigslist
If you’re looking to find a 4BT Cummins Engine for a good price, you should go to Craigslist first. Simply search “3.9L 4BT Cummins Engine” in the search box on Craigslist.com for your area and click the search button. You’ll be given results in your local area for these motors. Be cautious though, as you can often find motors in need of serious work. This is the best option for very mechanically inclined people who plan to build their vehicle on their own.
You can often also find completed project vehicles that already have a 4BT Cummins installed. This is an easier route that will likely save you tons of time and headaches when compared to building a project vehicle from the ground-up. Check out this jeep we found.
2. Diesel Forums
Another good way to find a 4BT Cummins for sale is by posting and searching in diesel truck forums. Try focusing on ones specifically for Cummins-equipped vehicles. A lot of diesel enthusiasts have one or more projects laying around, and sometimes the one doesn’t even get finished. This is a good way to land one that might even have been modified already!
3. 4BTEngines.com
If you’re looking for a 4BT engine and you’ve had little success so far, I strongly recommend giving this company a shout. Big Bear Engine Company specializes in 4BT and 6BT Cummins engines and offer overhaul kits, used engines, and even high-quality basically new 4BT engines. They even offer a ton of knowledge on these engines for free on their blog! If you have the money to spend, this would probably be the preferred route that I recommend the most. It will also just likely be the most expensive.
4. Ebay
I’m not a huge believer in Ebay myself, but they do have a large selection of 4BT engines available for sale. This would be my last resort. Just be very cautious about buying engines here, I have not done it before my self. It’s much better to find the engine locally that way you can properly inspect it before forking over a large chunk of change.
Can’t Find a 4BT Cummins Engine for Sale?
If you can’t find a quality 4BT Cummins Engine near you, another alternative is to consider using the R2.8L Cummins Engine. While it does come with some basic emissions devices, a DOC and EGR system, it offers significantly more power than a stock 4BT with a smaller displacement.
4BT Cummins Engine FAQ
The 4BT Cummins Engine has been used in a large variety of commercial, industrial, and agricultural applications. These include bread trucks, skid steers, backhoes, and more. The 4BT is also used in marine applications. People now often swap 4BT Cummins engines into light-duty trucks, jeeps, rat rods, and classic cars.
You will want to tailor your modifications to what you will use this engine in and what it needs to do. You can increase performance by the addition of upgraded injectors, a better turbo, and other typical diesel mods.
The cost of a 4BT Cummins engines varies according to its condition. Before they were well known you could cheaply find them by purchasing old vehicles or equipment they were used in. Now people realize their value and popularity. Costs of a 4BT Cummins in bad shape can range from $1500 to around $7000-$9000 for a practically new engine.
You can purchase 4BT engines on Craigslist, Ebay, Re-manufacturers, or 4BTengines.com. Be careful as condition greatly differs engine-to-engine.
Because there are many different variations of the 4BT actual weight can vary. Most of these engines weigh between 750 and 800 lbs.
4BT Cummins engines produce 105 horsepower at 2,300 rpm and 265 lb-ft of torque at only 1,600 rpm. This is thanks to direct fuel injection and turbocharging. 4BT Cummins performance specs can be improved easily, especially in models equipped with the P-pump or P7100 injection pump.
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