Oct 8, 2026
Cummins Engine Models List: Every Series Explained
Every Cummins engine model explained: read any model name, compare the full series map from 3.9L to QSK60, and identify the engine you have. Free ID help.
The Cummins engine models list is easier to read than it looks. Take the name on a common industrial engine: 6BTA5.9 [3]. Six cylinders, B platform, turbocharged, aftercooled, 5.9 litres. That is the whole code — and once you can read it, names like 4BT3.9, 6CTA8.3, NTA855-C250, KTA38-M and QSK60-C2500 stop being alphabet soup.
This guide is built for the moment of recognition. It gives you the decoder first. Then it maps the full series, from the 3.9-litre B platform to the 60-litre QSK60, with the ratings we actually stock and can quote. Along the way it answers the questions hiding behind most searches for a models list: which Cummins engines have four cylinders, whether Cummins makes a gasoline engine, what the biggest Cummins engine really is, and how to identify the engine already sitting in your equipment bay.
How to Read a Cummins Model Name
Most industrial Cummins names follow one grammar:
Piece of the name | What it tells you | Example |
|---|---|---|
Leading digit | Cylinder count on B/C/L-family names | 4BT3.9 → four cylinders; 6BTA5.9 → six |
Series letter | The platform | B, C, L, N, K, M — plus Z for the 13-litre |
Displacement | Litres on most names; cubic inches on the classic big bores | B3.9 → 3.9 litres; NTA855 → 855 cubic inches (14 L) |
T | Turbocharged | 6BT vs 6B |
A | Aftercooled, air-to-air | 6BTA5.9 |
Rating code | Duty and power at rating | NTA855-C250 → construction, 250 hp; M → marine |
Q prefix | Electronically managed version of the same platform | 6BT (mechanical) vs QSB (electronic) |
Parts-market identification guides read the grammar the same way [4], [5], and the rating code is documented practice: C250 marks a construction rating at 250 hp [7]. The same convention produces KTA38-C1050 and QSK23-C760 from our own stock list. M marks a marine build, as in KTA38-M. G marks generator-drive duty.
Two displacement habits are worth catching early. Small and medium platforms state litres directly, so B3.9 is a 3.9-litre engine. The classic big bores state cubic inches — the 855 in NTA855 is 855 cubic inches, which is 14 litres. If an old plate reads KT1150, read 1150 as cubic inches, about 19 litres: the same size family we list today as K19.
That one rule reads almost every name in the range.
Mechanical or Electronic: Why Cummins Has Two Naming Systems
Two naming systems run side by side, and the difference is hardware, not marketing.
The older system is mechanical. Names like 6BT, 6CTA8.3 and NTA855 belong to the B, C, L, M, N and K platforms in mechanically governed form — fuel delivered by hardware a competent mechanic can set with hand tools. These are the engines buyers in remote operations keep asking us for: no laptop, no diagnostic software, nothing between the pump and the job.
The newer system puts a Q in front of the same platform letters. QSB, QSL, QSM, QSNT and QSK are the electronically managed versions — fuel handled by an ECU, faults reported by the electronics instead of by smoke. The letter does the talking: Q means the engine manages itself.
On-highway engines use a third convention, the IS family. ISB, ISDE and ISLE are the automotive names, and our automotive listing stocks them alongside EQB builds — 48 product pages covering everything from the 4BT3.9 up to the QSK60. The current highway flagship carries its own badge: X15, successor to the ISX [2].
Neither system is better. They answer different jobs. Our export order book leans mechanical for buyers running far from service networks — treat that as one dealer's field experience, not a specification.
Cummins Diesel Engine Sizes: The Master Series Map
Here is the list itself, in three segments: small and medium bore, heavy mechanical, and electronic high horsepower. The ratings shown are the only specifications we will print — every one of them appears on a product page of ours today, which means they are engines we can quote, test and ship. The complete range, with every model and category we list, sits on the product pages.
If you came looking for a models list with pictures: the photos live on those product pages, one per stocked build. This guide teaches the names in text on purpose, because the name on the plate outlasts any photo.
Where a layout in the tables is industry-standard rather than printed on our pages, we mark it with a star and verify it against the product pages before publish.
Small and Medium Bore: B, C and L Series
Series | Displacement | Layout* | Representative models | Typical applications | Our stock today |
|---|---|---|---|---|---|
B | 3.9 L / 5.9 L | 4-cyl (3.9) · 6-cyl (5.9) | 4BT3.9 · 6BT · 6BTA5.9 | Light construction, agriculture, pumps, small marine | In stock: 10 pages across 3.9 L, 11 across 5.9 L |
C | 8.3 L / 9.5 L | 6-cyl | 6CT · 6CTA8.3 | Construction, irrigation, industrial | In stock: 11 pages across 8.3 / 9.5 L |
L | 8.9 L / 9.5 L | 6-cyl | L8.9 · 6L · 6ZTAA13 (13 L) | Construction, g-drive, industrial | In stock: 6 pages across L8.9 / 9.5 L, plus two 13 L 6ZTAA13 |
QSB / QSL | 4.5 / 6.7 L · 8.9 L | see note* | QSB6.7 · QSL8.9 | Electronic counterparts to the B and L platforms | In stock: 8 QSB pages, 3 QSL pages |
Heavy Mechanical: N and K Series
Series | Displacement | Layout* | Representative models | Typical applications | Our stock today |
|---|---|---|---|---|---|
N | 14 L (855 ci) | 6-cyl | NT855 · NTA855 (C250–C450) | Construction & mining, pumps, g-drive, marine | In stock: 11 pages across the N855 family — NTA855 |
K | 19 / 38 / 50 L | 6 / 12 / 16* | KT19 · KTA19 (C450–C700) · KTA38 (C1050–C1400) · KTA50 | Mining trucks, heavy construction, marine, large g-drive | In stock: KTA19, KTA38, KTA50 — the KTA50 family alone spans 22 pages |
Electronic Medium and High Horsepower: QSM, QSNT, QSZ13 and QSK
Series | Displacement | Layout* | Representative models | Typical applications | Our stock today |
|---|---|---|---|---|---|
QSM / M | 11 L | 6-cyl* | M11 (C175–C330) · QSM11 (C280–C400) | Construction, marine, g-drive | In stock: 3 M11 pages, 2 QSM11 pages |
QSNT | 14 L (855 ci) | 6-cyl* | QSNT | Electronic N-series: construction, pumps, g-drive | In stock: 2 pages |
QSZ13 | 13 L | 6-cyl* | QSZ13 | Construction, g-drive | In stock: 3 pages |
QSK | 19 / 23 / 38 / 50 / 60 L | 6 to 16* | QSK19 · QSK23 (C760) · QSK38 · QSK50 · QSK60 (1,875–2,850 hp) | Mining, heavy construction, marine, large g-drive | In stock: 6 pages across the QSK range — QSK60 product page |
One reading rule for the tables: "pages" means product pages on our site, each one a separate stocked build and rating. A family that spans 22 pages is not 22 different engines; it is one platform carrying many ratings.
Which Cummins Engines Are 4-Cylinder?
Four cylinders live almost entirely in the B family, and the decoder makes them easy to spot — the leading 4 is the cylinder count:
- 4B3.9 — 3.9 litres, naturally aspirated
- 4BT3.9 — the same displacement with a turbo
- B3.3 — a smaller 3.3-litre industrial build
- QSB4.5 — the electronically managed 4.5-litre version
Where you meet them: light construction machines, irrigation and transfer pumps, small generator sets, marine auxiliaries — the steady-load end of the B platform's duties. Of these, the 3.9-litre family is what we list today: ten product pages across 4B and 4BT builds, and the 4BT3.9 also opens our automotive range. Whether B3.3 or QSB4.5 sits on our current shelf changes with our stock — ask before you plan around them.
One mix-up worth heading off: the famous 5.9-litre pickup engine is the six-cylinder 6BTA5.9, not a four. Four-cylinder Cummins engines are the 3.3, 3.9 and 4.5-litre builds above — 4BT product page.
Does Cummins Make a Gasoline Engine?
No. Cummins' engine lines run on diesel and natural gas, and that is the whole fuel story. There is no Cummins gasoline engine to add to any list.
The confusion has an understandable source. Plenty of people meet the brand through the 5.9-litre engine that made pickups famous, and pickups run on gasoline in most imaginations. That famous engine is a diesel. The natural gas side of the range shows up mainly in generator-drive builds, where gas variants of the g-drive platforms suit sites with a gas supply.
There is a practical edge to this, and it cuts in your favor: if a project specification genuinely calls for gasoline power, Cummins is the wrong brand to shortlist. We would rather tell you that in the first email than stretch a quote to fit.
The Biggest Cummins Engine (and the Ones We Do Not Sell)
At the very top of the range sits the QSK95: 95 litres, sixteen cylinders, with marine propulsion ratings of 3,200 to 4,200 hp [2]. Mining versions run in the 3,600–4,000 hp band, and the platform also powers locomotives and backup generator sets in the 3,000 kWe class [2].
On the highway side the flagship is the X15 — the Class 8 flagship and the successor to the ISX, with torque ratings above 2,050 lb-ft [2]. If you came searching for QSX15 specifications, that is this engine's earlier name, kept alive by older plates and parts listings.
Here is what most model lists will not say: the two biggest names in the Cummins range are engines we do not sell.
We do not sell either one.
QSK95 and X15 sit beyond our catalog. Our ceiling is the QSK60 — 60.2 litres, rated 1,875 to 2,850 hp QSK60 product page. Inside that ceiling — mines, marine, large g-drive — we can quote and ship with documentation. Past it, we will say so on the first call rather than round one number up.
Why print our own limit in an article meant to be found? Because a models list that implies the whole range is for sale is not a list; it is bait. You can hold the rest of our claims to the same standard — start with how to verify a genuine Cummins engine before any money moves.
Which Cummins Engine Do You Have?
So which engine is sitting in front of you? Three steps settle it in most cases.
Find the data plate. On Cummins engines it is typically located on the engine rocker cover or the side of the gear housing [1]. The plate carries the model, the serial number (ESN) and usually the rating. Photograph it — you will want that photo later anyway.
Read the name with the decoder. At this point 6BTA5.9 versus 6CTA8.3 versus QSL8.9 already tells you family, aspiration and displacement before you touch a tool.
Confirm the serial against factory records. QuickServe Online, Cummins' official lookup platform, returns the build data for the exact engine the number describes. We walk through the account, the ESN hunt and the two common errors in our QuickServe Online guide — that article teaches the tool, so this one stays on the engines.
The plate is the fast path. The block is the backup.
Plates get damaged and removed; repair forums are full of exactly that problem [6]. A missing plate does not make the engine a ghost — on many models the serial is stamped into the block itself, and the stamping cross-checks against QSOL the same way a plate does. What a missing plate does raise is the stakes of verifying the engine is what it claims to be, which is the full subject of our genuine-engine verification guide.
And if what you really wanted was a models-by-year table for your engine: no generic table can date a specific build, because ratings overlap across decades. The serial number can. That is the honest answer to the by-year question, and it runs through the same three steps.
Find Your Cummins Engine by Application
If you arrived with a job rather than a name, work backwards from the duty. The categories below mirror our product pages, so every row ends in engines we can actually quote.
Application | Series to look at | Start here |
|---|---|---|
Construction & Mining | NTA855 · KTA19 · KTA38 · KTA50 · QSK19–QSK60 | |
Marine | 6BTA5.9 · K19-M · KTA38-M | |
Pump | NTA855-P (P360–P500) · KTA19-P (P495–P680) · KTA38-P (P780–P1490) · KTA50-P (P1645–P2220) | |
G-Drive (generator sets) | G-designated builds across the stocked platforms | |
Automobile | ISB · ISDE · ISLE · EQB · 4BT3.9–QSK60 |
The Pump row is the one most people overlook: pump-drive builds are rated by pump duty (the P-numbers above), not by the construction ratings of the same platforms — an NTA855-P360 and an NTA855-C360 are configured differently even though the base engine is the same family. All four P-lines sit in our Pump category.
One more line while we are here: the marine category also carries a Weichai product line. That comparison deserves its own article, and this is not it.
Cummins Engine Models: FAQ
What Cummins engine models are there? The industrial range runs from the 3.9-litre B platform through C (8.3 L), L (8.9 / 9.5 L), N (14 L), K (19 / 38 / 50 L), M and QSM (11 L), QSNT (14 L), QSZ13 (13 L) and QSK (19–60 L) — the full map is in the three tables above. Beyond our stock, the company's range tops out with the 95-litre QSK95 and the 15-litre X15.
What does 6BTA5.9 mean? Six cylinders, B platform, turbocharged, aftercooled, 5.9 litres. The same reading gives 4BT3.9 (four cylinders, turbo, 3.9 litres) and 6CTA8.3 (six cylinders, C platform, turbo and aftercooler, 8.3 litres).
What is the difference between 6BT and QSB? The QSB is the electronically managed version of the B platform — an ECU handles fuel and reports faults, where the 6BT is mechanically governed. Same platform letters, different control hardware.
What is the biggest Cummins engine? The QSK95: 95 litres, V16, with marine propulsion ratings of 3,200 to 4,200 hp [2]. On the highway the flagship is the X15. Both sit beyond our stock, which tops out at the QSK60 rated 1,875 to 2,850 hp.
Does Cummins make a gasoline engine? No. Cummins builds diesel and natural gas engines — nothing in the lineup burns gasoline. The famous 5.9-litre pickup engine is a diesel.
Which Cummins engines are 4-cylinder? Mainly the smaller B-family builds: 4B3.9, 4BT3.9, B3.3 and the electronic QSB4.5. We currently list the 3.9-litre family (ten product pages); B3.3 and QSB4.5 availability varies with our stock, so confirm with us before you plan around them.
How do I identify my Cummins engine? Find the data plate — typically on the engine rocker cover or the side of the gear housing [1] — read the model with the decoder, then check the serial number (ESN) in QuickServe Online. No plate? The block stamping cross-checks the same way. Our QuickServe Online guide walks the lookup step by step.
What Cummins engines are used in excavators, boats and pumps? Construction and mining lean on the N855, K and QSK families. Marine work uses the 6BTA5.9 and K-series marine builds such as the KTA38-M. Pump duty uses pump-rated builds — the application table above maps each duty to its category page.
Where to Go From This List
You now hold the decoder, the map from 3.9 to 60 litres, and a way to identify an engine from its plate or its block. The list ends here; most purchases start with one specific engine.
Two ways to take that step. Send a photo of the nameplate — from your engine, or one you are about to buy — and we will read it with you and say what we see, free. Or request current pricing and availability for any model in the tables above; every rating printed here sits on a product page we can quote from today.
We are an authorized DCEC dealer based in Xiangyang, China — a dealer, not a distributor, and not the factory — so what we quote comes from stock we can document. The full range, every category, every in-stock build: cumminsmotor.com/products.