Skip to main content 

The meaning of the Cummins model names - amp

Welcome you're on our amp page explaining - the meaning of Cummins engine model names

Barrington Diesel Club for diesel engine manuals and specs

Click to
Sign up
for full Membership
Become a Member
and have access to all the manuals and specs at Barrington Diesel Club

Questions about The Cummins Big-Cam engine

Is your Cummins a
big-cam or small-cam engine?
Click to find out

The Cummins Small-Cam engine's cam-boxes
Compare the size of the
Cummins Small-Cam engine's cam-boxes
to the size of the Big-Cam engine's cam-boxes
in the following image

What do the Big-Cam engine's
cam-boxes look like?
Click to see them

Cummins Big-Cam engine's cam-boxes
Compare the size
of Cummins Big-Cam engine's
cam-boxes to the size of
the Small-Cam engine's cam-boxes
in the previous image

What is
the most recognizable feature
of the Cummins
Big Cam I and Big Cam II engines?
Click to find out

Look at the cast-aluminum oil-pan!
The cast-aluminum oil-pan
of the Big-Cam I and Big-Cam II engines
was the replaced by
a pressed-steel oil pan
for the Big-Cam III engines

What does the name
Cummins N855 BigCam mean?
Click to find out

Meaning of the name N855 BigCam

Bore of BigCam engine = 5.5 inches
Stroke of BigCam engine = 6.0 inches
Therefore displacement of one cylinder =
pi * (radius squared) * stroke =
3.14 * 2.75 * 2.75 * 6 = 142.4775 Square inches
Therefore displacement of the engine =
142.4775 * 6 = 854.865 (rounded = 855) Square inches

N = N series engines
Includes N855 and N14 engines.

So we get the N855 BigCam engine
And also the N855 SmallCam engine

What do the Cummins Engine Names mean? - amp


Cummins Engine Names. What do the mean?

A = water Aftercooled engine
as in 4BTA3.9

But AA = Air Aftercooled engine, or charge air cooling
as in 4BTAA3.9

and NA = Naturally Aspirated

B = B series engines
includes 3.3, 3.9, 4.5 and 5.9 liter engines.
both fully mechanical and electronic models.
industrial and automotive versions.

C = C series engines Only 8.3 liter engines. both fully mechanical and electronic models. industrial and automotive versions.

E = electronic engines. Older engine model designation meaning the engine is electronic. e.g. K2000E

I and IS
I/IS = Automotive engines that are electronically controlled.

IS = Interact System (e.g. ISX, ISB, ISL) Interact System meaning that the engine is capable of interacting with the transmission and other electronically controlled devices in the truck or bus.

K = K series engines Includes 19, 23, 38, 45, 50 and 60 liter engine models.

L = L series engines Includes older 10 liter and current 9 liter engine models. industrial and automotive versions.

M = M series 11 liter engines Industrial and automotive versions.

N = N series engines Includes N855 and N14 engines. Still Available from Cummins China and other countries but no longer produced for U.S., Japanese and Euro markets.

Q and QS
Industrial engines that are electronically controlled.

T = T series engines The T in electronic engine names is part of the actual engine model e.g. the QST30.

However in mechanically controlled engines
The T = Turbo e.g. 6BT

X = X series engines Only 15 liter engines.
Industrial and automotive versions available.

A couple of examples:
6CTA = 6 cylinder, 8.3 liter, turbocharged, aftercooled engine
ISM11 = automotive, electronic interact system, 11 liter engine
ISX15 = automotive, electronic interact system, 15 liter engine
QSX15 = industrial, electronic, 15 liter engine

Other Engine Terms:
Numbers Before
If a number comes first in the engine name it indicates the number of cylinders. e.g. 6BT = 6 cylinders, 4BT = 4 cylinders.

Numbers After
If a number comes last in the engine name e.g. the 3.9 in the model 4BTA3.9 the 3.9 = the displacement in liters

Inter Club Navigation
Click for:
Info on
basic engine specs
Basic specs are free
 and open to everyone

They usually include
engine images, displacement, 
dimensions and weight, 
essential bolt tightening torques, 
characteristics of the engine 
e.g. its power and torque. 

Essential bolt torques are:
 main bearing cap bolts 
 connecting rod cap bolts
cylinder head bolt torques

 Home Page   Membership   Contact Us      Club Matters   Engine List   Technical  Videos 
Click for:
Info on
manuals and books

Get club membership for
engine manuals or parts books.

Subscribe for Membership 
if you need manuals 
on a continuous basis


Take a one week window
 if you only need manuals 
 for a specific engine.

Click for: Cummins engine specs   Click for: CAT Diesel engine Specs   Click for: Detroit Diesel specs   Click for: ADE diesel engine specs   Click for: Deutz diesel engine specs

More Diesel Engine Specs, Bolt torques and manuals

Click for Index to More Diesel Engine Manuals, bolt torques, specs
Click for More Cummins engine manuals, bolt torques, specs

 Membership - Sign Up  More about Membership  Login 
Home Page 
  Home - Desktop    Home - Mobile 
Engine List 
  Engine List - Desktop    Engine List - Mobile 
Club Matters
More About Us  Terms and Conditions  Acknowledgements  Site Map  Privacy Policy 

Page Revision #9.1RS AMP 05-20