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The meaning of the Cummins model names

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Your Diesel Engine Specs

Basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque.
Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques.

Some Popular Engine Specs

What do the Cummins Engine Names 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

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Page Revision #6.2R 09-16