definition for isl etc on diesel engines

In your 13 HR, as you called it, is how you should consider it. It is a MaxxForce.

MaxxForce is made by Navistar, which is often thought of as old International.

Here is a wiki on MaxxForce, and look for one on Navistar, to see the history on Navistar and how they relate to International.

You have a Navistar Maxxforce engine.

Best,
Smitty

bumpus4 wrote:
Thanks to all for your fast reply. I think I understand it a little bit better now.

to FormerBoater: Sould I consider the engine
in my '13 HR to be manf. by Cummins or Detroit Diesel. Just wondering.

Regards, bumpus4

Navistar/International

Thanks to all for your fast reply. I think I understand it a little bit better now.

to FormerBoater: Sould I consider the engine
in my '13 HR to be manf. by Cummins or Detroit Diesel. Just wondering.

Regards, bumpus4

Engine Series

IS = Interact System (i.e. ISX, ISB)
Q/QS = Signifies that an industrial engine is electronically controlled. QS stands for QUANTUM SYSTEM CONTROLS
B = B series engine line, includes 3.3 , 3.9, 4.5 and 5.9 liter engines. Offered in both fully mechanical and electronic models. 5.9 liter engine is available in both industrial and automotive versions.
C = C series engine line, includes only 8.3 liter engines. Offered in both fully mechanical and electronic models, industrial and automotive versions available.
E = On older engine models this meant the engine was electronic. EXAMPLE: K2000E
K = K series engine line, includes 19, 23, 38, 45, 50 and 60 liter engine models.
L = L series engine line, includes older 10 liter and current 9 liter engine models. Industrial and automotive versions available.
M = M series engine line, includes M11, 11liter engines only. Industrial and automotive versions available.
N = N series engine line, no longer being produced for U.S. market. Included NTA855 and N14 engine series. Industrial and automotive versions available.
T = T series engine line such as the QST30.
X = X series engine line, includes 15 liter engines only. Industrial and automotive versions available.

I can only help with Cummins designations for their engines.

Mechanical engines were always designated by block size..B5.9, C8.3 etc. The numeric designation was displacement in liters.

Electronic controlled engines with 4 valves per cylinder (vs. 2 valves in the mechanical engines) were the successors to the mechanical engines. ISB, ISC, etc.

The first ISB's were ISB5.9...now the displacement is 6.7 liters hence the new coaches with the ISB6.7 engines.

Many new buyers of DP's only pay attention to H.P. ratings...but it is displacement that determines torque and is equally if not more important than H.P.

One other note, Cummins manufactures these engines with different H.P. ratings for different applications.

Hopefully others with chime in, but currently only Cummins and Detroit Diesel are supplying engines for the US DP motorhome market.