Cummins

Holset compressors for Cummins engines offer high-output performance for demanding applications. Includes QE296, QE338, SS296, SS338, and ST676 variants.

Suffixes like B and C identify the engine platform—Cummins B series or C series—and when followed by E, they indicate an E-Type unloader configuration for that engine series. Meanwhile, prefixes such as SS (Super Single), ST (Super Twin), and QT (Quiet Economy) define the compressor family before the model number. 

HD Series Description   Engine Sequence Code
HD450 Small-bore crankcase with special piston   B-Series High Mount Manifold 1-4-3-U  /Low Mount Manifold 3-4-1-L 
HD650 Small-bore crankcase   C-Series High Mount Manifold 4-3-4-3/4-3-1-3
HD850 Large-bore crankcase   N14/L10 High Mount Manifold 4-1-3-3

 

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