Caterpillar Engine Series
1. Small Engine Series (2–4 Cylinders | 1.1L–4.4L)
Applications: Mini excavators, compact loaders, landscaping machinery, generator sets
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C1.1
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C1.5
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C1.7
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C2.2
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C2.8 (New Stage V Model)
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C3.6 (New Stage V Model)
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C4.4 (Main Engine for 320GC/313GC/315GC)
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Old Models: 3024C, 3034C, 3044C, 3054C
2. Mid-Range 6-Cylinder Main Engines (6.4L–7.2L | Most Widely Used | Including C6.4)
Applications: 20-ton class excavators, loaders and mainstream construction machinery (core product lineup)
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C6.4 ACERT (Key Model) 6.4L Inline 6-Cylinder | Fits 320D/323D/326D2
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C7 ACERT 7.2L | Fits 324D/325D/329D
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C7.1 / C7.1 ACERT 7.1L | Fits 320E/320F/323F/325F
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Old Models: 3116, 3126
3. Medium & Heavy-Duty Construction Engines (9.0L–12.5L | 6-Cylinder Heavy Load)
Applications: 330D/336D/345/349 large excavators, bulldozers, air compressors, drilling rigs
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C9 ACERT
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C9.3 / C9.3B / C9.3 ACERT
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C11 ACERT
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C13 ACERT / C13B / C13D
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Classic Old Models: 3304, 3306
4. Heavy Mining Engine Series (15L–32L | Large Excavators / Mining Trucks / Heavy Bulldozers)
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C15 ACERT
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C18 ACERT
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C27 ACERT (V12)
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C32 ACERT (V12)
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Old Models: 3406, 3408, 3412
5. Ultra-High Power Industrial / Marine / Generator Series
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3508
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3512
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3516
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C175-12 / C175-16
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C280-6 / C280-8 / C280-12 / C280-16
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CM3412 / CM3416 (Gas Generator Set)
6. Core Hot-Selling Model Summary
Hot-Selling Small Engines: C4.4
Top-Selling Mid-Range Engines: C6.4, C7.1, C7
Hot-Selling Medium & Heavy-Duty Engines: C9.3, C13
Hot-Selling Heavy-Duty Engines: C15, C18
7. Caterpillar Naming Rules (Essential for Website Building)
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Cxx.xx = Modern electronically controlled engine series
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ACERT = Caterpillar original fuel-saving and emission reduction technology
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C6.4 = Exclusive engine for 320D series with the largest market inventory
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-B / -D / -E / -F = Version upgrade marks
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-ME / -M = Marine-specific engines
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-G = Generator-specific engines