Complex sentence: The logical explanation for the designation 4.236 is as follows, 4 represents 4 cylinders, 236 represents 236 cubic inch, which is the total cubic inch of the engine, this logic can be used for most of Perkins engine designations.
Split into simpler sentences: The logical explanation for the designation 4.236 is as follows, "4" represents four cylinders, "236" represents 236 cubic inches, which is the total displacement of the engine. This logic can be used for most of Perkins engine designations.