Classification of Diesel Engines

By application:
Diesel engines for construction machinery
Diesel engines for agricultural machinery
Diesel engines for underground equipment
Diesel engines for vehicles
Diesel engines for forklifts
Diesel engines for compressors
Diesel engines for generator sets, welding machines, and pumps
Diesel engines for marine applications
By displacement/cylinder configuration:
Single-cylinder and multi-cylinder diesel engines
By operating cycle:
Two-stroke and four-stroke diesel engines;
Other classifications:
Vertical, horizontal, in-line, inclined, V-type, X-type, W-type, opposed-cylinder, opposed-piston, etc.;