Editing Diesel engine (section)

=== Diesel engines with a flexible crankshaft ===
Diesel engines with a flexible [[crankshaft]] refer to internal combustion engines where the [[crankshaft]] exhibits a degree of elasticity due to operational stresses, manufacturing tolerances, and material properties. Unlike a perfectly rigid [[crankshaft]], a flexible one undergoes dynamic deformations due to cyclic combustion forces, inertial loads, and lubrication effects, which can lead to eccentric motion and vibrational displacement. This flexibility can impact engine performance by influencing bearing loads, lubrication film distribution, and mechanical wear, potentially reducing efficiency and lifespan. Advanced modeling techniques, such as Finite Element Analysis (FEA) and Multi-Body Dynamics (MBD), are used to predict and mitigate these effects, enabling better engine design, improved fuel efficiency, and enhanced durability. The flexibility of a crankshaft decreases the mass flow rate of air that goes into cylinders, resulting in an unfavorable higher rate of exhaust emissions like CO.<ref>{{Cite journal |last1=Elmoselhy |first1=Salah A. M. |last2=Faris |first2=Waleed F. |last3=Rakha |first3=Hesham A. |date=2021-02-26 |title=Validated Analytical Modeling of Diesel Engines Intake Manifold with a Flexible Crankshaft |journal=Energies |language=en |volume=14 |issue=5 |pages=1287 |doi=10.3390/en14051287 |doi-access=free |issn=1996-1073|hdl=10919/102459 |hdl-access=free }}</ref>