Mohammed Kadhim Allawi, Mahmood Hasan Oudah, Mohanad Kadhim Mejbel


The exhaust manifold is a pivotal part of an internal combustion engine. The work of the exhaust manifold is
complicated and depends on many parameters viz. backpressure, velocity, the temperature of the exhaust, etc. In this
work, the performance of the exhaust manifold of a four-stroke, four-cylinder, spark-ignition engine was analysed
using three types of fuels (gasoline, methane, and methanol) to estimate flow characteristics and backpressure. The
manifold modelling is done in Fluent 18.0, followed by analysis and meshing in ANSYS software. Velocity, pressure and
temperature profiles at 1000 rpm engine speed were made. We found that methanol provided the highest exit
temperature and back pressure, whereas methane provided the lowest exit pressure. Backpressure decreased when
using gasoline fuel. Methane resulted in the best exhaust manifold performance.

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