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Ecological concern and accessibility of petroleum fuels have brought about interests in the search for substitute fuel for internal combustion engines. In conventional internal combustion (IC) engines, the compression ratio is fixed. One Basic problem is that drive units in the vehicles must successfully drive at varying speeds and loads and in different weather. If a diesel engine has a fixed compression ratio, a minimum value must be selected that can obtaina true self-ignition when starting the engine in cold start conditions. The combustion process in the internal combustion engine is changing cycle to cycle while changing load, speed,etc. It is difficult to obtain good fuel economy and decrease pollution emissions. Literature shows that the design of a taper, straight and lower thermal inertia exhaust manifold takes good mass conservation, fuel economy system and engine efficiency, Back pressure on engine having a powerful influence on engine efficiency and need to be decreased by using divergent shape exhaust manifold. In the experiment change the compression ratio 17, 18, 19 and also change the exhaust manifold. In this experiment engine using the pure diesel and palm biodiesel.An optimumset of Parameter find by using Taguchi method and Periodic value validation with Experiments value.

Combine Effect of Variable Compression Ratio and Diffuser at Exhaust Manifold for Single Cylinder CI Engine using Diesel and Palm Biodiesel