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Abstract The present study investigated the effects of fuel injection pressure to fuel consumption and exhaust gas emissions for the Spark Ignition (SI) engine. A series of experiments were carried out in 4-cylinders gasoline engine with capacity of 1500 cc. The default fuel injection pressure was 2.8 kg/cm 2 . In this study, the fuel injection pressures were varied from 1.4 to 4.2 kg/cm 2 . The engine speeds were retained on 800, 2000, and 3000 rpm. Fuel consumption was evaluated by using a burette under static condition and a gas analyser was used to measure exhaust gas emission. As a result, fuel injection pressure affects significantly to the fuel consumption and exhaust gas emission. The lowest fuel consumption and gas (CO and HC) emissions were reached when the injection pressure was 2 kg/cm 2 for all engine speeds. When the injection pressure indicated above and below the default engine specification, a higher fuel consumption and gas emission occurred. Therefore, a better control of the fuel injection system needs to be considered during the engine operation to reduce fuel consumption and exhaust gas emission.
Sriyanto et al. (Fri,) studied this question.