<div class="section abstract"><div class="htmlview paragraph">Otto cycle internal combustion engines have undergone technological developments
that can be fueled by various types of fuels in different mixture proportions.
To achieve this, a detailed study of the main factors that influence the engine
combustion process is necessary. The objective of this study is to evaluate the
effects of varying the ignition advance on the performance parameters and
vibration level of the engine operated with regular gasoline, premium gasoline,
ethanol and a mixture of ethanol with regular gasoline. The experimental tests
consisted of operating an Otto cycle engine on a bench dynamometer under full
load conditions, varying rotation and ignition advance by 5, 10 and 20% in
relation to the original ignition advance and correlating the levels of
pre-ignition, knock, engine vibration levels with engine performance parameters.
The results showed that the engine vibration level was influenced by the type of
fuel used, engine performance parameters and the presence of pre-ignition and
knock. The results also confirmed that fuels with a higher-octane number
supported greater ignition advances, presenting lower levels of pre-ignition,
knock and vibration in the engine. In all operating conditions, the level of
engine vibration, presence of pre-ignition and knock was higher when using
regular gasoline, followed by a mixture of ethanol and regular gasoline. This
study is relevant because it correlates the vibration level of an internal
combustion engine with the type of fuel and the engine’s combustion process.</div></div>
