and 'Super-Knock in Turbo-Charged Spark-Ignition Engines," International Journal of Engine Research.
According to some researchers [1, 2, 3, 4], the octane value, volatility of gasoline, intake timing, injection strategy and EGR rate have impact on the frequency of the pre-ignition
and super-knock in turbo-charged spark ignition (SI) engines".
One challenge of great importance is low speed pre-ignition
The main limit on performance increase achievable through the use of these technologies lies in the occurrence of abnormal combustion, such as pre-ignition
and engine knock .
Additionally, irregular combustion events in the full load regime such as knocking combustion and low speed pre-ignition
have been investigated in a 4-cylinder DISI production engine.
However, the occurrence of a new knock mode, which has been termed as super-knock, unwanted preignition , mega knock , low-speed pre-ignition
(LSPI) , detoknock , developing detonation , or subsequent front propagation , has become a significant obstacle for improving the power density of SI engines, especially at low-speed, high-load operating conditions.
In recent years there has been an intense effort to establish a methodology for evaluating lubricant- and fuel-related influences on the number of Low-Speed Pre-Ignition
(LSPI) events which occur in downsized turbocharged gasoline direct-injected equipment.
Figure 1 illustrates the pressure traces of a pre-ignition
and knocking combustion compared with a cycle of normal combustion.
The product is a full synthetic, high-performance engine oil that is claimed to offer quick starts even in cold temperatures and protects against LSPI (low speed pre-ignition
) that is found in newer engines.
Engine oils must pass seven new tests and offer performance that increases fuel economy and cleanliness, while mitigating the harmful effects of low speed pre-ignition
(LSPI) in modern engines.
It is designed to better protect modern turbocharged engines from Low-Speed Pre-Ignition
(LSPI), which can cause damages to vehicle engines like super knock, broken spark plugs, cracked pistons and engine failure.