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Investigation of Engine Oil Base Stock Effects on Low Speed Pre-Ignition in a Turbocharged Direct Injection SI Engine
Arthur Andrews, Raymond Burns, Richard Dougherty, Douglas Deckman, Mrugesh Patel
Investigation of Engine Oil Base Stock Effects on Low Speed Pre-Ignition in a Turbocharged Direct Injection SI Engine
Arthur Andrews, Raymond Burns, Richard Dougherty, Douglas Deckman, Mrugesh Patel
SAE International Journal of Fuels and Lubricants, Vol. 9, No. 2 (June 2016), pp. 400-407 (8 pages)
We have chosen to both present the results in a plot and (in the next section) attempt a more detailed data analysis. We plot the LSPI Frequency in Figure 3 as it varied with base stock kinematic viscosity, and mark the points by their API Group; viscosity and API group were the variables that ref [3] identified as affecting LSPI Frequency. The two highest viscosity base stocks in our design produced the most LSPI events in our experiments. Based on these two results, there appears to be a trend of increasing LSPI events with base stock viscosity (consistent with the finding of ref [3]), however there is no obvious trend with API Group (which differs from the findings of ref [3]). There also appears to be a fair amount of variance in LSPI that is not explained by the viscosity. It is worth investigating whether the variance observed in LSPI can be explained by other variables related to the base stock. In the next section we consider the data from a multivariate perspective.
With these three models we examined the data from several different perspectives. Unfortunately we found it impossible to independently measure the effect of more than a few basestock properties on LSPI events. However we find strong evidence that base stock viscosity tends to increase the number LSPI events, and base stock quality’s effect is less dramatic, and was not statistically significant in our data set