Effect of Gasoline Fuel Additives on Combustion and Engine Performance

Figure 6.19: Peak heat release rate at different spark retardation angles for CI-A 
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6.3 Engine Testing 
152 
Figure 6.20: Peak heat release rate at different spark retardation angles for CI-I 
Figure 6.21: Peak heat release rate at different spark retardation angles for CI-Additional 
temperature reactions. Iverson [261] explains that such reactions provide a radical pool 
to support following high temperature reactions and dependent upon conditions, up to 
10 % of the available fuel could be consumed in the process. Should this have been 
the case in current investigations, less fuel would have been left to combust, 
subsequently resulting in lower IMEP and negligible changes to peak pressures, 
irrespective of the knock characteristics observed.
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