Effect of Gasoline Composition on Engine Performance 930375
In order to clarify the effect of each gasoline component on engine performance during warm-up, changes in the air-fuel ratio and quantity of wall flow (liquid gasoline on the induction port) were measured using ordinary gasolines and model gasolines consisting of a blend of several hydrocarbons and MTBE (methyl-tertiary-butyl-ether). The unburned air-fuel mixture in a combustion chamber was sampled via a solenoid valve and analyzed by gas chromatography to investigate the vaporization rate of each component. The results show that MTBE has an important effect on driveability because it contains oxygen and easily vaporizes, resulting in a lean mixture in the transient state. The popular driveability index, T50 (50% distillation temperature), does not provide an adequate means of evaluating MTBE-blended gasoline. Heavy aromatics (C9+ aromatics) also have a significant effect on driveability because they tend to increase the wall flow quantity and promote the formation of a lean air-fuel mixture. Based on the results of this study, a new driveability index was devised for formulating automotive gasoline.
Citation: Oda, K., Hosono, K., Isoda, T., Aihara, H. et al., "Effect of Gasoline Composition on Engine Performance," SAE Technical Paper 930375, 1993, https://doi.org/10.4271/930375. Download Citation
Also in:
New Developments in Alternative Fuels and Gasolines for SI and Ci Engines-SP-0958, SAE 1993 Transactions: Journal of Fuels & Lubricants-V102-4
Related Topics:
Combustion chambers
Air / fuel ratio
Gasoline
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