Influence of high-octane fuel blends on the performance of a two-stroke SI engine with knock-limited-compression ratio

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · SAE Special Publication

DOI:https://doi.org/10.4271/941863· OSTI ID:91230

Poola, R B ^[1]; Bhasker, T; Nagalingam, B; Gopalakrishnan, K V

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1. Argonne National Lab., IL (United States)

The use of alcohol-gasoline blends enables the favorable features of alcohols to be utilized in spark ignition (SI) engines while avoiding the shortcomings of their application as straight fuels. Eucalyptus and orange oils possess high octane values and are also good potential alternative fuels for SI engines. The high octane value of these fuels can enhance the octane value of the fuel when it is blended with low-octane gasoline. In the present work, 20 percent by volume of orange oil, eucalyptus oil, methanol and ethanol were blended separately with gasoline, and the performance, combustion and exhaust emission characteristics were evaluated at two different compression ratios. The phase separation problems arising from the alcohol-gasoline blends were minimized by adding eucalyptus oil as a cosolvent. Test results indicate that the compression ratio can be raised from 7.4 to 9 without any detrimental effect, due to the higher octane rating of the fuel blends. Knock-limited maximum brake output also increases due to extension of the knock limit. The knock limit is extended by methanol-eucalyptus-ethanol-orange oil blends, in descending order. 30 refs., 14 figs., 1 tab.

• Sponsoring Organization: USDOE
• OSTI ID: 91230
• Report Number(s): CONF-9410173--
• Journal Information: SAE Special Publication, Journal Name: SAE Special Publication Journal Issue: 1054; ISSN SAESA2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
10 SYNTHETIC FUELS
AUTOMOTIVE FUELS
COMBUSTION
COMPRESSION RATIO
GASOLINE
MIXING
OCTANE
PERFORMANCE TESTING
SPARK IGNITION ENGINES