A PFI gasoline SI engine is designed to operate at compression ratio 9 using
gasoline with octane number (ON) 90 (typical gasoline). Discuss the expected
problems that arise due to the increase in compression ratio to 12 (with modified
engine) while running at the same fuel. Write the possible solution to the
expected problems. Can ethanol or methanol be used on the modified engine
at a compression ratio of 12?
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