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The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
Detonation is when the air-fuel mixture in a cylinder burns too rapidly or explodes rather than burning as a controlled burn. This can be caused by too lean an air-fuel mixture, timing too advanced or compression ratio too high for the fuel being used (or too low an octane fuel for the compression ratio).ace fuel, on the other hand, at 110 to 118 octane will allow compression ratios of 14.5 to 15:1 if tuned properly. Since E-85 has an effective octane of about 110 we are doing research on what we can build using it, keeping in mind some other components will need to be changed to accommodate the use of alcohol.