Difference between revisions of "Compression ratio"

The compression ratio of an internal-combustion [[engine]] or external combustion engine is a value that represents the ratio of the volume of its combustion chamber; from its largest capacity to its smallest capacity. It is a fundamental specification for many common combustion engines.

Many high performance [[superbikes]] and [[sportbikes]] have higher compression ratios that require for the [[motorcyclist]] to use higher octane gasoline such as 91 or higher.