Re: Benefits of higher compression?.

Posted by Bob M on June 26, 2004 at 09:41:04 from (66.67.11.95):

In Reply to: Benefits of higher compression?. posted by Jonathan on June 26, 2004 at 08:32:41:

A somewhat simplified explanation:

A fundamental thermodymamic characteristic of the Otto cycle (4 stroke, spark ignition) cycle engine is this: The higher the compression ratio (CR) the higher the "expansion ratio" (the opposite of the CR) during the power stroke. The higher the expansion ratio, the more energy that is extracted from each power stoke. The more energy that's extracted, the higher the engine efficiency. And the higher the efficiency, the more power that is produced from a given engine displacement. Hence all things being equal, higher CR = higher power.

The downside is higher CR's result in higher stress on the engine (both mechanical and thermal), increased problems with detonation, ect. Simply increasing CR to increase power is not exactly a "free lunch"!

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