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Old 09-28-2008 | 10:54 AM
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Default RE: Geometric and effective compression ratio

ORIGINAL: jimiengine

HI!
WHICH IS THE DIFFERENCE BETWEEN THE GEOMETRIC AND THE EFFECTIVE COMPRESSION RATIO???

THANKS

Geometric compression ratio are measured volume between TDC and BDC + volume of compression camber.

Effective compression ratio are measured volume between TDC and from the exhaustport are closed (twostroke engine) or intake valve (4 stroke engine) are closed + volume of compression camber.

See the link: http://www.modelenginenews.org/faq/index.html#qa13
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