RCU Forums - Geometric and effective compression ratio

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jimiengine

09-28-2008 10:29 AM

Geometric and effective compression ratio

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

THANKS

Motorboy

09-28-2008 10:54 AM

RE: Geometric and effective compression ratio

Quote:

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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