Compression ratio 10:1 和 9.8:1 比较的话,那一个好和省油?
iwseeu 发表于 2010-11-26 10:39 PM 
专家说是compression ratio越高的越有力和省油。请看一下的link的解说:
A
high compression ratio is desirable because it allows an engine to
extract more mechanical energy from a given mass of air-fuel mixture due to its higher thermal efficiency. High ratios place the available oxygen and fuel molecules into a reduced space along with the adiabatic heat of compression–causing better mixing and evaporation of the fuel droplets. Thus they allow increased power at the moment of ignition and the extraction of more useful work from that power by expanding the hot gas to a greater degree.
http://en.wikipedia.org/wiki/Compression_ratio
新款车的引擎都有较高的compression ratio,除了turbo引擎例外。