need answers quick..

[420aNEWB]

ok im about to order this Modern Performance Racing Products and i have a quick question im gonna buy .020 over bore because im gonna get my engine bored and the compression im supposed to buy is 8:8:1 right im gonna go the turbo route ...can some one tell me whats the compression is for... for example what is the 12:1 compression used for ?

 

[xxShaneOmac]

"Picture a cylinder with the piston at the bottom of its stroke containing 1000 cc of air. When the piston has moved up to the top of its stroke inside the cylinder, and the remaining volume inside the head or combustion chamber has been reduced to 100 cc, then the compression ratio would be proportionally described as 1000:100, or with fractional reduction, a 10:1 compression ratio.

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."

12.1:1 would make some CRAZY power, but on turbo cars you want lower compression so you can optimize boost more.

That was stolen from wiki btw.

 

[420aNEWB]

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thank you soo much im going for the 8:8:1 then 1 click away of ordering woooooooooooooooo!

 

[totaleclipse_05]

Amazing what a search can do

Next time make sure to use a better title for the thread so if someone else is wondering the same thing, they can find it easier in a search.