Static Compression Ratio

OK all these while I have been talking about this compression ratio (CR) thingy.  What is it actually?  In simple words, it is just the ratio between the Volume of the Combustion Chamber when the piston is at the bottom-most of its travel (Bottom Dead Center = BDC) divided by the Volume of the Combustion Chamber when the piston is at the top-most of its travel (Top Dead Center = TDC).  It's a direct effect of the combination of several components of the engine internals, and there are physics and mathematical calculations to measure these CR.

Sounds complicated?  If you're "smart" like me, then don't trouble your brain to study the formulas, dimensions and thermodynamics of all the mechanical stuffs in the engine to calculate your static CR.  There are many readily available online calculators nowadays.  Just pick one (or several) of those calculators, key in the necessary numbers, and it's calculate the CR right away.  All these calculators are estimates though, but it's good enough to make a quick check to see whether you have the good recipe for power, or heading for destruction.

I often use this calculator by Zeal Autowerks for my calculation.  So far it is the most accurate one there is.  It also has the customized calculator for B-Series.  Here's a sample calculation of the static CR of the engine that I am building now:

If you insist on studying the mathematical calculations behind calculator like these, I recommend you to read it here.