Originally Posted by ExpensiveTaste
Pressure * Volume = a constant * a constant * Temperature
So if the Pressure remains the same and the volume remains the same (stock cylinder head intake ports don't change in size), then it only leaves temperature. Just saying...
Ideal gas law is only an approximation of air and isnt very applicable as temperatures and pressures change dynamicly and drastically.
Also, volume of the cylinder remains the same, but not the volume of air being forced into the cylinder.