Hi all, new guy here. I am trying to understand the laws that govern a diesel motor. I know it compresses air at about 17 to 1 to ignite the fuel and I think that fuel will expand the air in the chamber at about 5 times the volume consistently (from tdc to end of stroke). I am trying to figure how many BTUs is used to heat the combustion stroke. Also, is the volume of liquid diesel added to the air important to the volume of the chamber (apart from igniting and expanding the air). I have tried to understand this with V1*P1/T1=V2*P2/T2, including using Kelvin and Pa, but could not make the numbers work. I hope I have phrased this properly. This is the first of a few questions to come Thanks in advance Denis D.