Paul:

I don't know about your math background, but I found this neat website
which deals with all issues concerning thermodynamics.

I thought you might have some interest in it.

Here is a link to the page concerned with diesels.  You can use it to go
to other pages if you wish.

  http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatengcon.html#c2

the main link is

  http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/


George Lazik


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