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Originally Posted by cmac2012
If you deposited a cylinder full of air in a 617 and it was say, twice normal atmospheric pressure but had been cooled down to ambient temperature -- would that quantity of air yield the same or greater temperature after being compressed by a merciless piston as would a cylinder full of air at the same temp but at normal atmospheric pressure?
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The change in absolute pressure in the case of a standard 617 is 21:1. The air is compressed to a volume that is 1/21 of the original volume. The temperature goes up accordingly.
In the case of this hypothetical 617, the change in absolute pressure is the same 21:1. The final pressure in the cylinder would be 609 psi, which would have blown the head right off the engine. However, if it remained intact, the change in pressure remains at 21:1. So, the temperature rise would be the same as the standard 617 if they both started at the same temperature.