Originally posted by DemonSVT:
If you mean raising the cylinder pressure to roughly 6.8 atmospheres (14.7psi natural plus 85.3psi "forced" ) then that's your answer. 6.8 x 2.5 = 17 liters of effective displacement. Provided of course the temperature doesn't change. (100% efficient intercooler - hey this is a fantasy setup.
Uh Oh, I should have explicitly stated that all pressures are "overpressures." By 0psi pressure I mean atmospheric (not vacuum) â?? same as a tire gauge would read at sea level. Iâ??ll say overpressure from now on.
Since I had a bite on the first question, I will provide an answer.
Effective displacement is based on equal masses of air pumped.
At 60degF and atmospheric pressure ("standard conditions"), air has a density of 1.22 g/liter
At 60degF and 100psi overpressure, air has a density of 9.59 g/liter
Therefore, a contour 2.5L engine pumps 3.05 g of air for every two revolutions at atmospheric pressure.
If this engine is placed in a 100 psi overpressure environment, it will pump 23.98g of air for every two revolutions.
The size of the engine that will pump 23.98 g of air per every two revolutions at atmospheric pressure is:
23.98g / 1.22g/L = 19.7L
Thus, 19.7L is the effective displacement of a 2.5L contour engine being fed 60degF air at 100psi overpressure.
Before I get slammed, the assumption is that the engine crankshaft is rotated slowly enough that intake restrictions are not a factor.
At 60degF and 85.3psi overpressure (DemonSVT's assumption), air has a density of 7.13 g/liter giving a 14.6L effective diplacement. Actually, DemonSVT's answer is dead right if you assume that air behaves as an "ideal gas," PV=nRT.
The other questions require that you know air density as a function of pressure and temperature. The following free program will provide that data.
Uconeer 2.3: Freeware unit conversion and materials property calculator
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