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mwebb;
If I introduce more of any type of gas into an engine the compression pressure created by the stroke of the piston will increase.
The type of gas is irrelevant.
The volume, density, and temperature are relevant.
The combustibility of the combined mixture will certainly be affected by the presence of inert components, if you are talking about post combustion pressure and the resulting work created.
If the atmosphere was 100% CO2 and you were testing the compression on an engine, the reading would depend on your ambient atmospheric pressure and any throttle restriction, not on the combustibility of the gas introduced.
Not trying to be argumentative, but my understanding of EGR is that adding an inert component allows increased compression, combined with mixture dilution. This creates a greater leverage component without peak temperatures, which means more power for less fuel consumed with lower emissions.
If that knowledge is flawed (and that is certainly possible) then please enlighten me as to where the flaws exist. Always interested in learning something new, and the last mistake I will make in this life is for the hearse to go to the wrong cemetery.
regards
Mech
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