Quote:
Originally Posted by mechman600
How about a tank of helium? Maybe helium injection would raise the exhaust note to a higher pitch. It works when I talk after sucking on a helium balloon. The higher pitched exhaust sounds would be like getting free extra RPMs.
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Actually helium would work best as a substitute for egr. It would raise the specific heat ratio of the combustion gasses allowing more work energy to be extracted.
The following is a video of a stirling engine that has been initially charged with helium. As the helium leaks out and is replaced by ordinary air the power output drops. Of course the cost of using helium makes it totally impractical.