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Old 05-26-2011, 05:00 PM   #38 (permalink)
Air-Hybrid
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Quote:
Originally Posted by Dean in Milwaukee View Post
I've often wondered what sort of mpg results you could get by going sky high on compression to max out efficiency at cruise settings and just greatly retard timing for heavy throttle, ( making efficiency and max power at heavy throttle suffer) since the engine really spends very little time at heavy throttle anyway.
That's where cooled-EGR comes in.
Adding a big chunk of cEGR at FOT and high loads can hold off knock quite effectively, without the need for traditional enrichment-charge-cooling.
Clearly you are going to loose a few % of peak HP but for a much better top-end FE.
http://www.swri.org/3pubs/ttoday/Sum...n-and-Cool.pdf

Thanks to ConnClark for link

In this way max. power suffers a little but not efficiency.
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