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There is research going on with gas ICEs where they are experimenting with controlling power output through EGR volume alone. In other words, instead of choking off air to the engine they are adding EGR to control speed and power output.
EGR allows for higher effective compression with lower manifold vacuum which means you have better "leverage" during combustion which increases efficiency.
Yes, the combination of positive crankcase ventilation (PCV) and EGR means you have a tar like substance accumulating in the intake manifold. It would be nice if manufacturers would make it possible to clean those passageways without a whole lot of effort.
regards
Mech
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