Now I understand my mistake, I was trying to read the concept through adaptation on an existing engine which means identical capacity.
Anyway, there is more potential if you start from a diesel since this inlet valve event is happening at the beginning of the power stroke when you also inject fuel.
What's the residual pressure at the end of a standard exhaust stroke ?
And yes I did read the Wikipedia article.
The more I think about it, the least I can figure out how to squeeze induction and this ATDC spark.
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