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Well--
Glad to see we've sorted out those who might want to learn something from those who like losing to Duckworth and ricer designs !!
First of all, re diesels--a combustion chamber (or the burning air/fuel mix inside it) doesn't give two hoots whether it's located in the head or the piston crown !! In fact, good fuel atomization has another VERY good benefit, but, at least for now, the answer to what that is will be a pop quiz !!
Second---good fuel atomization is a wonderful thing, as are port induced swirl and tumble. BUT--they won't even APPROACH speeding up the burn the way properly directed , squish induced turbulence will.
Third--if you think squish induced swirl is only for pent-roof and wedge type chambers, try taking a peek at the chamber shape in the most advanced two valve true hemi chambers that presently exist--as built by folks with names like Black, Donovan, and Indy (nee Mopar). Clue: they get their shape (and their squish) via educated and effective design of the piston crown.
Recommended reading:
Glassman 'Combustion'
Obert 'The Internal Combustion Engine'
NACA --A WIDE variety of papers written by guys who tested (true hemi headed piston) engines to DESTRUCTION --because many guys lives depended depended on that last bit of performance !!!
Suggest you not refer vaguely to un-named 'engineers' when trying to debate a REAL one !!
Greg
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