How does piston shape effect combustion?

Striker2237

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Lewis Center Ohio, USA
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2003 Ram 1500 6.7L
I'm just a little curious how the various types of piston shapes effect combustion and resistance to detonation as well as burn efficiency. Asking because the new pistons I bought are VERY different from my stock ones and I thought they might be of a more advanced design. Thanks!

Heres my Facebook page, take a look around at the pistons and other work I have done if ya want https://www.facebook.com/Alexander.Cachapero/photos_all
 
IMO HDI is spot on as they are designed to get the best swirl/air/fuel mix for the best combustion.
 
I didn't write this but this sums it up better than i can put it

The shape of a piston has a big effect on the internal combustion process. Mainly, the shape of a piston has a lot to do with how heat and the air/fuel mixture are managed.

Pistons that are elliptical, or shaped like ovals, become more circular when heat is applied. This allows for improved sealing when the cylinder meets the combustion chamber for greater efficiency. Some pistons are tapered or conical, which lets the piston move more freely regardless of how much heat is present. Others are "barrel" shaped, which is smoother and generates less noise and harshness as it moves

Artical from http://auto.howstuffworks.com/piston-shape-affect-combustion.htm
 

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