Hey guys, I'm just thinking out loud here, but hang with me, this might be hard to under stand, LOL. Most engines use a wedge shaped combustion camber like this one. Older cars used combustion chambers shaped like this one. Hemi's (Hemisperical) are used in Dodge trucks and other muscle cars like the Dodge Challenger. This combustion shape is used in formula 1 racing cars and such things like that. This is what most Hemi pistons look like. (This kind of piston is what is used in the current Dodge ram 5.7 liter hemi's.)
Ok, looking a the hemi engine, wouldn't it be more effecint to have a piston shaped "in" like a bowl? Because when I look at it, wouldn't that mean that the gases would pushed to the side of the combustion chamber, making some of the fuel/air vapor leak past the piston rings? So if the piston was bowl shaped, it would puch the gaes in to the middle of the piston, so wouldn't that give you more power? And on that note, do you like it could be possible to make a "hemi shaped" combustion chamber on a Nitro rc car? If so, would it work or would it be a waste of time? Sorry for the long post, I've been thinking about this for months and I'm just thinking out loud here, I just want to know what you guys think!