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More combustion confusion
Automotivebreath
The more I see you guy’s digging up on this subject the more I realize that it’s a full time job and then some. (and I am working on that story – among 500 other things).
Here are a couple of points to consider. First a high dome in a hemi creates the worst surface area to volume ratio of any combustion chamber known to man – and it’s not good. A flat top or dish works well that’s partly why those big WW2 aero engines with 20 lbs of boost made such big numbers,
Secondly (if practice follows basic theory) as the piston quench clearance tends toward zero so the ejection speed tends toward the speed of light!
Unfortunately the quench is a last opportunity to not only break up fuel droplets but also to clump them together (we will get to that later).
At this point I would like to say that you guys are looking at a very complex subject and trying to understand it is a challenge for us all. I think what we need to do here is come up with a bunch of priorities so we end up fixing or avoiding problems we can - and understanding there are some more minor things that will not be easy to fix and so time should not be unduly spent on said fixes.
Rookie - the pressure on a piston is pretty even as any pressure change travels across the piston at the local speed of sound.
Dv
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