Very interesting discussion!
I am curous as to how much mixture homogenation and fuel droplet size plays into this as it relates to pockets, wet-out, and layers in different chamber designs.
How much is bore diameter an issue (especially in lower swirl 4-valve designs)?
How much does this change from a 500+ci V8 to a small diameter shallow pent roof 4 valve chambered engine?
Are these factors more important in drag racing than in road racing engines? What about highly loaded marine performance engines?
What trends continue across all chamber designs and shapes?
How much does fuel (various gasoline types, octane, SG, and burn rates) alter this? What about methanol or ethanol fuels?
What about NA -vs- FI chambers?
Variables out the Wazoo! What ones should we be concerned with most, and why?
As for squish and quench... years ago, I took a piece of Pyrex glass and ground a chamber in it for a small bore two-stroke engine. I played with chamber shape, and squish clearance, %, and angles with it on a running engine. Very interesting, but more fun than informative until chamber pressure and crank angle could be logged. I find it interesting that many things that are common knowledge for two-stroke engine building seem to be "new" in some four-stroke circles. This may be even more true with current exhaust development, and especially the interest in square tubing.
Quote:
Originally Posted by DavidVizard-GFN
Just as a matter of interest too those on this thread I have actually got the first 4 pages of the combustion story started. One thing is for sure - it will be a monster.
DV
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Eagerly waiting, and spreading the word to others. Thanks for your time and efforts.