[serialk11r]

Okay I know what you mean, the flame takes longer to spread and so the fuel takes longer to burn if the chamber is flatter, so that goes to my last question again, why can't they use more spark plugs? Do they take up too much room?

lol @ above post.
@ Snaps assuming a relatively simple model for conflagration, it's probably not very hard to model the combustion chamber and figure out how to get good, complete burns. Obviously there are other problems to deal with however when thinking of designing the engine such as frictional loss, which is probably greater if you have a longer stroke and narrower bore, and of course stress on the components due to higher piston speed. I imagine gasoline burns so quickly that under many circumstances this doesn't really make a big difference.