Is my car worth modding??

[JohnL]

and this has plus points for the speedy delivery of the fuel to the chamber
there is one problem, being that the valve's are not always open, sooo while the fuel is still spreying everywhere and the valve is closed, where does the atomized fuel go to?

You mean the un-atomised fuel? It partially collects on the plenum and manifold walls and then dribbles into the various cylinders in uncontrolled quantities, and in different uncontrolled quantities in different cylinders. The un-atomised (or poorly atomised) fuel is also in relatively heavy droplets that in engines with a single carb are pulled this way and that with changes in air direction as the different valves open and close, but since the droplets have relatively high mass they tend to get 'left behind' by the airflow and end up not being evenly distibuted into all the cylinders.

Old straight six Holden engines were notorious for this, i.e. cylinders 1 and 6 would run rich and the others progressivly nearer the middle run lean and leaner. This happened because the heavy droplets would rush along the manifold but then fail to turn the sharp corners as they passed the openings to the middle cylinders, and more fuel ended up in the end two cylinders. This wasn't helped by the manifold passages for cylinders 3 and 4, whereby the air / fuel had to negotiate a cast-in baffle that meant the mixture had to initially travel toward each end of the manifold but just before the port openings for cylinders 2 and 5 had to make a sharp 180° turn before heading back toward cylinders 3 and 4! Needless to say cylinders 3 and 4 generally ran lean, especially at higher rpm (or what passed for high rpm with these engines), and the fuel that should have gone to cylinders 3 and 4 ended up in 1, 2, 5 and 6 (mostly in 1 and 6).

stoich is something like 1:14 fuel:air or 14.3, cant remember off hand, any more fuel then this is running it rich, and less fuel is running it lean, lean leads to pre-ignition. stoich is optimal, and very little benefit is found from runnnig too much higher then stoich.

Except under harder acceleration, a richer than stoichiometric mixture (yes, I looked up the spelling!) up to a point produces more power, but at the expense of fuel economy. When cruising you want a perfect stoichiometric ratio as you don't need max power but you do need max economy.

A stoichiometric ratio occurs when all the fuel and all the oxygen is consumed in the reaction (burning) with none left over unused. For petrol and air this ratio is roughly 14.7 X the mass (weight) of air to fuel mass. A ratio less than 14.7 of air to 1 of petrol is rich, and more than 14.7 to 1 is lean (looked those numbers up too, just to be certain you understand!).

I don't know what is considered to be the ideal ratio for a rich mixture for hard acceration, it's substantially richer but there is a point at which power starts to drop away, and I'm pretty sure this is very different for different fuels or blends.

cars like top fuel's dont run a complete combustion cycle, they're very in-efficient, because they just dump fuel into the engine like you wouldn't believe haha

Way over stoichiometric, so much that drag engines are often in danger of destroying the engine due 'hydraulicing' on fuel if something goes even a little bit wrong. Keep in mind that the brews used in drag racing are usually quite exotic and are obviously intended to be run at very rich ratios.