[MadBill]

Originally Posted by big block fiero

This is exactly why I think some of this wet flow stuff is perplexing. For these guys to say that anything you do, to a point, to increase vaporization, do it, even if there is some loss in flow. So now a flow bench without wet flow is fairly inefective. 30 degree valve seats are out (alltho they average more flow for many applications) because 55 degree seats have more low lift vaporization due to velocity from the restriction. Any mod (other than a vaporization mod) that anyone has ever reported to be a gain is now in question because it can be said that that gain may only have been because there was somehow increased vaporization.

And so now on to your point that a super carborator that could solve all this means that the flow bench is now again significantly important, We can run 30 degree seats, valve movements as aggressive as we want, and whatever connecting rod to stroke ratio's that we want. some could even start advocating the old school polished intake ports again, (ok, maybe this is an exageration). In summary as much flow as we can find anywhere in the opperating cycle.

So then it appears that smokey was right with his hot air vaporizing engine, long connecting rods, ect, but then why is this so important now rather then back in 1984. The only difference being that smokeys vaporization occured more upstream and at 450 degrees which reduced intake air density. Joe mondello's vaporization occuring later and comparatively colder for more air density. Or is this because joe didn't even ever have a flow bench till 1997 and it took him till 2002 to reinvent the wet flow testing imageing.

David vizard has allways in the past outlined ways to increase vaporization but has generally stopped short of things that would measurably reduce cfm. perhaps his carborator mods have generally allways had more vaporization.

These clues all seem to be fitting together untill davids motor and others that Ive seen, that make more power with larger droplets are considered. The only way I can make this all fit the picture at this point is, as I surmized with darin morgan, to assume that these engines on smaller droplets have wet flow problems that create a vortecy at the plug that wets the plug. Then wile running larger droplets the vortecy changes location or mannor due to the centrifugal force within these droplets, within the vortecy, which then dosen't wet the plugs as much. An intresting test would be to run this motor with the small droplets but then try a dished valve, flat valve combination to move the vortecy somewhere else within the chamber so as to dry up the plugs. Any comments david vizard?

Matt

If anyone really wants to know if such changes are solely due to wet flow effects, all they have to do is test on propane or natural gas...