That air box that Mickmini posted a pic of is not very affective for performance...it will suffer from "Re-bound Impulses"
hard to tune out
basically the weber/dellorto/solex carbs rely on the "impulses" that come from each cyls valves opening & creating a type of shock wave impulse,,,the Emulsion tubes inside the weber, rely on these shock waves to help with their emulsufiction of the air/fuel & the metering therof
so ,,,in effect, this very shallow type of air box/plenum assy do tend to stuff with the shock wave impulses by means of a 2nd & 3rd "Re-Bound" impulse caused by the back plate of the airbox/plenum thing simply being too dam close to the mouth of the carb ,,,very problematic if you wanted the thing tuned "PERFECTLY",,,I`m not saying that it won`t run,,,obviously, just that it`s very very far from being very good.
also, what tends to happen is that the air imediately around the mouth of that carbs throats is not very stable air,,,it`s in a mad rush, re-bounding off all the closed in ,narrow walls with tight corners to negotiate & therfor isn`t a very stable, avaliable or constant supply of air,,,it`s all erratic & very messy & non-controled air
2 very very YuKKy situations , & a very good example of how "NOT" to build an air box,,,especially with performance in mind,,,Much deeper would be way better, the rest of the design is pretty good,,,just way too dam shallow/narrow.
I`m sure that very same weber, with a very different deeper ,more open airbox/plenum thingy, would work far far better,,,it`s just a bit spivvy lookin isn`t it???,,,makes people thing it`s all good & all proffesional hey?,,,,, Looks can be desceiving.
just my opinion,,,what do i know?,,,sweet fark all
