Quote:
Originally posted by MARKUSIUDIUS
.... AND NO YOU DONT HAVE TO KEEP A CHAMBER OF AIR BETWEEN THE FILTER AND THE CARB MOUTH, THAT WAS CRAP YOU NEVER DO THIS ON SINGLE FILTER SET UPS, TWINS, TRIPLES AND QUADS ETC, ETC.
|
It's not crap. Don't be so rude, particularly when you're not correct.
It's actually a fairly well know fact. You need to have a minimum of about two times the venturi volume in a plenum over the carb. Here's why: At throttle tip-in the engine pulls a small vaccum against the filter. If the plenum volume of air it pulls is very small, this vacuum spikes sharply and the carb dumps fuel thinking that air velocity is high (which it isn't). This causes a tip-in rich condition and an engine stumble. If there is enough air in the plenum, it buffers this effect, the plenum vaccum will be small, and the carb will meter fuel correctly.
On top of that, a large intake plenum (before and/or after the carb) buffers the turbulence caused by intake valve reversion.