Reply to "tail light lense replacment"

Many builders including pro racers use open-back air scoops connected to carbs because of the difficulty in setting carbs up for varying amounts of ram-air 'boost'. Theoretically, if the whole top of a carb is slightly pressurized by a scoop (floats, air bleeds etc), the mixture should remain constant. In reality, it seems thats not always so, but if you set things up so the carb is simply fed cool air at atmospheric pressure, the increases are predictable & engine damage is rare. I'd encourage the use of K & Ns or some sort of box over the stock Weber ram tubes. Air cleaners create a still-air space above the carb mouth and encourages the air to make its sort-of unnatural 90 degree turn down the intake. Without something like this, you can get a sort of 'eductor' effect as the passing air rushes right by the carb bell-mouths and the whole system starves. Incidently, this effect may not show up in a static dyno-run but does occur in rapidly moving vehicles.