<font size="2" face="Verdana, Arial">Your teacher's correct to a point. The idea isn't to keep the air spinning when it hit's the intake or cylinders, but instead it's supposed to spin the incoming air so that when it picks up the fuel it helps atomization as it enters the intake plenum thereby creating a better burn or more complete combustion. This is 1930's technology and if we were still running carb's this thing might have some value, but for today's engines with fuel injection being squirted directly into the intake ports it's absolutely usless and can actually have a negative effect since it would impede air flow. Today's injection systems really produce an ultra fine fuel mist unlike carb's that squirted raw fuel into the airhorn and into the path of the incoming air.Originally posted by Scottlax:
this point was brought up by my auto teacher. sure it can spin the air and allow more to flow in, but what happends when it goes into the intake manifold? just take one look at a manifold and there is no way the air could continue to "spin".