Vortex generators actually create mini tornadoes out of the inlet air between the air cleaner and intake manifold.
The idea here is to create a super high air flow that will mix air with fuel more thoroughly so that it burns more completely in the combustion chamber. The resulting turbulence, however, reduces the amount of air taken into the manifold, putting drastically less power in your hands. That’s how one of the brands recently tested cost one driver a 20% reduction in gas mileage.
There are other problems with vortex generators. One being that they don’t combine air and fuel in the first place. The fuel is not injected until it is right next to the intake of the cylinders in the engine. There are usually a couple of inches between the air intake and the fuel.
Another problem is that some of these devices are not very well made and will wind up in pieces inside your cylinders. Especially the ones you find on EBay. If there is one rule that you might want to follow, it would be not to put anything between the air intake and the engine that can come apart and be sucked into the engine.
We found that none of these devices worked in fuel injected engines. Engines equipped with carburetors are a different story. We found about a 7% increase in mileage, but the possibility of a vortex generator coming apart and pieces going inside the engine are not worth the increase in mileage.
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[...] you stuck in the air flow and it was supposed to create a vortex – seems like the same deal… Vortex Generators – Improve Your Gas Mileage @Juve – I see how you read it [...]
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