Tuning a carburetor-equipped engine to perform its best with the reformulated unleaded gasoline of today can prove to be a challenge for many kit car owners and builders. Back in the days of leaded ...

There's an old saying in engine tuning that when adjusting the mixture of your engine you can be too rich a bunch of times, but only too lean once. With that in mind, determining the air-fuel ratio ...

Engines need a perfect ratio of air to fuel for optimal combustion, and too much of either comes with its own set of ...