Home

Jetting Software

Menu

Using Relative Air Density (RAD)

Kart and motorcycle engines use a mixture of oxygen and petrol. The engine gets oxygen from air pulled in thru the venturi and the petrol through the jets. To get the best performance you need the correct Air to Fuel Ratio (AFR). When the Air Density goes up or down we need to bring the AFR back by leaning or riching the Jet.

Relative Air Density helps you understand how much oxygen is in the air. This changes based on the Relative Humidty, Air Pressure and Temperature. When the RAD is lower you need to use a smaller jet and when it increases you need to use a bigger jet.

How to use Silverapex Jetting Software

  1. Test your kart and find the ideal jetting for the current condtions to get a base line
  2. Find your nearest weather station either by using the find Me! or entering the address for the location
  3. Press Show Weather
  4. Note the RAD percentage
  5. If the RAD changes and is lower you need a smaller jet (leaner)if it is higher they you need a bigger jet (richer)
Powered by Forecast.io