Specifically designed for two-stroke and four-stroke engines, the AirPro Densimeter measures key parameters such as
- Temperature
- Pressure
- Relative Humidity
- Altitude
- Air Density
The instrument displays the current weather conditions at your location, providing you with the exact reference for optimizing your engine's Jetting. Throughout the day, you can analyze changes in the weather and continuously adjust your engine's Jetting.
With the Prisma Electronics app, you can download, analyze, and export all sessions stored in the instrument to create a history of environmental data and jetting settings used on that specific track,
AIRPRO DENSIMETER - For Professional Engine Tuners
ABS Case Included
The Importance of Air Density in Engine Performance
Standard engineering charts clearly demonstrate how air temperature and barometric pressure impact engine power output. Maximum engine power is directly proportional to “air density,” provided the fuel/air ratio remains consistent. If the fuel/air ratio becomes too rich or too poor, the reduction in power output is significantly greater.
What parameters are displayed on the instrument and what do they indicate?
- BAROMETRIC PRESSURE - Showed as PRESSURE on the display - Is the local atmospheric pressure .
- HUMIDITY - Showed as rH% - Relative Humidity is the amount of moisture held by the air as a percentage of the total possible that the air could hold.
- AIR DENSITY - Showed as AIR DENS - Is the mass of the measured air per unit of volume.
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RELATIVE AIR DENSITY ( RAD ) - Showed as 97.7% in the display as example - Represents the percentage ratio of the measured air density to standard air density under reference conditions.
It provides a direct indication of air mass variation, allowing accurate correction of fuel mixture and engine tuning parameters.
- DENSITY ALTITUDE - Showed as ALT on the display - Is the altitude at which the density of the theoretical standard atmospheric condition would match the actual local air density. It not represent the actual vertical distance above mean sea level
what does air density indicate?
In technical terms, air density represents the amount of air mass present per unit of volume in a given environment. It is influenced by three main factors:
- Atmospheric Pressure: Higher atmospheric pressure compresses air molecules, increase density.
- Air Temperature: Higher Temperature expand air molecules, reducing density, while lower temperature increase it.
- relative Humidity: Humid air is less dens than air dry.
Air Density in Motorsport
Is a critical parameter because:
- It determines the amount of oxygen available for combustion in engines.
- It directly affects carburetion and the air-fuel ratio, which in turn impacts engine power.
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Download all Sessions
You can store up to 50 sessions in the instrument. In addition to reviewing the sessions directly on the device, you can download all the data to the app.
All sessions will be linked to the track where the measurements were taken. You can also add notes to each session, such as “Carburetor Tuning #1.”
You can export the sessions as PDF files, allowing you to print them or share them with your team members.
Table of contents
- What AirPro Jetting does
- Why air density affects carburation
- Before you start: how to use the AirPro Densimeter correctly
- Main screen of AirPro Jetting
- The recommended jet screen
- Exporting sessions
- AirPro Jetting settings
- Best practices for using AirPro Jetting at the track
- AirPro APP Frequently Asked Questions
What AirPro Jetting does
In two-stroke engines, carburation can change significantly throughout the day depending on atmospheric conditions. Temperature, atmospheric pressure, humidity and air density influence engine behaviour and may require changes to the carburettor main jet.
AirPro Jetting uses a wireless connection to read data from your AirPro Densimeter: temperature, atmospheric pressure, humidity, relative altitude and air density. This data is used together with the selected Rotax engine model to recommend the most suitable carburettor main jet size for the measured conditions.
The app also allows you to save each measurement as a session, add notes, associate it with the track name and export the data in PDF or CSV format.
Additionally, you can export all the data to an Excel sheet for further analysis.
