Kinsler Air Density Gauge   

I believe the Air Density Gauge is a valuable tool for Carb tuning, 

that we very often over look, especially in Gas running.

  A gas racer starting out at 8am, with his carb tuned for best performance.

By mid afternoon due to higher air temp, the AD is considerably lower, 

 requiring the H-jet to be richened for maximum power.

The Air Density Gauge serves as a meter for Carb tuning. 

 It combines 2 factors, Air Temperature and Barometric

 Pressure and gives an accurate reading of the percentage of

 Air Density. Lower air density requires the carbs H-jet to be leaned,

 due to less oxygen per cubic foot. And  with higher AD the Carb 

should be richened, due to more oxygen per cubic foot. Moisture

or high humidity can lower AD. The carb should be slightly leaned, 

due to more moisture per cubic foot.

Continued Below

    NOTE: The maximum power output of an engine is directly related to "air density", 

provided the same fuel/air ratio is maintained. If the fuel/air ration is permitted 

to go rich or lean the reduction in power output is considerably greater. 

In addition, the ignition timing will be fast or slow and the spark plug heat range will be affected.

 To maintain a balance of these conditions and secure maximum power output at a given "air density." 

The correct fuel/air ratio must be maintained.

The Air density gauge is a requirement for serious nitro boaters. 

By noting the temp, air density, and how much adjustment was made from 

a set zero point at the carb; you can bring the performance back to peak. 

You will soon have a reference source that will allow you to set a needle with out having 

to test run the boat. 

Note: Your engine will Never Put-Out As Much Power in a lower AD environment;

 however richening the carb to compensate, will tune the engine for best performance  

with less oxygen per cubic foot. The greatest effect on AD is the elevation.

Sea level provides the highest AD, as you go higher above sea level, 

  air density drops because of less oxygen per cubic foot. 

 HP diminishes progressively at higher altitudes.

 NOTE: Richening allows more Air & less Fuel. Leaning allows less Air & more fuel.

                                     Paul Govostes  8/3/02                            Back

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