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HP / Torque Environmental Correction
By Bowling

The following performs an environmental correction to measured Horsepower(HP) values. This is extremely useful for comparison of dynamometer runs which occured at differing temperatures, etc. The idea is to convert the measured HP numbers to a "standard" environment, so that comparisons to other engines and/or other testing environments are possible and fair. There are two widely-used correction forms: the "standard" correction form (29.92 Inches Hg Barometric pressure at sea-level, 0% relative humidity, and 60 degrees F), and the SAE J1349 form (29.38 Inches Hg Barometer at sea-level, 0% relative humidity, and a test temperature of 77 degrees F).

The inputs to this program are barometric pressure (converted to sea-level, usually the form provided by Weather Services), elevation, humidity, temperature, CID, stroke, and the measured horsepower(s) with associated RPMs.

Environmental Conditions:

Carburetor Air Temperature in degrees F:

Test Condition Barometric Pressure (Inches Hg):

Test Location Elevation (Feet):

Test Condition Percent Relative Humidity:

Specific Engine Inputs:

Engine Cubic Inch Displacement (CID):

Engine Stroke in Inches:

Measured Horsepower and Associated RPM:

Enter Horsepower - RPM here. Enter up to 7 pairs - leave unused inputs blank

Horsepower: RPM:

Horsepower: RPM:

Horsepower: RPM:

Horsepower: RPM:

Horsepower: RPM:

Horsepower: RPM:

Horsepower: RPM:

Want to Compute:

     .

Bruce Bowling

Many Thanks to Mr. Bruce Bowling

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