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| TECH CENTER - Tech Discussion - Pressure and Flow
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TECH DISCUSSION
PRESSURE AND FLOW
PRESSURE CONVERSION FACTORS
| Kpa | Atm | In. Hg | In. H2O | PSI |
| 1.0 Kpa = | 1.0 | .00987 | .295 | 4.018 | .145 |
| 1.0 Atm= | 101.3 | 1.0 | 29.92 | 407.1 | 14.7 |
| 1.0 in Hg= | 3.386 | .03342 | 1.0 | 13.61 | .491 |
| 1.0 in H20= | .2489 | .02456 | .07349 | 1.0 | .0361 |
| 1.0 PSI = | 6.8948 | .06805 | 2.036 | 27.7 | 1.0 |
Example: You have 15 in Hg (inches of Mercury) at idle. How much is this in Kpa?
Kpa = 3.386 x 15
Kpa = 50.8
FLOW BENCH CONVERSION FACTOR
Typically flow bench values are given for a pressure drop of 28 in H2O. To convert flow figures from a different pressure drop to 28 in H2O use the formula above.
Example: You have flow figures of 152 cfm at 10 in H2O. What if the same head was flowed at 28 in H2O?
CFM = 152 x √(28÷10)
CFM = 254 cfm
Please Note: The above equations and rules apply only to four-cycle engines. The equations have been simplified for ease of understanding. Answers will be approximate but generally will be close enough for use as a guideline.
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