# How do you calculate CFM from HP to RPM?

## How do you calculate CFM from HP to RPM?

If we want to calculate the CFM (Cubic Feet per Minute) for a 4 cycle motor we can multiply the cubic inch displacement of the engine by the maximum rpm (Revolutions Per Minute) and divide the result by 3456. Then we multiply the results by the volumetric efficiency of the motor.

How do you convert rpm to CFM?

Calculate the incoming volumetric air flow. If the compressor takes in 10 cubic inches of air for each revolution, then CFM input = 600 RPM x 10 cubic inches/1728 cubic inches/cubic foot = 3.47 CFM.

### How many HP is a CFM?

Air Compressor HP to CFM Calculation (rule of thumb) A rule of thumb is that each 1 HP motor size generates about 3-4 CFM of compressed air flow at about 90 PSI.

How do you calculate CFM for a blower?

CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.

#### How do you convert CFM to HP?

Conversion chart – atmosphere cubic feet / minute to horsepower – Metric

1. atmosphere cubic foot per minute to horsepower – Metric = 0.065 hp.
2. atmosphere cubic feet / minute to horsepower – Metric = 0.13 hp.
3. atmosphere cubic feet / minute to horsepower – Metric = 0.20 hp.

How do you calculate motor horsepower from CFM?

If you know how much horsepower your motor makes, you can estimate its air flow in cubic feet per minute (CFM). For example, a 1,600 cc motor in a good state of tune requires about 54 cubic feet per minute to make 78 horsepower.

## How many CFM do I need for 300 hp?

Flow(cfm @ 28 in) PowerPotential (hp)
150 308.6
200 411.4
250 514.3
300 617.1

How many cfm do I need for 300 hp?

### Can you convert HP to cfm?

The atmosphere cubic feet / minute unit number 15.38 atm cfm converts to 1 hp, one horsepower – Metric. It is the EQUAL power value of 1 horsepower – Metric but in the atmosphere cubic feet / minute power unit alternative.

What is 1 rpm?

1 min−1, 1/min. Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is the number of turns in one minute. It is a unit of rotational speed or the frequency of rotation around a fixed axis.

#### How do you calculate motor speed from rpm?

Vehicle speed = Wheels RPM * Tire diameter * π * 60 / 63360 , where: π is the circle constant; it represents the ratio between the tire’s perimeter and its diameter; 60 is the number of minutes (from “rounds per minutes”) in an hour (from “miles per hour”); and..

How to calculate CFM at 1, 200 rpm?

Calculate the CFM (volumetric flow of air) at 1,200 rpm. The volume of the column of air described in Step 2 is pi (3.1416) x fan radius squared (0.5-feet squared) times the column length in feet. This would be 3.1416 x 0.25 square feet x 800 feet = 628.32 cubic feet per minute at 1200 rpm.

## What is the formula for horsepower and air flow?

For example, a 1,600 cc motor in a good state of tune requires about 54 cubic feet per minute to make 78 horsepower. This calculator uses the formula: Air flow (CFM) = (Horsepower × 0.625) × 1.1104

How to calculate the horsepower of a motor?

If you know how much horsepower your motor makes, you can estimate its air flow in cubic feet per minute (CFM). For example, a 1,600 cc motor in a good state of tune requires about 54 cubic feet per minute to make 78 horsepower. This calculator uses the formula: Air flow (CFM) = (Horsepower × 0.625) × 1.1104

### How to calculate CFM from RPMs in a squirrel cage blower?

Centrifugal Blower Fan (Squirrel Cage-Blower) Define the terms in the general centrifugal fan formula and rearrange them to use the formula to solve for the higher air flow: CFM 1/CFM 2 = RPM 1/RPM 2 x (D1/D2)^3 (cubed). The (D1/D2)^3 is 1, since the impeller diameter stays the same, so CFM 2 = CFM 1 x (RPM 2/RPM 1).