Rotary engines are often discussed as 2 stroke engines as each rotor will have one combustion event per 360 degrees where as each cylinder in a piston engine has a combustion event per 720 degrees rotation.

For example, if the engine is not expected to reach speeds in excess of 6,000 RPMs, and if the size of the engine is 350 cubic inches, then 6,000 x 350 2,100,000. Inlet Component CFM Rating & Improvement. To find out our CFM, we need to know the volume. Multiply the engine’s highest expected revolutions per minute (RPMs) by the displacement of the engine, as measured in cubic inches. Volumetric and mass-air flow rate calculator for a 4-stroke IC engine. The piston engine will displace its engine capacity over this time however in the rotary we would have 4 combustion events occur in 720 degrees of rotation and hence the engine would displace 160 ci or twice it's nominal capacity. The airflow in your growing space needs to be strong enough to accommodate the required ACH. Loss of Pressure in Ounces per Square Inch. Velocity of Air in Feet per Second (25,000 Loss of Pressure in Ounces per Square Inch Inside Diameter of the Pipe in Inches) / Length of Pipe in Feet. CFM the turbo compressor map indicates for a. For example, to calculate BHP from motor amp draw, use the following formula. Horsepower is related to airflow and airflow is limited by the pumping capacity of a given engine displacement. If we compare a rotary engine's displacement to a piston engine then it's easiest to compare the two over 720 degrees of crank rotation as this is what a piston engine needs to complete a full engine cycle. Air Flow Equations for working out the velocity of air coming through a hose or tube and the pressure loss of the air going through these. For kitchen ventilation applications an air.

I think the thing you have perhaps missed is that the rotors turn at 1/3 of the eccentric shaft speed so you aren't actually seeing 6 combustion events occur during 360 degrees of engine rotation - This actually takes 1080 degrees or 3 full rotations. The rotary engine is a little unique but the same techniques are still applicable.

Engine cfm airflow calculator