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Horsepower vs Injector size
Max flow vs Pressure
Injectors are a volume flow device, This means it flows a certain volume of fluid through it at whatever differential pressure you currently have over a
certain amount of time.
Example: cc/min (Cubic Centimeters per minute) or GPM (gallons per minute)
However Injectors are often talked about and displayed in pounds per hour. In Order to accurately define this you need to know the density of the fluid
you intend on flowing through them. Below is some simple math on how this is done.
First you must know the specific gravity of the fluid you will be flowing through your injector. And then you need to know how many grams are in 1
pound (453.592)
Example: 0.72 grams per cubic centimeter or 720 kilograms per cubic meter.
Now you multiply your cc/min flow rate by the specific gravity then divide it by how many grams are in one pound and multiply by 60 to convert from
minutes to hours. Here is how that would calculate out below: (1785cc/min × 0.72 ÷ 453.592) × 60 = 170.003 Pounds Per Hour
If you change to a fluid with a different density you need to do the calculation with the specific gravity of that new fluid.
Now that we know how it's calculated, here are some of the more popular fuels used in the racing industry.
170 lb/h Injectors
Power
Ethanol
Gasoline
Methanol
9
43.5 PSI fuelpressure differential (HP)
4 injectors
6 injectors
639
957
894
1341
426
639
8 injectors
1277
1788
851
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