Quote:
Originally Posted by 71RS/SS396
Per Kurt
Here's how you calculate proper injector size to get you at 80% duty cycle;
Expected max horsepower x 1.2 x .5 for n/a ( .65 for boost) divided by the number of cylinders.
Example for 800 n/a : 800 X 1.2 = 960 X .5 = 480/8 = 60 so you would need a 60 lb/hr injector for an 800 hp n/a engine.
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For those of you (like me) that like units on their numbers (sorry, it was pounded into my head throughout my academic career) here is a good description with units of measure.
Information is from this site - -
http://www.rceng.com/technical.aspx
Selecting the Proper Injector Size
In order to select the correct size injector for your application, you might wish to use one of the following formulas.
In most cases a naturally aspirated engine will have a B.S.F.C of .50. This means that the engine will use .50 lbs. of fuel per hour for each horsepower it produces. Turbocharged engines will want to be at .60 lbs. per hour or higher.
Using these numbers as a guideline, you can select the approximate injector size in the following formula for a four cylinder, naturally aspirated engine at 200 bhp.
Most injectors will max out at 80% duty cycle and this is the accepted industry standard.
B.S.F.C is brake specific fuel consumption - How much fuel you are using per horsepower per hour
http://www.rceng.com/technical.aspx