Optimum injector selection

[Bruce Bowling]

> 
> Would anyone know how to calculate the required injector flow rate required
> for a particular displacement engine?
> for example, a 4 cyl 4 stroke 600cc engine, spins up to 14,000rpm, made by
> Honda?  
> 
> 			Thanks for your help in advance!
> 						Steve Jacques
> 

Running this thru the injector sizing program (assuming a 12 Lb/hr
injector, converting 600cc to 36.6 cibic inch, and assuming a
VE of 80%):


    CID =  37 
    Volumetric Efficiency =  80% 
    Engine RPM = 14000 
    Number of cylinders =  4 
    # Injections per 2 Crank Revs =  2 
    Air/Fuel Ratio = 14.7 
    Test Injector Size (Lbs/hr) = 12 

    Computation Results:
    The Engine uses 3.241e-04 pounds of air during 2 crankshaft revolutions 
    at the given VE of  80%, per cylinder. 

    For the desired Air/Fuel Ratio of 14.7, the Injector Fire Time 
    is 3.3 milliseconds for one event (batch), 6.6 milliseconds total. 

    For an engine operating at 14000 revolutions per minute, the 
    Maximum Opportunity for Injection is 8.6 milliseconds 
    (per 2 Crank Revolutions), which yields a 77.2% Duty Cycle. 

- Bruce

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                 Bruce A. Bowling
                 Staff Scientist
   Thomas Jefferson National Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23602
                 (804) 249-7240
bowling at cebaf.gov  http://devserve.cebaf.gov/~bowling
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