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Are my injectors too small?

Discussion in 'Engine Building' started by 5genracer, Feb 28, 2004.

  1. 5genracer

    5genracer Senior Member

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    I calculated my injector sizing at rc's web page and this is what I got:

    http://www.rceng.com/technical.htm#WORKSHEET

    est crank hp = 230
    number of inj = 4
    BSFC = .5
    duty cycle = .75
    fuel pressure = 40

    Using the formula it says I should use 420cc injectors. Now I am confused, as I checked around and people told me that 310cc's would be fine for my setup. What are your guys's thoughts?

    B20 84.5 mm bore
    12:1
    CTR cams
    Skunk2 intake manifold
    Possibly a 55 or 75 shot of N2O

    Thanks!
     
  2. JDMilan

    JDMilan Senior Member

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    hmm...seen variances in both.


    seen two very similar motors but one uses larger injectors for a NA application.


    I would go with the 420's.....nothing over 440 should be needed
     
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