[DeTomaso] Injector & Pump Size Calculations?

Ken Green kenn_green at yahoo.com
Thu Apr 19 12:39:35 EDT 2007


Has anyone been through the exercise of sizing injectors and pumps for a super/turbo charged applications?  I came up with this:
   
  compute injector flow rate based on max HP
   
  compute fuel pressure required for candidate injector to provide fuel
   
  adjust pressure based on boost (do I just add the max boost?)
   
  check fuel pump flow rate at max pressure
   
   
   
  The design goal is 800 FWHP, and I have 50 Lb/Hr injectors (at 43.5 psi)  I need 62.5 Lbs/Hr to make 800 HP, so I need to up the pressure to 54.4 psi.  But I want to use 10 to 12 psi boost, so do I just add that to the 54.4 and get 66.4 psi?
   
  I have an Aeromotive Eliminator pump, and it will pump and the curves on the Aeromotive site show it just below 5000 Lb/Hr (62.5 X 8 injectors) at about 66 psi, so it looks like I need bigger injectors?
   
  If I look at 60 Lb/Hr injectors, I need about 57 psi at 12 pounds boost, and the pump is over 500 Lb/Hr at that pressure, so it looks OK.
   
  If anyone has real experience with this calculation, I would appreciate your comments.  I have a chance to pick up a set of 60 pound injectors for a good price, so I need to know if I should buy them.
   
  Ken



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