[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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