[DeTomaso] Injector & Pump Size Calculations?

[F&D Terry]

Ken,

I made close to 650 FWHP and that took 55 Lb/Hr injectors at 73 psi with 
an 80% duty cycle. This was with about 8 Lbs manifold pressure. I don't 
think your 50 Lb/Hr injectors will do it.

Your fuel pressure regulator should be connected to your intake manifold 
and in this manner manifold pressure will be compensated for. If you can 
get 60 Lb/Hr injectors at a good price, do it. There are many injector 
calculators on the internet you may try and check the results of one 
with another. Some variables will be unique to your engine. Don't 
overlook the duty cycle. Kinsler's site may have a good injector 
calculator. I have an old catalog of theirs that contains a lot of 
useful information.

Fred T.

Ken Green wrote:

>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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