MAF History

[andy quaas]

I thought that 28lb/hr sounded sorta low, but i never thought of the
duty cycle.  DUH!

Thanks for the reality check...

Andy

--- Walter Sherwin <wsherwin at idirect.com> wrote:
> 
> >> injector size= (bsfc x HP) / cylinders
> >>
> >> bsfc=.45 (normally aspirated)
> >> HP=500 (real, on the dyno HP)
> >> cylinders=8
> >> injector size=28.125
> >>
> >> for you, bsfc is .55?
> 
> 
> 
> 
> Just a couple thoughts.........your example with 
> 28.125 #/Hr injectors, and
> .45 bsfc, would wind up right on the ragged edge of
> almost being too lean
> and would require a 100% injector duty cycle which is
> not optimal if can be
> avoided.     If even one small thing goes wrong with
> your fuel system one
> day, then say good-bye to a cylinder(s).
> 
> How about targeting for 500 Hp @.5 bsfc (.6 boosted),
> and a "design"
> injector duty cycle of say 70%.  You would end up
> with 500*(.5)/.7/8 = 44.64
> #/Hr injectors.  From projects that I've seen and
> worked on in the past, I
> think you might find this more desirable.  At
> 40-50'ish #/Hr, you are still
> able to purchase/find both saturated and peak & hold
> variety injectors, to
> suit the electronics of your controller.
> 
> Have fun with your project, sounds kinda neat!
> 
> Walt.
> 
> 
> 
> 
> 
> 

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