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What are the Stock 1996 injectors rated at?

Discussion in 'General Viper Discussion' started by Damion Green, Nov 21, 2020.

  1. Nov 21, 2020 #1
    Damion Green

    Damion Green Enthusiast

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    just found out that injectors are typically rated at Lbs of Fuel per hour and 1Lb/Min can support 1 hp...thus I ask, what are the stock 1996 injectors rated at in Lbs/Hour?
     
  2. Jan 4, 2021 #2
    Dan Cragin

    Dan Cragin Enthusiast

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    The Gen 2 injectors PN 5245724 flow 270cc/Min at 43psi
     
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  3. Jan 5, 2021 #3
    MoparMap

    MoparMap VCA National President Venom Member

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    Dan brings up a good point, injectors are rated at a pressure, so there are potentially two ways of increasing fuel flow. One is just bigger injectors, the other is a higher pressure fuel system. Also, I'd question the full extent of that 1 lb/min = 1 hp. That math just doesn't add up. A 60 lb/hr injector is a really big one, and that would only be 1 lb/min. With 10 injectors that's only 10 hp, so something is way off there. I think it should be more like 1 lb/min = 100 hp (see this article for some more info on the calculation: https://help.summitracing.com/app/answers/detail/a_id/4807/~/what-size-injectors-do-i-need?).
     
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  4. Jan 15, 2021 #4
    Damion Green

    Damion Green Enthusiast

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    Turns out I remembered the conversion rate wrong....ooops
    turns out the conversion rate is "The Number CC"/10.5 or 25.71 Lbs/hour....hmmm the rule of thumb from the youtube guy Richard Holdner (who has appeared on Engine Masters from motortrend channel)
     
    Last edited: Jan 15, 2021
  5. Jan 16, 2021 #5
    Damion Green

    Damion Green Enthusiast

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    https://help.summitracing.com/app/answers/detail/a_id/4807/~/what-size-injectors-do-i-need?).
    according to the Summit chart the Viper injectors should be 28.25lbs/hour to support 450hp.
    The Viper stock injectors if the 260cc was correct and converted via the 10.5 number yields 26.71 lbs/hour
    that is terrible if the numbers from Summit are to be believed.

    However the number Richard gives in the video, at roughly 2hp can be supported by 1lb/hour, with the stock injector there is more than enough "head space" if Richards numbers are to be believed
    of 500hp range for a 450hp engine.

    so I will have to think about all that...maybe I did the numbers wrong
     
    Last edited: Jan 16, 2021
  6. Jan 18, 2021 #6
    MoparMap

    MoparMap VCA National President Venom Member

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    Yeah, keep in mind that you really shouldn't be using an injector at 100% duty cycle. You aren't really getting the benefit of cylinder timing or anything like that. I would imagine that you'd probably want to keep it around 80% or so max, but that's just a gut feel and something I feel like I've read before. That would line up really well with the 500 hp limit on a 450 hp engine.
     
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