N00b Talk: Injectors at the top of inlet?
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  1. #1
    1000+ Posts bowie's Avatar
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    Default N00b Talk: Injectors at the top of inlet?

    Evening all,

    I've seen many engines with setups like this;

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    https://youtu.be/I2B5Lkp0Au8?t=1m40s

    That is, injector and fuel rail above the throttle plate. Does this design just help with cooling the intake charge? It looks like a backfire could send atomized fuel back under the engine bay and potentially be nasty?

    Works: 1999 Volvo S40 T4, (has Choo Choo's)
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  2. #2
    1000+ Posts PeterT's Avatar
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    Yep, V8 Supercars etc. have been like that for a long time. It keeps the injector nose out of the flow and gives better atomisation, increasing efficiency considerably. As you say, if it back fires it can be catastrophic.

    '92 205 Mi16
    '90 Mi16x4

  3. #3
    1000+ Posts geckoeng's Avatar
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    A lot of high horse power motors have them as secondary injectors to cope with extra fuel after about 4500- 5000. This allows smaller injectors for smooth low RPM, where you want a wider torque curve. Also used on restricter motor like LeMans GT and F3.

    I think the one in "bowie's" video is such, as you can just see what is a fuel rail above the air box edge. ???

    Ray
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  4. #4
    1000+ Posts bowie's Avatar
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    Ah never thought of them being in place with a primary set of injectors. Makes sense.

    Yes walking around the pits at work there are increasingly interesting inlet setups.

    To control for back fire, I assume a suitable plenem would encase the setup to at least limit / absorb any misshap. But perhaps not always neccessary?

    Works: 1999 Volvo S40 T4, (has Choo Choo's)
    Playing: R12, SuperPos, thinks It's a race car.
    Previous: SuperGrumpy fuel spitting 504ti(ish), SuperComfortable 505 STI, SuperDoper carried my groceries Mi16
    Wanted Ye old K4J / K4M Click!

    "More and more of less and less" - Marina Abramović

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