Port Nozzle Bodies

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by captndiet, Apr 3, 2017.

  1. captndiet

    captndiet New Member

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    Digging through my stuff I came across this set of port nozzle bodies.

    They have a square slot cut in them on each side that goes up to where the nozzle threads in.

    Not sure what they were used for ?

    Jeff
     

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  2. ozrace

    ozrace New Member

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    They are nozzles that are aerated from manifold pressure.
     
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  3. TADHemiracer

    TADHemiracer Member

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    How does the manifold pressure get into the slots? Looks to me like a slot to provide additional fuel flow. Just my thoughts.
     
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  4. tdracer

    tdracer New Member

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    How about these nozzles originally have a spring/check in them, and these slots were used to dribble a little fuel before the check opened?
     
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  5. ozrace

    ozrace New Member

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    The part of the nozzle past the threaded area is smaller than the threaded hole in the manifold and therefore exposed to manifold pressure. It feeds up into the cavity above.
     
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  6. TADHemiracer

    TADHemiracer Member

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    Identical pressure on both sides of an orifice negate each other resulting in no effect to the flow, no additional atomization.
     
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  7. TADHemiracer

    TADHemiracer Member

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    Looks to me like someone's idea that did not turn out well or these nozzles would be commercially available.
     
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  8. ozrace

    ozrace New Member

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    Then why do conventional aerated nozzles intended for use in the hat produce better atomization than non-aerated.. even when tested on a flow bench with 14.7 psi (atmospheric pressure) on both sides ?
     
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  9. Dave Koehler

    Dave Koehler Member

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    Vacuum
    Oh, you are saying visually they look better on the bench.
     
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  10. ozrace

    ozrace New Member

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    Yes Dave.. side by side with non-aerated they will show better misting.
     
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  11. Nitro Diver

    Nitro Diver Member

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    Venturi effect, the fuel flowing through the nozzle creates a vacuum pulling air in through the hole
     
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  12. ozrace

    ozrace New Member

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    We have a winner ! That's exactly what's happening Nitro Diver. You can hear the vacuum on the bench and feel it with your finger There's reduced pressure in the cavity that the fuel flows through, which is why those nozzles will work as advertised.
     
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