SBC Nozzles

Discussion in 'PSI Superchargers Tech Questions' started by SCO1035, Mar 31, 2009.

  1. SCO1035

    SCO1035 New Member

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    Looking for advice on the nozzle set up for my sbc. Should the 2 centre port nozzles be a little larger to compensate for the extra heat generated due to the exhaust valves being next to one another? Reading the plugs tells me they should, but if so, how much, as a rule of thumb?
    Currently has staggered nozzles front to back.
     
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  2. Alkydrag

    Alkydrag Sr. Dragster

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    I don't think anybody here can tell you what nozzles to run. And there is no rule of thumb. You need to read the plugs, egt's and bearings. Make sure they're all telling the same story. It is wise to keep a SBC on the fat side. The heads don't like to stay on when you lean on them too hard. Just do what the motor tells you it wants. One other thing, if you haven't had your system flowed, get it done.
     
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  3. SCO1035

    SCO1035 New Member

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    Not looking for numbers on the nozzles, more asking for peoples experiences in whether they have had to compensate for the increased temps in the middle two cylinders.
     
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  4. Blown Altered

    Blown Altered New Member

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    I agree with alkydrag. You need a flowed system and read your plugs. With that being said I run a small block with 23 lbs of boost and the center 2 cylinders have nozzles that are #44 and the two outer cylinders have a mix of 40's and 42's. The center cylinders do like more fuel.
     
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  5. SCO1035

    SCO1035 New Member

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    You answered my question blown altered, thank you. Oh, and l also agree with you guys on the flowed system.
     
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