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Thread: 160 Hp Tri Pacer Carb Inlet Temperature

  1. 06-11-2021, 05:53 AM #1
    wiegerket
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    Default 160 Hp Tri Pacer Carb Inlet Temperature

    Dear fellow Short Wingers,

    The Carb Inlet temperature as always considerably higher than the OAT. Brand new installed OAT and Carb Inlet Probes and new EI instrument so that is not it.
    Suspect that the "Valve" in the airbox is leaking hot air. Has anybody been able to seal this properly? Is a new airbox going to fix this?
    Are there alternative STCed airboxes on the market for the O-320 Tri Pacers?

    Thank you in advance for any help!



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  2. 06-11-2021, 06:25 AM #2
    Steve Pierce
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    Default Re: 160 Hp Tri Pacer Carb Inlet Temperature

    Have you checked the flapper valve to see if it is closing all the way? Might just be the heat from the oil sump just above the carb.
    Steve Pierce

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  3. 06-11-2021, 06:33 AM #3
    wiegerket
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    Default Re: 160 Hp Tri Pacer Carb Inlet Temperature

    Hi Steve! Thank you for the pointer. The flapper valve does touch top and bottom of the airbox in either position. The temp probe sits just above the flapper valve hinge in the air box so I am unsure that with the amount of air going through, the temperature of the oil sump may have an effect although I must say the longer the engine runs, the bigger the temp difference between OAT and Air Box.

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  4. 06-11-2021, 08:51 AM #4
    Gilbert Pierce
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    Default Re: 160 Hp Tri Pacer Carb Inlet Temperature

    I would disconnect the AirBox hot air hose from muffler shroud and see what the temperature does. That will insure you are not getting hot air from the carb heat system.
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  5. 06-12-2021, 07:59 AM #5
    Steve Pierce
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    Default Re: 160 Hp Tri Pacer Carb Inlet Temperature

    Carb air temp probe should be installed in the carburetor throat. Never seen one installed in a carb air box.
    https://www.mcico.com/Assets/product...B-5revF_im.pdf

    Carb-Temp-Probe-2.jpg
    Steve Pierce

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  6. 06-13-2021, 08:24 PM #6
    stevesaircraft(Bri)
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    Default Re: 160 Hp Tri Pacer Carb Inlet Temperature

    Quote Originally Posted by Steve Pierce View Post
    Carb air temp probe should be installed in the carburetor throat. Never seen one installed in a carb air box.
    https://www.mcico.com/Assets/product...B-5revF_im.pdf

    Carb-Temp-Probe-2.jpg
    We installed one in the AirBox and one in the throat when doing the flight testing for the Constant Speed Prop 0-360 A1P STC… FAA required a 90 degree temp rise when applying carburetor heat for de icing... took a lot to get that to happen..

    Brian


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