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Thread: IO-240B idle settings

  1. #1
    Tri4874's Avatar
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    Default IO-240B idle settings

    I need to adjust the idle setting on an IO-240B. Does anyone have any literature, maintenance manual or installation info that may help...thx
    Kitfox model 5 Vixen
    N789DF
    IO-240B

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    Default Re: IO-240B idle settings

    I have the IO-240B on my Series 5 , and guidance from Continental in SID98-10 used to be an idle RPM setting of 850 RPM preferred which I found was too high for my Kitfox if you want to land at some point. This SID is the bulletin that details the entire fuel system setup that should be done regularly. Typically I do the fuel system setup every 100 hours or if I notice any anomolies that require it done. SID 98-10 is now superceeded by SID 97-3E (you can google this and find it in PDF form ) and Continental says in this bulletin to set idle RPM to aircraft manufacturer specs. Since I am the aircraft manufacturer, I set my idle RPM to no more than 700 RPM , and with the addition of one PMag electronic ignition a few years back, I found that 600 RPM was doable after getting rid of one traditional mag. The Pmag does a much better job of firing at low RPM which a traditional mag can't handle. Hope this helps . Bruce N199CL

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    Senior Member PapuaPilot's Avatar
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    Default Re: IO-240B idle settings

    I think the best source of data for this engine is the Continental M-0 "Standard Practice Maintenance Manual'. This covers nearly everything on every Continental engine, including the procedures and settings for the IO-240 engine. The latest revision was in February this year.

    I should try a lower idle RPM too, mine is around 850.

    I confirm my full throttle static RPM metered fuel pressure at every condition inspection (it's displayed on the G3X engine screen) and have not needed to adjust anything in the last couple years.

    To adjust the fuel system you need to hook up an accurate and calibrated pressure gauge that reads to a 1/10 PSI.
    Last edited by PapuaPilot; 05-03-2021 at 06:12 AM.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

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    Default Re: IO-240B idle settings

    All of the previous comment are close, but no cigar ...

    The latest greatest is SID 97-3G and if you need to adjust idle, you really should do a fuel injection
    pressure run through.

    Here's a link to a copy of the doc:

    https://www.twincessna.org/pdf/SID97-3G.pdf

    Jeff

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    Default Re: IO-240B idle settings

    Actually if you have never done an IO-240B Fuel Pressure setup, while it's not super complicated
    it would be a good idea to get somebody who know's how and has the gauges, etc. Most any shop
    that has serviced Continentals will know how to do it.

    It's a bit tedious, because you need to go back and forth between metered, unmetered, and then set
    the idle mixture, and throttle stop. Each adjustment tends to affect the others, so it takes 2-3 iterations
    to get it right ... I've replace my fuel pump twice, and while I'm getting pretty good at it, it's still not
    the most fun thing to do.

    Jeff

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    Senior Member PapuaPilot's Avatar
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    Default Re: IO-240B idle settings

    Quote Originally Posted by n85ae View Post
    All of the previous comment are close, but no cigar ...

    The latest greatest is SID 97-3G and if you need to adjust idle, you really should do a fuel injection
    pressure run through.
    I beg to differ Jeff. While SID 97-3G works for the job in question this bulletin no longer exists. It was one of 20+ bulletins that were incorporated into the M-0 manual. Any updates to these procedures will end up in chapter 6 of the M-0 manual.
    www.continental.aero/support/maintenance-manuals.aspx

    Unfortunately this manual needs to be purchased. I don't see any differences for the IO-240 from SID97-3G, go ahead and use this document.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5 Outback, Cont. IO-240
    Flying since 2016

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    Default Re: IO-240B idle settings

    Thanks Phil

    Interesting, I just downloaded the 97-3G last fall from Continental when I replaced my Pump. Good to know about
    this manual. I see the website is password protected, any chance you could let me grab a copy of the M-O manual
    from you in pdf?

    Jeff



    Quote Originally Posted by PapuaPilot View Post
    I beg to differ Jeff. While SID 97-3G works for the job in question this bulletin no longer exists. It was one of 20+ bulletins that were incorporated into the M-0 manual. Any updates to these procedures will end up in chapter 6 of the M-0 manual.
    www.continental.aero/support/maintenance-manuals.aspx

    Unfortunately this manual needs to be purchased. I don't see any differences for the IO-240 from SID97-3G, go ahead and use this document.

  8. #8
    Tri4874's Avatar
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    Default Re: IO-240B idle settings

    Thanks to all the replies..👍
    Kitfox model 5 Vixen
    N789DF
    IO-240B

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