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Thread: Rotax 912 Fuel Injection

  1. #1
    Registered User DarylP's Avatar
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    Rotax 912 Fuel Injection

    Hi everyone,
    I am so happy to find this site, as you all have so much going on here at Homebuilt.com, but since I am new I hope this subject has not been whipped to death.

    Is there a add-on fuel injection system for the 912ULS? I saw one on You Tube, called extreme engineering, but none of the links work.

    Daryl

  2. #2
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    Re: Rotax 912 Fuel Injection

    Rotec engineering in Australia have a new injection setup thta would be good and under $1000. All mechanical and very simple, no butterfly to restrict flow and cause icing problems,it uses a slide instead.

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    Re: Rotax 912 Fuel Injection

    Is the Rotec system certified for less than $1000. If not you can always look at Megasquirt or one of the Ford EEC-IV mods.

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    Registered User skeeter_ca's Avatar
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    Re: Rotax 912 Fuel Injection

    Should be able to use this system.

    EC3 EFI

    skeeter

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    Registered User skeeter_ca's Avatar
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    Re: Rotax 912 Fuel Injection


  6. #6
    Registered User DarylP's Avatar
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    Re: Rotax 912 Fuel Injection

    Thanks...big help guys.

    It will be interesting to see what kind of power gain will come from the conversion.

    Daryl

  7. #7
    Registered User Dan Thomas's Avatar
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    Re: Rotax 912 Fuel Injection

    Quote Originally Posted by litespeed View Post
    Rotec engineering in Australia have a new injection setup thta would be good and under $1000. All mechanical and very simple, no butterfly to restrict flow and cause icing problems,it uses a slide instead.
    Slides can ice up, too. Any restriction causes an increase in velocity, and therefore a drop in both pressure and temperature. And vaporizing fuel contributes to the cooling. Many older motorbikes had slide-throttle carbs that would freeze up and the slide would stick.

    Dan

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    Re: Rotax 912 Fuel Injection

    Yes, true about some slide setups getting iced. I was hasty in posting, The Rotec is mandatory carb heat.

    Also with the TBI-40's absence of any butterflies in the air stream the total wetted area and drag is greatly reduced, resulting in more throat area for the same size bore.
    Another advantage of the slide throttle control is that unlike the butterfly valve, the fuel mixture is not deflected into the side walls of the inlet track where the mixture tends to accumulate and loose the benefit of fuel atomizing, The Rotec TBI-40 does not deflect the mixture into the side wall and so the mixture remains freely and completely atomized.


    I


    From Rotec site http://www.rotecradialengines.com/TBI/TBI.htm
    Phil
    Last edited by litespeed; March 24th, 2010 at 05:55 AM.

  9. #9
    Registered User n2turbines's Avatar
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    Re: Rotax 912 Fuel Injection

    Airflow Performance Inc. has a mechincal fuel injection system which for the Rotax 912, currently it is flying in a Highlander ELSA ..
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    Last edited by n2turbines; April 1st, 2010 at 01:28 PM.

  10. #10
    Registered User n2turbines's Avatar
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    Re: Rotax 912 Fuel Injection

    Really the biggest problem with fuel injection on the Rotax 9XX series engines is the requirment of two electric fuel pumps ... these pumps can draw any where from 6 to 8 amps .. the Rotax onboard electrical system only produces 16 to 18 amps at full power.. so the solution should be a mechanical pump .. take a look at this site www.billetpump.com they have a mechanical pump for both carb and fuel injection ... it may be a solution.

  11. #11
    Registered User DarylP's Avatar
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    Re: Rotax 912 Fuel Injection

    Quote Originally Posted by n2turbines View Post
    Airflow Performance Inc. has a mechincal fuel injection system which for the Rotax 912, currently it is flying in a Highlander ELSA ..
    I have heard about this company, but when I try go to their website my Norton 360 flags the site with a big red X saying it is a threat to my computer. Anyone have any input on this?

    Thanks all of you for the info....

  12. #12
    Registered User n2turbines's Avatar
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    Re: Rotax 912 Fuel Injection

    Welcome to Airflow Performance, Inc. here's the website, I have Norton also and it has never flagged this site ... many RV's and RedBull Air Race aircraft use AFP systems on their IO360 and 540's

  13. #13
    Registered User DarylP's Avatar
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    Re: Rotax 912 Fuel Injection

    Quote Originally Posted by n2turbines View Post
    Welcome to Airflow Performance, Inc. here's the website, I have Norton also and it has never flagged this site ... many RV's and RedBull Air Race aircraft use AFP systems on their IO360 and 540's
    Nope...that link takes me to the Norton "reported attack site" page. That's ok, I can call them. I have had enough viruses for a while.

    Thanks

  14. #14
    Moderator autoreply's Avatar
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    Re: Rotax 912 Fuel Injection

    Quote Originally Posted by DarylP View Post
    Nope...that link takes me to the Norton "reported attack site" page. That's ok, I can call them. I have had enough viruses for a while.

    Thanks
    I presume it's not Norton, but firefox. I don't have any virus scanners (and no virusses for the last 8 years), but firefox marks it as "reported attack site". Running it in a virtual windows environment I couldn't detect any danger.

  15. #15
    Registered User Mac790's Avatar
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    Re: Rotax 912 Fuel Injection

    Just in case if someone wants to modify Rotax 912 for high altitude flights +80.000 feet, check out this TMS Hi-Alt UAV

    Seb
    Amor Patriae Nostra Lex

    "Time, training, training, training and more training is the key to any success."
    Francis "Gabby" Gabreski

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