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Thread: 582 High EGT'S HELP

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  1. #1
    Bluebird19kf's Avatar
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    Default Re: 582 High EGT'S HELP

    I have the tiny tac and mgl which both agree on rpm. Compression checked at 130 both cylinders.

  2. #2
    Senior Member LSaupe's Avatar
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    Default Re: 582 High EGT'S HELP

    Sounds like a tough one. For the slides, it not really that they open at the same time, but where they are in relation to each other when the slide cutaway reaches the top of the throat. Usually just advance the throttle until the first one reached the top and make sure the other one gets there at the same time.

    Other things to look at if you hadnt already,

    Pulse line on your fuel pump. Make sure that it is the correct material (this is different than standard fuel line). Sometimes it can get soft and flex the tube vice the diaphragm in the pump and make the pump behave badly at times or lower its capacity.

    Pulse line length, should be as short as possible

    Pump diaphragm, these can sometimes leak enrichening the pulse side of the engine or if it pumps air into the fuel pump cause other issues.

    If you have clear carb fuel lines installed do a ground run and make sure you dont see any bubbles coming through downstream of the pump.

    You mat have already done this, but always worth swapping the carb positions to see of the problem moves with the carbs.

    Has the engine ever been through a rebuild? If so, might be work finding out more of those details. Not sure if an improperly indexed rotary valve would behave in this manner. Just odd that one EGT is higher than the other by 100F. How does it look at other throttle positions? Say from 4500 through 6500.

    Yep, float height could be a player as well, as well as needle and seat.

    You might have noticed that there was a float recall recently for those carbs. Make sure your floats are still floating fully and that you have the newest floats. I had an issue with that problem. New floats helped a great deal. Also installed new needles and seats.

  3. #3

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    Default Re: 582 High EGT'S HELP

    Have you ever tied the plane down securely and run the engine wide open to see what max static revs are ?

  4. #4
    Senior Member LSaupe's Avatar
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    Default Re: 582 High EGT'S HELP

    Here is further detail on the floats:

    A NEW Alert Service Bulletin has been issued which applies to a very limited range of 912, 914, and 2-stroke engines, as well as any engines which have been equipped with ROTAX part number 861185 floats during engine repair, maintenance or general overhaul as of May 09, 2016.

    Due to manufacturing deviations, certain 861185 carburetor floats supplied as spare parts after May 9th, 2016, and/or installed on specific serial number engines and carbs (see the ASBs for specific serial number ranges), may have the outer surface "peel" or “flake” from engine vibration.

    Serial number ranges are detailed in ASB-912-069 / ASB-914-051 (certified engines) and ASB-912-069UL / ASB-914-051UL / ASB-2ST-003 (UL engines).

    Affected floats must be replaced with current-issue 861185 floats, which are now marked with three dots for positive identification.

    http://www.rotax-owner.com/en/videos.../459-asb912069

  5. #5
    Bluebird19kf's Avatar
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    Default Re: 582 High EGT'S HELP

    I think I figured it out. I found that the choke cable on the one carb was to tight allowing it to be engaged a little. I fixed that and it appears to be way better. Egts match and do not exceed 1200 at any rpm. It is still rough at lower rpms but I believe I may be able to solve that with tunning the pilot jets and airscrews??? I'm waiting for better weather for more testing.

  6. #6
    Bluebird19kf's Avatar
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    Default Re: 582 High EGT'S HELP

    It fixed the stumbling in the midrange completely. I have it pitched now for 6200-6300 on climb out. Is that about right?

  7. #7
    Senior Member LSaupe's Avatar
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    Default Re: 582 High EGT'S HELP

    Seems a little low on climb out (maybe more like 6400-6500) though I know some who run there. Anticipate it to run rough below say around 2500 rpm. I only go below during shut down and initial start up then bring it up to 2500 to stop the gearbox chatter.

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