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Electronic carb sync device vs. vacume guage type

in 912 / 914 Technical Questions 12 years ago

  • Re: Electronic carb sync device vs. vacume guage type

    by » 12 years ago

    Al,

    I use the mechanical gauges and it takes 30 minutes, more or less. I only sync during my annual and usually adjust only one carb either up or down, depending on which way the idle speed needs to go. This year no adjustment was necessary.

    Bill.
    Thank you said by: Al C
      
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  • Re: Electronic carb sync device vs. vacume guage type

    by » 12 years ago

    Here's my personal experience on the whole carb sync business:

    1. I bought a set of analogue gauges and made a 'Rotax adapter kit' from some bits of pipe and some clips that I had lying around.

    2. I soon discovered that the analogue gauges I bought did not both read the same. i.e. if you connect both gauges together via a T-piece and apply the same vacuum to both they don't both read the same! After recalibrating them so that the matched, I continued with the sync.

    3. I normally perform a sync at every engine service or whenever I believe the carbs to be out of sync.

    4. I know that the Rotax manual advises that you make adjustments with the engine off but most people I have seen adjusting the throttle cables do so with the engine running. If you had to stop the engine each time to make an adjustment you could be there for some time.

    5. As well as synchronising the carbs you also need to set the idle speed. This involves adjusting both throttle cables and I find the whole process to be somewhat iterative.

    6. I think that for syncing purposes only I would prefer the electronic 'differential' type gauge. The analogue gauges may be better for diagnostic purposes but I have no experience of using them for this purpose.

    I hope that some of that might be of use to someone.

    Kevin
    Thank you said by: Al C
      
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  • Re: Electronic carb sync device vs. vacume guage type

    by » 12 years ago

    Thanks Kevin,

    What was/is involved in calibrating the vacuum gauges?

    Al
      
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  • Re: Electronic carb sync device vs. vacume guage type

    by » 12 years ago

    To cal the gauges I just applied the same vacuum to both via a T-piece and then adjusted the offset screw on the front of one of the gauges until they read the same at the point where I would be syncing the carbs.

    I'm sure that a more expensive set of gauges would not have required this.

    Kevin
      
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  • Re: Electronic carb sync device vs. vacume guage type

    by » 11 years ago

    I was flying 200 hours a year and replaced a bad set of carburetors after an engine problem.
    I did sync the carbs every 30 hours or so because Im a nerd. and because I can feel the slightest out of balance condition. Hey, its MY plane.
    anyway, I will try the mechanical gauges just to say I can do both, but the electronic ones are a tight balance at less than half an atmosphere. Im a nerd. I like tight balance in an airplane with me and my wife in it.
      
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