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Possible engine issue while flying

  • hockeystud87
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1 week 5 days ago - 1 week 5 days ago #22793 by hockeystud87
Possible engine issue while flying was created by hockeystud87
Setup:
1994 Rotax 912 UL (Stock)
IVO IFA UL
Kitfox Model 4
70-80s outside temp

I have been experiencing a weird engine phenomenon. When I fly I have no issues when doing pattern laps engine runs strong. When I start to go into cruise and flatten the pitch a little everything seems fine. Then after a little I will get 1 sharp single pulse that will hit the plane. Seems like engine is missing, it's not loud or severe but it's a good solid hit through the plane and it's gone and back to running strong again.

It won't do it again or multiple times quickly it's just once. It doesn't do it every time either. It doesn't seem to do it when I run the engine easier (Flatter pitch same RPM). I have only had 2 instances of this.

Is this a stater issue? Gas flow?
Last edit: 1 week 5 days ago by hockeystud87.

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1 week 10 hours ago #22830 by Kevin Stewart
Replied by Kevin Stewart on topic Possible engine issue while flying
I would drop the carb float bowls and check that there is no debris being sucked up into the jet. I had this once, it looked like a piece of gasget material. After that I would check the fuel filter.

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1 week 8 hours ago #22831 by garrett
Replied by garrett on topic Possible engine issue while flying
Maybe you had some carb icing. It has happened to me a few times after a full power climb I noticed the engine was not running right after leveling off so I pulled carb heat, the engine stumbled for a second then everything was fine.
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1 week 8 hours ago #22832 by hockeystud87
Replied by hockeystud87 on topic Possible engine issue while flying
The day was pretty warm and not very humid. Carb heat would be tough. I just found out that my stater is one of the original ones that was supposed to be switched out 20 years ago. I wonder if that could be the issue? I have a replacement stater that grandpa bought that needs to get placed in.

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6 days 1 hour ago #22840 by John_in_Aus
Replied by John_in_Aus on topic Possible engine issue while flying
Carb icing can be an issue at any temp really - even up to 38c - it just depends on conditions

www.boldmethod.com/images/pages/learn-to...-potential-chart.jpg

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