Rough 2500 Rotax

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KevinC
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Joined: Fri Aug 19, 2005 12:42 am
Location: Prosser, Washington

Rough 2500 Rotax

Post by KevinC »

Finishing up 25 hr inspection today with carb sync.  One thing I haven't been able to get rid of - despite correcting other mistakes (carb sync, prop pitch out on two blades, idle mixture not set right  :oops: ) is a rough spot at ~2500 rpm.  Smooth idle at 18-2000 and smooth again at 4000-5400.  Any thoughts?

k
Dave Krall CFII SEL SES
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Location: Seattle WA

Re: Rough 2500 Rotax

Post by Dave Krall CFII SEL SES »

KevinC wrote:Finishing up 25 hr inspection today with carb sync.  One thing I haven't been able to get rid of - despite correcting other mistakes (carb sync, prop pitch out on two blades, idle mixture not set right  :oops: ) is a rough spot at ~2500 rpm.  Smooth idle at 18-2000 and smooth again at 4000-5400.  Any thoughts?

k
There's often a rough range due to prop/engine harmonics I think.
Some planes even placard it, like one of the Franklin 6 cylinder engines.
It's an RPM range that's just got to be avoided...
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alan
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Location: Baytown, TX

Post by alan »

If your prop is out of balance, there might be a certain RPM where you feel it more. Just a thought.

Alan
If I had known I would live this long I would have taken better care of myself.
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