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Date: Wed, 22 Feb 2012 13:15:44 -0500
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Throttle Back Bobble
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Chris Barber wrote:
> When I throttle back on my otherwise smooth running 13b turbo, I tend to
> get a bobble (miss?) as the engine spins down.  I don't seem to have it
> if I throttle back very slowly and smoothly, but fast moderate (usual
> manner) or quick throttle back produces it.  I have noticed this
> on Lycoming's if throttled back quickly, but obviously not an issue that
> I have noted in a regular car engine. 
> 
>  
> 
> Just curious if others have had this occur and if so why.
> 
>  
> 
> The list has been especially quite lately so come on folks, here your
> chance to shine before I start calling DAR's ;-)
> 
>  
> 
> Chris
> 
> Houston
> 

I had the same issue.  I cut the fuel and added a bunch of advance for high-rev/low-MP operations.  Cleaned it right up.