Try operating at the same 32 " but at 2400 RPM and LOP,  and see if you
seen the periodic "shudder".  

Are your mags pressurized?   Which mags are they?   The Slicks or the
Bendix 2000 series ?

George


-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Lancair
Sent: Wednesday, June 21, 2006 11:55 AM
To: Lancair Mailing List
Subject: [LML] Re: TSIO 550 break-in

 -----Original Message-----
Sent: Wednesday, June 21, 2006 11:58 AM
Posted for Walter Atkinson <walter@advancedpilot.com>:

  You should be able to add MP to about 31.5 - 32" with great success.
That would give you about 17.5 - 18 gph in GoFAST mode and still be
adequately LOP.  Above that MP, LOP, we have noticed that soem engines
simply won;t run smothly even with exceellent F:A ratios.  We have not
identified the cause.
  
  Walter

***  Although I have limited time on my new TCM TSIO-550 I experienced
the same roughness when at 32" and leaned back.  Runs smooth for a while
and then shudders for an instant, then smooth again.  I've not
experienced that with my Lyc IO-360: it runs smooth leaned back nearly
to starvation.   ***  

Robert M. Simon,
ES-P N301ES

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