Hmm? Sounds like an ignition issue.

Walter


On Jun 21, 2006, at 11:55 AM, Lancair wrote:

 -----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

--
For archives and unsub http://mail.lancaironline.net/lists/lml/