Russell Duffy wrote:

> In fact, I just realized why I run so rough on desent.  The MAP is
> probably getting pulled down below 10" and the pressure probably drops
> even more making it very lean...  hmmm  :-)
>
> I mentioned this to Tracy one day, and he said (best I understood it)
> that the engine basically isn't running under these conditions.  For
> one thing, the injector duty cycle is so low that they effectively
> aren't opening.  I've noticed times in the pattern when I was
> descending at idle, and the engine noise seemed to almost go away.
> Opening the throttle some made it start, then going to idle stop.  I
> got the distinct feeling that the engine was not running at idle, just
> like a car cuts the fuel on deceleration.  Interesting.
>
> Rusty (Maaaaaaaayby running Rev-3 by Sunday)
>
>
If you're running only premix, be careful with this situation, for
obvious reasons. Those apex seals *like* a touch of lubrication :-) Pump
people should be fine! I run premix in my daily driver rotary and set
the ECU to give .3 ms + opening time to my injectors on overrun/decel -
which is what descending at idle is, to an extreme, for a long time. Ed,
still haven't got into that attic for the SAE paper, my apologies! I'll
be up there soon.


      -Mike

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