747 spark over run

[Bruce Plecan]

You can do about anything you want on the lowest KPa vs rpm column,  the
only way I've gotten there is in overrun.
   On your tale values things sound a tad off, course working *blind* here
at the moment
Bruce


> On my xfire 747 combo my idle vac is 20" and at 2600rpm cruise it's around
> 23-24.
> Since the spark table only goes to 21" and fuel 24" can I use the coolant
> compensation spark as an overrun to pull a little advance from the higher
> areas or is not a good idea? Really hate to taper tables too close to my
> cruise range.
> Other ideas alway welcome.
>
> Kevin R
>
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