TheMesenger:
Sorry I got sidetracked as at the time it wasn't clear that your runups were just prior to the takeoff roll.
I was in fact conducting something similar but prior to an engine performance high power run 'On the Ground'.
The orignial posters question did not clarify when the run-up was to be performed (in the air or on the ground)
For my case I will speak to the man on the headset.....
TW