S!
I doubt they would run up the DB engine above idle as the manual for it states you have to wait until oil/fuel pressure exceed a certain limit. The idle RPM for DB605A-1 is 600-700rpm and in the video the RPM was not high IMO. But good points BadAim. Anyway in above videos can be clearly seen blue flames instead of yellow. I would bet the yellow would come if the mixture was way too rich or unburned fuel in the cylinders when firing up. Well, let's see..Also note that the blue flame did not light up the plane as much as in SoW video.
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