Carryfast:
Which leaves the question that most if not all military Crusaders used the …Rolls Royce Eagle not the 8v71 ?.
Edit to add.This seems to suggest that there was no connection between the military and the first design requirement for the Crusader being a civilian project from day 1.Also can’t find any confirmation anywhere of any military 8v71 orders. 
But no surprise in finding more confirmation of the durability of the 8v71 in civilian service.We can probably safely say that Scammell weren’t instructed to use the AEC V8 over the Detroit for a reason and it had nothing to do with the military. 