said by Bob4:
The engine was going 1000 RPM, which is 16.7 revolutions per second.
Damnit I'm really not all there in the head today. (Well I'm at work, Im sure the boss will appreciate). I had RPMs as if it was RPS while making my stupid reply.
Still though, ya I guess with the audio file you can tell by putting it on an audio file editor with that graph thing. I didnt think of that since I never listened (No speakers on my PC at work).