Hmmm, 8s on 2650........ dude, don't even try that! The motor will disintegrate instantly, that's 78,000rpm! They are rated for an absolute max of 60,000rpm, that's a little more than just 'not ideal'.
Again, DO NOT ATTEMPT THIS, IT IS NOT A POSSIBILITY THAT IT WILL HAPPEN, NOR A CHANCE, IT IS AS LIKELY TO HAPPEN AS THERE IS A SUN IN THE SKY.