Whats that noise?
 

So I have a new noise to my beat up motor :bomb:

I was gettin on it a bit recently, then heard this noise that sounds almost exactly like a blown power steering. But I let off and turned the wheel a few times and the noise went away. Ive found the noise only happends when I rev it. So I figure it must be something with the motor, but I have no idea what would make a power steering type of noise from just the motor?

Anyone have an idea what this might be?

Thx, Jason