Some of the troubleshooting I need to do involves bringing the engine up to 4500 RPM's to test the voltage output of some charging components. I was hoping to put my engine in a barrel of water to do this since I don't think the muffs could keep up at this RPM. However, I read in another post that you should not rev-up your engine in nuetral as it can cause damage. So my question is, if I put it in gear at that RPM won't the barrel be pushed away, or will the water blow out, etc?