Thread: supercharger rattling at low rpm

Originally Posted by vsl67

Im going to hope everyone is right and it is the coupler but what you are describing is also the same as stuffed rotor bearings especially if its really loud at idle heres some video of mine with before I replaced the rotor block bearings

YouTube - Eaton M90 rattle

YouTube - Eaton m90 supercharger rattle no 2

Thanks for your input, I think it's a little bit different in my case. It doesn't do it in neutral and when the RPM goes a bit higher, it goes away. I ordered the coupler and the oil from ZZP a few days back, but I don't expect to receive it until a couple more days due to the holidays and the distance. I'll find out once I put in the new coupler.

Also just as a side note, I just did the dog bone flip thing on the engine and the rattling is less now, atleast 50%. It used to annoy me enough at the stoplights that I used to put it in neutral just to make it stop. Now is not loud enough to bother me.

Does anyone know if there's another purpose or effect to flipping the dog bone mounts other than preventing the engine to move so much? I only did it for this reason, but was wondering if there was something else to it.

I'll take a video of my rattling tomorrow and upload it too.