Originally Posted by RED DOG

Sharing an update of my recent experiences . . .

As many of you know I experienced a catastrophic failure when my 62mm supercharger pulley grenaded back on 08/01/14. Chunks of the grenaded pulley punched dents in my hood. After removing the pulley it was evident that the pulley face had been slipping against the face of the electromagnet on the supercharger. The face of the electromagnet was damaged and I ended up having to replace the complete supercharger unit as well as having my hood refinished. This episode lead to Chris (LateModel21) designing and producing a scatter shield to protect against flying fragments should the supercharger pulley grenade. While I was replacing my supercharger I also installed one of Rudy's new and improved intercooler units and a pair of Needswings custom high flow intake manifolds. Overall this turned out to be a VERY expensive problem for me.

My theory at the time was that the pulley began to lose its grip against the electromagnet face when nearing maximum engine RPM. The faster that supercharger is spinning the more force it takes to spin it. I believed that the demands on the supercharger from the 62mm pulley simply exceeded the ability of the electromagnet to 'hold on" to the face of the supercharger pulley.

The manufacturer of that pulley (Kang Vo who made the pulleys for Rudy and also sold directly to a few others like myself) made me a replacement pulley and and I installed it on my car a few months ago. The car would run very well around town but when pushed to the max on WOT runs, the car would "fall flat" at peak RPM and then when it would shift would be strong again until peak RPM in the next gear. Also another curious symptom was that coolant was sprayed around the right underside of the hood.

It really felt like a fuel problem OR possibly an intercooler pump problem but before going in those directions I decided to pull off that new 62mm pulley to see what it looked like. Well there was clear evidence that the new pulley had also been slipping! I managed to "catch it" before the face of the electromagnet was damaged beyond use. There was also evidence that the pulley was slipping against that special aluminum spacer washer that is used to install these pulleys. That spacer washer was chewed up with bits of shredded aluminum around the top washer and the bearing retaining C-clip.

I installed a 65mm hardened steel pulley that I bought from Jay in Poland (another of the same pulleys I've been running on my black SRT6 roadster for about 6 months without issue). All of my problems disappeared and the SSB SRT6 roadster is now running fantastic. Ready to take it to the track and get a few time slips!

In summary (and in my humble opinion), the 62mm pulley pushes the supercharger beyond the ability of the electromagnet "hold on" to the face of the pulley. I believe many of you have been running the Rudy 62mm pulley without any apparent problems. That's great for you and I certainly don't wish you any problems BUT I'm only sharing my personal experience here. I am suggesting that those of you running the 62mm pulley occasionally pull it of to check the condition of the pulley face, the face of the electromagnet AND the condition of that aluminum spacer washer. Doing so might head off more severe or catastrophic problems in the future.

Good luck and best regards,
Bob Davis (RED DOG)