Different series 1

Riv96 has a series one engine out of a bonneville. Right off the bat i noticed that the supercharger had the ridges going all the way down the side. It definitely has the m62 that was made before mine, like the 92-93 model. I was under the impression that the 92-93 m62s had 2.55 pulleys while the 94-95 m62s had the 2.85 pulley, but his had the 2.85 pulley. I'm curious what some of you series 1 guys think? did some earlier m62s come with 2.85 pulleys?

none of the earlier ones had that pulley. That was either an older engine swapped in, or the older charger put on the "newer" series I engine. My guess is that someone found the charger in a junkyard with the pulley(2.55) already missing. (many 94-95 guys would grab the older pulley to make more boost on the newer blower) Then it got put on the engine as a "replacement" blower with the stock 94-95 pulley. That thing must push a whopping 3-4 PSI of boost with the un-coated rotors, smaller inlet bore, and larger SC pulley. Its worth noting that the older M62has a much smaller bore in the throttle body too.

Yeah i figured it was something similar to that situation too. I didn't know that the second generation m62 had a smaller inlet bore. They really improved them from the gen 2 to the gen 3. How much boost does the gen 2 m62 push? gen 3? has anyone coated the gen 2 with epoxy before?

They put out the same boost, but one does it hotter. The difference is made up with the pulley size.
Stock, you should see the same as the series 2 m90 stock. 6-7 PSI, but it also depends on temp and altitude. Also keep in mind that 7 PSI at 100 degrees will have vastly different power than 7 PSI at 150 degrees due to air density.

Very few have even tried re-coating the rotors for a m90, NM about the m62. The rotor pack would need to have the rotors separated from each other and it seems that they have problems down the road once put back together. That said, places who specialize in superchargers for boats and watercraft often have the facilities to re-coat supercharger rotors, but for a price.

Its really not at all useful to try doing anything with the gen 2 m62. These blowers don't like to suck, so all benefit from better breathing. The inlet of the gen 2 is so gimped that it has to work harder there. Even the gen 3 hits its wall for improvement pretty fast due to it just plain being a smaller blower. Really, to get the best out of a m62, good inlet porting, opening the outlet to reduce temp, and some slight custom work to get the Gen 4/5 rotors from the m62 on the Chevy cobalt into it. But only on the 94-95 casing.

Thanks Karma, good info. There is just something i like better about the m62 than the m90. I think it looks nicer in the engine bay, plus i have one ha.

.. and it whines like nothing else.

GenV M90 with 3.0" pulley or smaller ftw

.. Still not like an m62 with a 2.4" pulley and the silencer ports blocked.

Eek! Yeah.. I need vid sir. And I don't doubt. Geez... that must be nuts.