Wow, looks like Andrew'* (used to look anyway)
I guess those "misaligned" inlets are fairly common on the Gen III'*...

The miss alignment has been there on every M90 that I have seen to date.

Paul.. I'm confused. What leak did you find, oil? How can you possibly leak oil from a supercharger that only has a small amount of oil in the snout?

The oil on the LIM is from your PCV.

It dripped out of the PCV passages in the SC when it was tilted for removal. The rough casting causes a ledge around the lower PCV port sometimes that traps and holds some oil until titled during removal.

I always get a little oil in this manner during a removal. Especially if you break it loose, and let it sit there for a minute.

Yes there is a coating on the rotors.....or there should be.

All surfaces exposed to the airstream should be as smooth as possible.


Yes, the inlet and outlet of this machined sand casting have a lot of room for improvement.

That makes sense Bill. The oil looks fresh, like it just dumped.
The leak I was referring to Boosty is Coolant.
You can see in the following picture where it was leaking out and puddling on the LIM in the rear. It looks too close for comfort if it was leaking outwards, that it wasn't leaking inwards. :?
And yes the LIM gaskets were plastic not aluminum like the new ones I got.





Look at the difference between the Gen 3 and the Gen 5 LIM.
It gives me a wide-on just looking at it.

The LIM opening rectangle is larger on the new LIM because the GenV supercharger has a larger outlet. It'* half an inch TALLER in V than the Gen3.

In addition to the tighter tolerances on the GenV and the different coatings, the GenV'* rotors are also longer.

Is it in the mail yet Bill.

Hmm, does this explain the efficiency difference between the gen 3 and 5? Air is compressed over a longer distance equals less heat/friction?

I'm following this with great interest - someone told me that porting a gen 3 and modding the LIM can make it even better than a stock gen 5. Seeing both side by side, what are your thoughts Bill?

Paul..the coolant seepage to roughly 30mm around the coolant rings is normal to see on the gasket as some coolant leaked out of the SC/TB when you removed it from the LIM. Personally..I don't see a leak, issue or problem. What I do see is a nice clean, low mileage top end in great shape from a good maintenance schedule.

Keep it up..he'* gonna mail you an M62.. (ps.. please do keep it up. You keep increasing my chances of him sending me the Gen V... )

The inlet design is quite different as well. I"m modifying my next M62 that some really nice Goat gave me a great deal on to reflect the inlet design of the GenV, and also modifying the outlet like the GenV to an extent, with all my typical porting/polishing, then a full rebuild.

So the GenV has a more efficient inlet (Paul'* will be very much so), longer rotors, and a 'taller' less-obstructed outlet. I'll get more pics up soon. Paul'* is almost done, and will be going back to him shortly, so I need to document as much as I can before that happens.

As well...I am currently modifying a Gen 3 to nearly mirror the Gen 5 inlet to the best of my abilities.