If using same orientation and just rotating the rotors backwards it will not work, no way to compress the air.
That Tom Morana tried something does not mean it works. Using the blower backwards is horribly inefficient. Not to mention you'd have to run it off the back side of the belt since you can't spin the blower backwards just by bolting things on opposite. You can't run a poly rib belt in a way to make the blower spin backwards. The whole idea is just silly.
No, this is air compressor related. Working with a local shop to make the M90 into a air compressor or at the very least use it to make a multistage compressor.
A top inlet and back outlet make things a lot easier, but if standard configuration is better I may still go that way.
IF Morana is doing it I may continue on my current course.
The rotors in the m90 are designed to spin the way they were indented from the factory, they actually catch and compress the air through the through the top to bottom of the unit.
Running to rotors backwards would almost be like sucking air out of the unit vs forcing air down through it.
Now if the rotors were manufactured with a reverse screw then it would not be a issue.
Manny inverted the blower upside down if I remember correctly similar to a GTP, not running the belt backwards.
What is meant by air compressor related?
IIRC, these two brothers who raced an AMC Marlin out of Denver in the 24 Hours of Lemons (Speed Holes Racing) decided a while back to attempt twin supercharging it. They used M90s because those and Toyota Previa SCs are the only ones commonly available at junkyards...
One of them sold me a 3.73 gear set for cheap (which BTW, you can bring on as a carry-on through the Denver Airport) and I recall him telling me that his brothers reversed the impellers inside the M90 SC to work for his application
I don't think it lasted very long but it was apparently glorious to behold (and was setup to run w/o the SCs if needed). According to this posting on TTAC, the setup pushed 5psi so I'm not sure if the lower than stock # was because of tuning (aka pulley diameter) or loss of efficiency.
http://www.thetruthaboutcars.com/20...ugh-amc-marlin-racer-gets-twin-superchargers/
-g
Just that, use a M90 for a compress or secondary stage instead of a piston pump. Honestly I'm only expecting 20PSI (running small HP motor ~3HP at ~8kRPM). Test motor is much bigger so we will see if/what it stalls at.
It will depend on what blower rpm he intends to spin and what CFM is required. In our application where 20psi generally requires 15-18K rpm, it would take over 100hp to generate that pressure. However, assuming CFM requirements are much lower, he may be able to underdrive the blower. If drive HP is 3hp @ 8000rpm, by turning 1/2 that rpm torque will be doubled, and so on. It all depends on cfm requirements. If cfm requirements are low enough though, the blower will end up out of it's efficiency range and may not perform well (ie. 2000rpm). They will just have to try it.Does it not take like 30 or so hp to turn this blower to get that type of pressure?